Pest Management Guide for Grapes in Washington - 2018 WASHINGTON STATE UNIVERSITY EXTENSION EB0762
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2018
Pest Management
Guide for Grapes
in Washington
W A S H I N G T O N S TAT E U N I V E R S I T Y E X T E N S I O N • E B 0 7 6 2
EB0762 Pest Management Guide for
Grapes in Washington—2018
POISON EMERGENCY Washington Poison Center: 1-800-222-1222
For further information, see Pesticide Safety
PESTICIDE LABELS YOU ARE REQUIRED BY LAW TO FOLLOW THE LABEL. It is a legal
document. Always read the label before using any pesticide. You,
the grower, are responsible for safe pesticide use.
Trade Names Trade (brand) names are provided for your reference only. No
discrimination is intended, and other pesticides with the same
active ingredient, provided they are also registered for use on
the intended crop and for the intended target, may be suitable.
No endorsement is implied.
Pesticide Information National Pesticide Information Center 1-800-858-7378
Spray Guide Coordinators Gwen Hoheisel, Regional Extension Specialist
Michelle Moyer, WSU Extension Viticulturist
Front Cover Photos Michelle Moyer, WSU Extension Viticulturist
SECTION COORDINATORS:
Regulations & Safety Catherine Daniels, WSU Pesticide Coordinator
Weeds Lynn Sosnoskie, WSU Extension Weed Specialist
Tim Miller, WSU Extension Weed Specialist
Insects Douglas Walsh, WSU Extension Environmental and
Agrichemical Education Specialist
Gwen Hoheisel, Regional Extension Specialist
Nematodes Inga Zasada, USDA-ARS Research Plant Pathologist
Plant Diseases Michelle Moyer, WSU Extension Viticulturist
Naidu Rayapati, WSU Extension Grape Virologist
Prepared by representatives of Washington State University, WSDA and USDA personnel,
and industry representatives.
WSU Extension • Washington State University • Pullman, WashingtonCONTENTS
General Information........................................... 1 Pest Management Program for
Grapevines.................................................... 25
Pesticide Safety.................................................... 1
Precautions for Use and Storage Diseases of Grapevines...................................... 30
Pesticide Disposal Trunk and Root Diseases
Symptoms of Poisoning Foliar and Fruit Diseases
Emergency Treatment
Reporting Poisonings and Pesticide Accidents Disease Management Program for
Grapevines.................................................... 36
Weed Control...................................................... 5
Application Rate and Equipment Viruses of Grapevines....................................... 45
General Precautions Management of Grapevine Virus Diseases
Factors Affecting Control Grapevine Leafroll Disease
Soil-Applied Herbicides Rugose Wood Complex (Grafted Vines)
Foliar-Applied Herbicides Grapevine Fanleaf and Grapevine Decline
Diseases
Herbicide Injury................................................ 15 Grapevine Red Blotch Disease
2,4-D Drift Documentation Potential Virus Diseases
Weed Management Program Spray Recommendations ................................. 49
for Grapevines............................................... 16 General
Formulations
Pests of Grapevines........................................... 18 Calibration of Vineyard Sprayers
Black Vine Weevil Dilutions
Brown Marmorated Stink Bug
Cutworms Regulatory Information................................... 52
Drosophilla suzukii Pesticide Residues on Grapes
Grape Flea Beetle Pesticide Restricted Entry Standards
Grape Leaffolder Licensing
Grape Mealybug Chemigation
Grape Phylloxera State Laws and Regulations
Leafhoppers Worker Right-To-Know Act
Mites Horticulture Pest and Disease Boards
Plant-Parasitic Nematodes Tank Mixes
Scale Insects
ThripsGENERAL INFORMATION
The Pest Management Guide for Grapes in Washington LABEL and be certain that it is up to date.
presents various chemicals and their uses against
pest problems in Washington vineyards. While Always consult with your processor, winery rep-
the recommendations are based on eastern resentative, or Extension agent if you have any
Washington conditions, the information may questions on approved pesticides or pesticide uses.
often be applied to similar pest problems found The registration status of various chemicals, for-
throughout the state. Specific and more detailed mulations, and manufacturers’ products changes
information on pests and diseases can be found rapidly. You may lose your crop or market if you
in the Field Guide for Integrated Pest Management in misapply or use improper materials that leave il-
Pacific Northwest Vineyards (PNW644). legal residues on your crop.
Recommendations are suggested guidelines. Pests Not on Product Label: Some suggested
They are not intended to represent pest control uses of pesticides in this publication are for pests
programs. The use of other materials and varying not listed on product labels. These are indicated by
rates and treatments for control of particular pests the symbol '*'. Such uses comply with the federal
depends on individual circumstances. law (FIFRA), which says a use is consistent with
label directions provided the crop or site is on the
Caution: Before making any application of chemi- label and directions concerning rates and interval
cals to any vineyard, READ THE COMPLETE before harvest are followed.
PESTICIDE SAFETY
Precautions in Use and Storage employees handle tox class I or II organo-
phosphate or n-methyl carbamate pesticides.
• If you plan to apply any of the more toxic
For any employees who exceed 30 hours of
pesticides, make sure others know the trade
handling in any consecutive 30 day period,
names and active ingredients you are using. you must implement a medical monitoring
• If you anticipate using the more toxic cho- program.
linesterase inhibiting materials, your physi- • Wear water-repellent protective clothing
cian may suggest that you have a preseasonal while spraying hazardous materials, as toxic
blood test to determine your normal cho- pesticides can be absorbed into the body
linesterase activity level. Your physician will through the skin. Applicators should remove
then be in a better position to deal with a contaminated clothing and bathe as soon
sudden illness. If you are provided with a after application as possible. Clothing should
supply of atropine tablets for cholinester- be laundered separately from any other
ase inhibiting poisoning, do not take them household items. Special protective equip-
before definite symptoms occur. If you ever ment such as rubber gloves and respirator
take atropine tablets, call your physician as masks, should be washed daily.
soon afterward as possible.
• Wear a respirator mask when loading or mix-
Any person who is ill enough to receive a ing wettable powders or when applying dust.
single dose of atropine should be kept under The respirator should be approved for the material
medical observation for 24 hours, because in question by the U.S. Bureau of Mines or The
atropine may produce only temporary relief National Institute for Occupational Safety and
of symptoms in what may prove to be a seri- Health (NIOSH). An approved respirator should
ous case of poisoning. Keep atropine tablets be worn whenever the more volatile toxic
away from children. Another antidote for compounds are being used. This is especially
treating cholinesterase inhibiting poisoning, important when working with concentrate
pralidoxime chloride, available as protopam materials in hot weather since they volatilize
chloride (2-PAM), is available at some hospi- more readily at higher temperatures. The filter
tals and clinics in the Pacific Northwest. and pads should be changed daily or more
• Washington State Department of Labor often if odor of the chemical is detected.
& Industries (WAC296-307-148) requires • Make empty containers of liquid pesticide
employers to track the number of hours as safe as possible before disposal. Triple-
1rinse containers and pour rinsate into the • Pesticides that persist for long periods of
spray mixture you are making up. Puncture time in the soil may injure susceptible crops
or crush triple rinsed containers to ensure planted the following year and may result in
they can not be reused. Offer plastic or metal illegal residues. Observe restrictions concern-
containers for pesticide container recycling ing the intervals and crops which may be
(http://www.acrecycle.org/). Washington grown in treated soils.
State does not allow burning of used pesti-
cide containers. • Some pesticides may cause plant injury under
certain conditions or on certain varieties. Be
• Keep your pesticide storage area locked. Keep
sure the material is recommended for use on
used/empty pesticide containers in your stor-
the plant to be treated and that conditions are
age area.
favorable for application.
• Do not smoke, chew tobacco, or eat while
• Some processors may not accept a crop
spraying or while your hands are contami-
nated, especially with concentrate materials. treated with certain pesticides. If crops are
going to a processor, be sure to check with
• Mix pesticides according to label directions their field representative before applying
and apply at the recommended rate. pesticides.
• Experience shows that poisoning occurs
• When a permanent vineyard crop cover has
most often in hot weather. Spray with the
flowers, the cover must be mowed before
more toxic materials during cooler periods
spraying to protect pollinators.
whenever possible. Take extra care when it
is necessary to spray during periods of high
temperature.
Pesticide Disposal
• Collect spilled material and absorbent for
later use or hazardous waste disposal. Wash Most pesticide products become hazardous waste
the contaminated area with soap and lots upon disposal and thus fall under the Washing-
of water. The breakdown of these insecticides ton State Dangerous Waste Regulations, Chap-
can be accelerated by using a weak lye ter 173‑303 WAC. The Washington State Depart-
solution. ment of Ecology is the agency responsible for
• Keep soap and water available, especially administering these regulations. The regulations
where mixing and applying highly toxic are complex. A grower who needs to dispose of
pesticides. pesticide formulations or excess tank mix should
contact the appropriate regional Ecology office for
• Do not apply pesticide sprays and dusts
guidance.
when there is a temperature inversion. This
condition occurs when the air next to the Northwest Regional Office (Bellevue):
ground is at a lower temperature than the 425-649-7000
air above it. The air cannot mix vertically,
Southwest Regional Office (Lacey):
and spray or dust particles may be carried
360-407-6300
horizontally for a great distance. The pres-
ence of a temperature inversion is indicated Central Regional Office (Yakima):
when smoke is observed to move horizon- 509-575-2490
tally rather than vertically. Temperature
Eastern Regional Office (Spokane):
measurements indicate an inversion when
509-329-3400
it is cooler 8 feet above the ground than it is
at 32 feet.
The Washington State Department of Agriculture
• Cover or remove food and water containers Waste Pesticide Program collects and disposes of
when spraying around livestock areas. Avoid unusable pesticides owned by agricultural producers.
contamination of fish ponds, streams, and This program depends on state funding. Several col-
lakes. lections are held throughout the state each year. Con-
• Avoid drift of pesticides to other crops—do tact 360-902-2056, or 1-877-301-4555, press 1, then
not spray with leaking hose or connections— 5; or look for information on the Internet at http://
avoid working in the spray drift cloud or dust. agr.wa.gov/pestfert/pesticides/wastepesticide.aspx.
2Symptoms of Poisoning beled as soon as possible.) If the label cannot
be removed easily, take along the container.
Organophosphorus pesticide poisoning is indicated
3. Decontamination is extremely important.
by one or more of the following symptoms: gid-
If the pesticide has come in contact with
diness, headache, nausea, vomiting, excessive
skin and clothing, immediately remove all
sweating, and tightness of the chest. These may
clothing and bathe the victim with gener-
be followed or accompanied by blurring of vision,
ous amounts of soap and water, rinsing
diarrhea, excessive salivation, watering of the eyes,
thoroughly. Avoid contaminating yourself
twitching of muscles especially in the eyelids, and
by using protective clothing such as rubber
mental confusion. One of the most characteristic
gloves and apron.
signs is constriction of the pupils, but this may
be preceded by dilation. Late signs are fluid in the 4. If the eyes have been contaminated, wash
chest, convulsions, coma, loss of urinary or bowel immediately with flowing water for at least
control, and respiratory failure. Onset of symptoms 15 minutes.
more than 12 hours after the termination of expo- 5. Never try to give anything by mouth to an
sure excludes the possibility of organophosphate unconscious person.
poisoning.
Carbamate pesticide poisoning is indicated by symp- Reporting Poisonings and Pesticide
toms similar to those seen in organophosphate
poisoning.
Accidents
Chlorinated organic pesticide poisoning is indicated by Prompt investigation of pesticide accidents, mis-
hyperexcitability, tremors, and convulsions. Gen- use, or poisonings by appropriate state or federal
eral symptoms, which are also indicative of other agencies is essential to minimize harmful effects,
illnesses, include malaise, headache, fatigue, lack to determine causes and responsibilities, and to
of appetite, and weight loss. Symptoms have been reduce the possibility of recurrences. These agen-
reported as soon as 30 minutes after massive expo- cies have trained investigative personnel to handle
sure, but generally develop more slowly. Maximum such problems, but to do their job effectively it
symptoms are usually reached within a few hours is important they be informed as soon as pos-
after acute exposure. sible after an incident occurs. Otherwise valuable
information may be lost, or it may be too late to
adequately protect public health or property.
Emergency Treatment
Human Poisonings or Suspected Excessive
Emergency information can be obtained from the
Exposure
National Capital Poison Center at 1-800-222-1222.
The person answering your call will refer you to As soon as the victim is under a physician’s care,
the nearest hospital handling pesticide poisonings. notify the following agency as soon as possible.
This is a toll-free number, which is staffed 24-hours Reports from growers, while not required, are
a day. helpful.
Organophosphorus pesticides cause the vast For human poisonings or excessive exposure,
majority of occupational poisonings that lead to contact:
the need for emergency treatment. However, the
following suggestions apply to any type of pesti- Washington State Department of Health
cide poisoning: Division of Environmental Health
Office of Environmental Health Assessments
l. If breathing stops, the most important first P.O. Box 47846, Olympia, WA 98504-7846;
aid is artificial respiration. or call 1-877-485-7316
2. Call a physician immediately for instructions
on first-aid measures. Get the victim to the Accidents Involving Application
physician or a hospital as soon as possible. If
you know which pesticide may be involved, For drift problems, animal poisonings, plant dam-
take along a label for the doctor’s informa- age, fish kill, etc., notify the Washington State
tion. (However, be sure the container is rela- Department of Agriculture, Pesticide Management
3Division (WSDA), P.O. Box 42589, 1111 Wash- Accidents Involving Storage or Transportation
ington Street, S.E., Olympia, WA 98504-2589.
Complete state laws and regulations are available If significant pesticide contamination results from
on the Internet at http://agr.wa.gov/Lawsrules/, or fires, floods, spillage, leakage, etc., notify the De-
from one of the four branch offices listed below; or partment of Ecology at regional numbers listed on
call toll-free, 1-877-301-4555. page 2 under Pesticide Disposal.
WSDA Pesticide Management Division— Other Sources of Information
Spokane Branch
222 N. Havana, Suite 203 For nonemergency information on pesticide toxic-
Spokane, WA 99202-4776 ity, hazards, and treatment for poisonings, refer
to the pesticide product Safety Data Sheets (SDS).
WSDA Pesticide Management Division— For additional toxicology information, contact the
Moses Lake Branch Washington State Department of Health, Office
821 E. Broadway, Suite 4 of Environmental Health Assessments, P.O. Box
Moses Lake, WA 98837 47846, Olympia, WA 98504; or call 877-485-7316.
WSDA Pesticide Management Division— The Department of Labor and Industries provides
Wenatchee Branch a list of medical monitoring providers for
1505 N. Miller Street, Suite 140 cholinesterase testing at http://www.lni.wa.gov/
Wenatchee, WA 98801-1569 Safety/Topics/AtoZ/Cholinesterase/ProvidersList.asp.
WSDA Pesticide Management Division— For information on regulations concerning trans-
Yakima Branch portation of hazardous materials, contact the Wash-
21 N. 1st Avenue, Suite 236 ington State Patrol, P.O. Box 42614, Olympia, WA
Yakima, WA 98902 98504-2614; or call 360-753-0281.
4WEED CONTROL
Weeds can directly compete with grapevines To reduce the hazard of injury to vines as well
for water, nutrients, and light. Weeds may also as to ensure the maximum effectiveness of the
impact vines indirectly, by serving as alternate herbicides applied, select your equipment and its
hosts for insect pests and pathogens; providing use carefully. Herbicides need to be applied with a
habitat for rodents; altering the distribution of fixed boomtype applicator equipped with flat, fan-
irrigation water; interfering with the deposition type nozzles. The height of the boom depends on
of pesticides; and impeding the movement the height of weeds, the nozzles, and their spacing.
of workers and equipment. Successful weed Take care to ensure a uniform spray pattern and,
management can be achieved by employing a thereby, a uniform herbicide deposit. Similarly,
combination of strategies, which includes the use the speed of travel must be closely regulated. It is
of herbicides, to eliminate unwanted vegetation limited not only by safety, but also by the capacity
from vineyards. Herbicides, however, act upon of the pump. Regulating the pressure does not suf-
different weed species and in different ways; care ficiently alter the output. In general, use speeds of
must be taken to ensure that the selected products around 1.5 to 2 miles per hour.
will be effective at controlling the weed species
that are present in the system. Herbicides are Use low pressures (20 to 35 psi) to ensure coverage
also capable of causing serious injury or death of and penetration while minimizing spray drift.
vines and/or may have significant unintended
NOTE: With 2,4-D or glyphosate, reduce the
consequences on neighboring ecosystems.
pressure to less than 20 pounds (psi).
Consequently, applicators must ensure that an
acceptable level of crop safety can be achieved Constant agitation of the spray mixture is essen-
and that off-site/off-target damage is prevented. tial with wettable powders and dry flowables,
and agitation must be vigorous when using oils.
The most appropriate choice of herbicide (or com- A defoaming agent can be used. Follow quantity
bination of herbicides) will be affected by numerous and directions on label.
factors including:
• how weed control will be achieved,
General Precautions
• the kind of weeds to be controlled,
1. Do not apply any herbicide to grapes
• the size and/or age of the weeds to be
unless there is a label registration for its
controlled,
use on grapes.
• soil type and herbicide incorporation strategy,
2. Check all herbicide or other pesticide uses
• the quantity and quality of the spray water, with the processor or field representative
• the age and health of the vines. before using.
3. Do not use a combination of herbicides or
other chemicals with herbicides unless the
Application Rate and Equipment
combination has been thoroughly tested and
The rate or amount of herbicide to be applied is confirmed to not cause phytotoxic effects.
shown as the amount per acre of the actual por-
4. Avoid herbicide application to any part of
tion treated (i.e., the area directly under the vine
the vine. Do not use weed sprayers to apply
row, or the area between vineyard rows), and not
other pesticides to vines.
the total herbicide to be applied to an acre of vine-
yard. Thus, a 10-foot row spacing with a 2-foot 5. Do not repeatedly use the same mode of
band of herbicide sprayed under the vines would action (MOA) throughout the season (Table 1).
be two-tenths (one-fifth) of an acre to be treated or Using different MOAs is part of a good
20% of one acre of vineyard. herbicide resistant management program.
5Table 1. Mode of action of herbicides registered for use in grapes in the Pacific Northwest.
Resistant Weed
Herbicide Trade Name1 Chemical Name WSSA Group2 HRAC Code3
Species in PNW?4
Fusilade fluazifop 1 A Yes
Poast sethoxydim 1 A Yes
Select (and others) clethodim 1 A Yes
Matrix (and others) rimsulfuron 2 B Yes
Kerb pronamide 3 K1 Yes
Prowl H2O pendimethalin 3 K1 Yes
Surflan (and others) oryzalin 3 K1 Yes
Treflan (and others) trifluralin 3 K1 Yes
Princep (and others) simazine 5 C1 Yes
Karmex (and others) diuron 7 C2 Yes
Roundup (and others) glyphosate 9 G Yes
Rely (and others) glufosinate 10 H Yes
Solicam norflurazon 12 F1 No
Aim carfentrazone 14 E No
Chateau flumioxazin 14 E No
Goal (and others) oxyfluorfen 14 E No
Venue pyraflufen 14 E No
Devrinol napropamide 15 K3 Yes
Casoron dichlobenil 20 L No
Gallery (and others) isoxaben 21 L No
Gramoxone (and others) paraquat 22 D No
1
Herbicide Trade Names are for example purposes only and does not indicate an endorsement of a specific brand or company.
Some active ingredients are available under multiple trade names.
2
WSSA = Weed Science Society of America
3
HRAC = Herbicide Resistance Action Committee
4
At least one weed species resistant to this mode of action documented to occur in ID, OR, or WA; data from http://www.weedscience.org
maintained by Dr. Ian Heap.
6Factors Affecting Control It is possible for weed communities in vineyards
to be comprised of species that are naturally sensi-
Classification of Herbicides tive to different herbicides or herbicide modes of
action. They may also differ with respect to life his-
Herbicides differ with respect to how they are used. tory traits or emergence patterns. Herbicide labels
When describing herbicides, we can refer to them list the weed species that can be suppressed or
as being either ‘pre-emergence’ or ‘post-emergence’ controlled by the active ingredient. The labels will
applied. Pre-emergence herbicides are soil-applied also provide instructions on when to time applica-
products that act primarily on germinating weed tions to maximize herbicide efficacy and will also
seeds or young weed seedlings. They persist in the list appropriate tank-mix partners to help growers
environment to provide extended weed control expand the spectrum of weed control. Always read
within or across seasons. labels to ensure that herbicide applications will be
both effective and safe.
Products classified as post-emergence herbicides
are applied directly to the foliage of emerged weeds For help on weed identification, visit: http://wine.
to elicit control. Post-emergence herbicides can wsu.edu/researchextension/plant-health/weed-
be further characterized as being either ‘contact’ management/. In addition, Washington State
or ‘systemic’ products. Contact generally refers University Extension also provides a free Weed
to herbicides that only affect the tissues that are Identification Service. Information on this service
directly treated with the herbicide—these types of can be found at: http://css.wsu.edu/extension/
herbicides do not move (translocate) to untreated weed-identification/ .
parts of the plant following application. Systemic
or translocated herbicides can move from treated The Size and/or Age of the Weed to be
plant parts to untreated tissues via the xylem or
Controlled
phloem. Although some herbicides may exhibit
both pre- and post-emergence activity, a combina- Weed control strategies may not always be 100%
tion of both foliar and soil-applied products are effective and escapes can occur for numerous
typically used to successfully manage weed com- reasons. One of those reasons is the size of plants
munities in vineyards. at the time of application. The efficacy of post-
emergence herbicides is often diminished when
Often, herbicides are referred to as being either
products are applied to large/mature plants. This
‘selective’ or ‘non-selective’ (which is synonymous
can result from poor spray coverage and the abil-
with ‘broad-spectrum’). A selective herbicide is one
ity of dense foliage to shield sensitive tissue from
that is effective at controlling some species but not herbicide deposition. While plant size is mainly
others. Conversely, a non-selective herbicide is an a concern with contact herbicides, the efficacy
herbicide that can control many different types of systemic products can also be influenced. For
of weedy pests. The most well-known examples example, may perennial species are tolerant of
of herbicide selectivity are 1) the abilities of the many herbicides, including translocated products
‘-fops’ and the ‘-dims’ (i.e. fluazifop and clethodim) like glyphosate, because their root systems and
to suppress grasses but not broadleaf species and 2) nutrient reserves support regeneration/regrowth.
the control of broadleaved weeds, but not grasses, There are several strategies that growers can take
by synthetic auxins (i.e. 2,4-D). to maximize weed control with post-emergence
herbicides, including: timing applications to treat
Kinds of Weeds to be Controlled weeds while they are small/tender, applying herbi-
cides at appropriate rates and volumes, and using
Weed species can be described by the length of label recommended adjuvants to improve herbicide
their life cycle. Annual weeds (both winter-and contact and penetration.
summer-germinating) emerge, grow, flower, and set
seed all within the course of a year. Biennial weeds The development of herbicide resistance is a sig-
complete their life cycles over the course of two nificant concern for growers of perennial crops,
years whereas perennials can persist across multi- including grapes. Weed species with resistance to
ple seasons. Not all herbicides are equally effective glyphosate, glufosinate, and paraquat have been
against all three types of weed species. For exam- confirmed in California and Oregon as well as
ple, although the seedlings of perennial weeds may other Western states. Incomplete weed control can
be controlled by pre-emergence herbicides, much increase the chance of a herbicide resistant biotype
like annual species, mature plants are unlikely to reaching reproductive maturity, setting seed, and
be impacted. becoming established in a production system. Her-
7bicide labels will provide instructions to applicators The Quantity and Quality of the Spray Water
regarding strategies for resistance management.
Additional information can be found at the Weed Water is the main carrier for crop protection
Science Society of America’s (WSSA) web-page: products, including herbicides. Consequently, the
http://wssa.net/wssa/weed/resistance/. quantity and quality of spray water can impact
herbicide distribution and performance. In gen-
eral, higher carrier volumes have been shown to
Soil Type and Herbicide Incorporation Strategy
improve the efficacy of foliar-applied herbicides
The length of time that pre-emergence herbicides (glyphosate is a notable exception). Post-emer-
may reside in a treated area will be influenced by gence herbicide labels provide instructions regard-
multiple factors, such as soil texture and organic ing the recommended application parameters (i.e.
matter content. Soils that are high in clay or GPA, pressure, droplet size) to maximize weed
organic matter can bind herbicides tightly to the control potential. Carrier volume can also affect
soil matrix. Conversely, coarse soils can enhance the delivery of soil-applied products; always read
leaching potential. Herbicide persistence is also a the herbicide label to ensure that all herbicides are
function of herbicide chemistry. Some herbicides used both effectively and safely.
naturally bind very tightly to soil particles whereas
others are significantly more mobile. The interac- Water quality factors can also affect herbicide per-
tions between soil and herbicide chemistry can formance and safety. For example, herbicides that
affect a product’s use rate within a given system. are weak acids (such as glyphosate) can have their
This, in turn, may influence how well a herbicide efficacy reduced under alkaline conditions (pH >7).
performs, as well as how long it remains in the Salts and soil particles in spray water can bind to
treated zone. some herbicides, thereby affecting their dispersal,
deposition, and uptake. Water quality recommen-
To be effective, pre-emergence herbicides must dations exist for both pre- and post-emergence
be incorporated (usually 1–2" deep) into the soil herbicides; read labels carefully.
profile. Incorporation is required because these
products are mostly active against newly germi- The Age and Health of the Vines
nated weed seedlings. Additionally, incorporation
is needed to reduce or prevent volatilization and Vine age can affect what herbicides are available
photodegradation, which can result in reduced for use in a production system. While competi-
herbicide performance. The length of time an tion from weeds is most severe in in newly planted
herbicide can remain on the soil surface varies grapes, not all herbicides are labeled for use around
dramatically among products. Even if an herbicide young canes. Growers should be aware of re-plants
does not require immediate activation to prevent in mature vineyards before making soil-applied
product loss, an unincorporated herbicide is unable treatments. Regardless of vine age, residual herbi-
to control emerging weeds. While many growers cides should be applied to soil that is settled and
will time herbicide applications to take advan- free of cracks to minimize the potential for crop
tage of naturally occurring rainfall, uncoopera- injury. Avoid using herbicide-treated soil to backfill
tive weather may require the use of irrigation for planting holes. Unless specifically noted on the
activation. Some products, due to their mobility label, avoid herbicide spray or mist contact with
and potential for crop injury, may be incompatible leaves, green bark, roots, or fruit to reduce the
with sprinkler systems; this is of particular concern potential for crop injury.
when grapes are grown on shallow, coarse, sandy,
or gravelly soils. Crop safety is paramount, however the safety of
species and habitats outside of the treated area are
Check pre-emergence herbicide labels, carefully, also a significant concern. Follow label instruc-
to ensure that the product is being applied at tions to reduce the potential of spray or volatil-
the proper time of year to effectively target the ity drift and subsequent damage to off-target
weed species of concern in a vineyard. Apply and organisms. Surface and groundwater advisories
incorporate products as described to prevent crop and buffer zone recommendations are included
injury; this includes following timing recommen- on several herbicide labels; read and follow all
dations to avoid treating vineyards when and if labeled guidelines to prevent contamination of
significant crop damage could occur. aquatic systems.
8General Precautions planting, preferably in the winter after transplant-
ing. Casoron CS can be applied after vines are 12
1. Do not apply any herbicide to grapes unless
months old.
there is a label registration for its use on
grapes.
Diuron (Karmex DF, Diuron 4L) WSSA Group 7:
2. Check all herbicide or other pesticide uses
with the processor or field representative
photosystem II inhibitor
before using. Diuron has pre-emergence and some post-emer-
3. Do not use a combination of herbicides or gence activity. Weeds should not be >2 inches in
other chemicals with herbicides unless the height or diameter or else post-emergence control
combination has been thoroughly tested and may be compromised.
confirmed to not cause phytotoxic effects.
Diuron should be applied during the rainy pe-
4. Avoid herbicide applications to any part of riod (from about November 1 to February 15 in
the vine. Do not use weed sprayers to apply eastern Washington), but not to frozen ground.
other pesticides to vines. Spring applications may not be as effective unless
5. Do not use the same mode of action (MOA), rains fall soon after application to incorporate the
repeatedly, throughout the season. Using herbicides; however, heavy rains following a spring
different MOAs is part of a good herbicide application may result in plant injury. Application
resistant management program. to vineyards under sprinkler irrigation can be haz-
ardous. Apply as a banded application to vineyards
that have been established for at least 3 years and
Soil-applied Herbicides: that have vines >1.5 inches in diameter. Do not
apply to vineyards with shallow, coarse, sandy, or
Dichlobenil (Casoron CS, Casoron 4G) WSSA gravelly soils or to soils with less than 1% organic
Group 20: inhibits cell wall synthesis matter. Serious herbicide injury to grape roots has
occurred when this herbicide is applied under
A soil-active herbicide for long-term or seasonal improper conditions. Do not apply more than 5 lbs
control of most weeds. Dichlobenil can suppress of Karmex DF per acre in a single use; do not apply
the growth of some perennials (Canada thistle, more than 10 lbs per acre per year. Do not apply
quackgrass, field bindweed and bermudagrass), more than 4 qts of Diuron 4L per acre in a single
although higher use rates are recommended. use; do not apply more than 8 qts per acre per year.
Dichlobenil is most effective when applied in the
fall, at the beginning of the rainy season (about
Flazasulfuron (Mission) WSSA Group 2:
November 1 to February 15 in eastern Washington) acetolactate synthase (ALS) inhibitor
and when the ground is cool. Application before
Mission is labeled for the control of certain broad-
a rain will reduce volatility and improve weed
leaf and grass weeds including annual ryegrass,
suppression. Do not apply when the ground is
common mallow, clover and willowherb. Mission
frozen. Applications can be made in the spring up
has both pre- and early post-emergence activity;
to about May 1 (when the soil surface is still 60°F weeds should beformulated product per acre per year (maximum of Alion is most effective when applied in the fall or
0.089 lbs of active ingredient or 5.7 oz of Mission early spring to dry soil surface that does not have
per acre per year). The minimum allowed interval crack or depressions. Apply as a uniform broadcast
between treatments is 3 months. Do not apply or banded application. Alion applications should
within 75 days of harvest. A 25-foot buffer must be followed by 48 hours without irrigation or
be maintained between the point of direct applica- rain; activating moisture (0.25 to 0.5 inches) must
tion and the closest downwind edge of sensitive be received within 21 days or before weed seeds
terrestrial habitats (forested areas, riparian areas), germinate. Do not use on sand or soils contain-
freshwater habitats (lakes, rivers, sloughs), and ing >20% gravel. Alion should not be applied to
estuarine/marine habitats. frozen or snow covered soils, or saturated soils.
Use only on vines established at least five years
Flumioxazin (Chateau SW) WSSA Group 14: that are exhibiting normal growth and good vigor.
Ensure that there is 12 inches of soil between the
protoporphyrinogen oxidase (PPO) inhibitor
soil surface and the major portion of the root. Do
Chateau has both pre- and early post-emergence not apply more than 5 fluid ounces of formulated
activity and can control broadleaf weeds up to product (0.065 lbs of active ingredient) per acre per
about 2 inches tall. If weed emergence is significant year; coarse soils with less than 1% organic matter
or weeds are large, consider mixing flumioxazin require a lower use rate per application. If making
with an approved post-emergence herbicide to more than one treatment per year, allow for 90
improve control. days between applications. Do not apply within
14 days of harvest. Clean spray tank thoroughly
The preferred time for pre-emergence applications after use. Surface and groundwater advisories are
is fall, in order to maximize the potential for rain included on the label because of potential to harm
to activate the herbicide. Do not apply to vines nontarget aquatic organisms, and potential for
established less than 2 years, unless they are trel- runoff and percolation to ground water.
lised at least 3 ft from the ground, and protected
by nonporous wraps, grow tubes, or waxed con- Isoxaben (Gallery DF, Trellis SC) WSSA Group
tainers. Do not apply to non-trellised vines unless
21: cell wall synthesis inhibitor
they are free-standing. New plantings of own-root-
ed varieties should have root systems a minimum A pre-emergence applied herbicide for the control
of 8 inches below the soil surface. Chateau should of many annual broadleaf weeds.
not be applied to soils that are susceptible to dis-
persal by wind; wind-blown, herbicide-treated soil Available for non-bearing (Gallery) and bearing
can cause serious injury to grapes and other plants. (Trellis) vineyards, but do not apply to newly
Do not apply after budbreak through final harvest transplanted vines until the soil has settled and is
in juice and wine grapes, unless using shielded free of cracks. Do not apply Trellis within 165 days
application equipment and applicator can ensure of harvest. Must be incorporated within 21 days
spray drift will not come in contact with crop fruit and before weeds emerge. Activate with 0.5 inch of
or foliage. Dust created by mowing can also injure water or shallow cultivation before weeds emerge.
sensitive species; do not mow between budbreak Most effective when applied to soil that is debris
and final harvest. The application and maximum free. Do not make more than 2 applications per
use rates can vary with weed species and soil type, year up to a max use rate of 1 lb of active ingredi-
but will not exceed 12 oz of formulated product ent per acre per year. Select application rates based
per acre per application and 24 oz of formulated on weeds present.
product per acre per year. Do not apply within 60
days of harvest. Do not apply within 300 yards of Napropamide (Devrinol 2-XT, 50 DF) WSSA
bearing pears.
Group 15: inhibits very long chain fatty acid
synthesis
Indaziflam (Alion) WSSA Group 29: inhibits
cellulose biosynthesis A pre-emergence herbicide for the control of some
annual grasses and broadleaf weeds. Will not give
Alion is labeled for the pre-emergence control of complete control of nightshade, flixweed, tansy
many annual grasses and broadleaf weeds. Con- mustard, tumble mustard, or perennial weeds.
trols perennial weeds from seed, only. The spec-
trum of weeds controlled will be affected by rate Apply fall through spring before weeds germinate.
and the timing of activation. May be applied to both newly planted and estab-
10lished vineyards. Applications made from Novem- essary to activate this herbicide. If weeds begin to
ber 1 to February 15 should be incorporated with emerge before herbicide incorporation, a shallow
irrigation or shallow cultivation if rainfall does not cultivation (1 to 2 inches) will kill existing weeds
occur within 2 weeks of treatment. Performance is and place the herbicide in the zone of weed seed
reduced if excessive residue occurs on the soil sur- germination. Surflan rates vary between 2 and 6 qt
face. Applications made during the spring should per acre per application depending on the desired
be activated with sufficient water to wet the soil length of weed control; the maximum use rate is
to a depth of 2 to 4 inches within 24 hours. Can 12 lbs of active ingredient per acre per year. The
be used safely in sprinkler-irrigated vineyards. The interval required between repeat applications is
pre-harvest interval is 35 for the DF formulation 2.5 months.
and 70 days for 2-XT. Do not apply more than
4 lbs of active ingredient per acre per crop cycle. Oxyfluorfen (Goal 2XL, Galigan 2E,
GoalTender) WSSA Group 14: proto-
Norflurazon (Solicam DF) WSSA Group 12: porphyrinogen oxidase (PPO) inhibitor
inhibits carotenoid biosynthesis
Provides both pre-emergent and early post-
A broad spectrum pre-emergence herbicide that emergent control of broadleaf weeds in dormant
will control many annual broadleaf and grass grapes. It is most effective post-emergence when
weeds found in vineyards. Solicam does not have the seedling weeds have less than four leaves. Post-
any post-emergence weed control activity. emergence weed control can be improved by tank-
mixing with appropriate partners and adjuvants.
Solicam can be applied from fall to early spring
before the weeds emerge to non-frozen soil. The Direct the spray toward the base of vines in late
soil should be settled and firm at the time of winter or spring, avoiding direct plant contact;
application and the surface must be free of soil apply to bare soil. Apply after harvest, but before
clods, depressions, weeds and other plant residue. bud-swell in spring. The closer grapes are to bud
Requires rain to activate. If no rainfall occurs swell at time of application, the greater the chance
within 4 weeks after application, the product of crop injury. Do not apply to grapes established
must be activated by sprinkler irrigation. Applica- less than 3 years unless they have been staked or
tion to vineyards under sprinkler irrigation may trellised 3 feet above the ground. Do not apply
be hazardous to vines growing on coarse soils; do to grapes that are not staked or trellised unless
not use on wine grapes grown in gravelly, sandy, they are free-standing. Apply only to healthy
loamy sand, or sandy loam soils in Washington. vines. Overhead moisture within 3 to 4 weeks will
Norflurazon should not be applied to vines estab- enhance herbicidal activity. The maximum use rate
lished less than 2 years. Whitening may occur if is 1.5 pounds active ingredient per acre per season.
norflurazon is applied within 3 months after bud The lower rate is for control of susceptible broadleaf
break. The maximum use rate per year for grapes seedling weeds; the higher rate should be used for
should not exceed 5 lbs of formulated product larger weeds or for preemergence control.
per acre per year. Do not apply within 60 days of
harvest. Pendimethalin (Prowl H2O, Prowl 3.3 EC)
WSSA Group 3: microtubule assembly
Oryzalin (Surflan AS, other tradenames) WSSA inhibitor
Group 3: microtubule assembly inhibitor
Prowl H2O and Prowl 3.3 EC are pre-emergence
Surflan is a pre-emergence herbicide that is par- herbicides that are particularly effective against
ticularly effective against annual grasses and some grasses.
broadleaved weed species but will not give com-
plete control of nightshade, tansy mustard, or Apply directly to the ground in dormant grapes
tumble mustard. before bud-break and before weeds emerge.
Overhead moisture is required within 7 days
Can be used in newly planted (if the soil has for herbicide activation. Do not apply to newly
settled around vines) and established vineyards. transplanted vines until the soil has settled and no
Apply in late fall or early spring. Safe to use under cracks are present. If applying before transplanting,
sprinkler irrigation. Treated areas must be free of do not allow treated soil to come into contact
established weeds and well worked prior to spray with roots. Do not apply during or after bud swell
application. A half-inch of rain or irrigation is nec- in the spring. Do not apply over the tops of vines
11with leaves or open buds. Both labels include Simazine (Princep 4L, Princep Caliber) WSSA
specific instructions regarding pre-plant or surface Group 5: photosystem II inhibitor
incorporated, surface-applied, and pre-emergence
applications. The use rate is determined by the Princep is a soil applied herbicide with efficacy
weeds requiring control and the length of control against some grasses and broadleaf wed species.
needed. The pre-harvest interval for Prowl H2O
is 90 days. Prowl 3.3 EC is not labeled for use in Apply during the rainy period (from about Novem-
bearing vineyards. ber 1 to February 15 in eastern Washington) as a
single application. Do not apply to frozen ground.
Requires surface moisture for activation. Do not
Pronamide (Kerb 50-W, Kerb SC) WSSA apply to vineyards established less than 3 years or
Group 3: microtubule assembly inhibitor to vineyards with shallow, coarse, sandy, or gravel-
ly soils. Serious herbicide injury to grape roots has
Pronamide is a soil-applied product that is used for occurred when applied under improper conditions.
the control of grasses (annuals and some peren- Application to vineyards under sprinkler irriga-
nials) and some broadleaved species primarily for tion is hazardous. Do not apply more than 4 lbs
pre-emergence although Kerb can control some of simazine (active ingredient) per acre per year.
small weeds that have emerged.
Apply only once in the fall or early winter as a Sulfentrazone (Zeus XC, Zeus Prime XC)
directed application when the soil temperature WSSA Group 14: protoporphyrinogen oxidase
is below 55°F, but not when soil is frozen. Kerb is (PPO) inhibitor
most effective when applied prior to weed emer-
gence, to soil that is relatively free of residue, and A pre-emergence or early post-emergence herbicide
when the application is followed by rainfall or for controlling several species of annual broadleaf
weeds. If weeds are emerged, mix sulfentrazone
irrigation. Use rate will be determined by the weed
with an approved post-emergence herbicide.
species to be controlled and soil type although
the maximum use rate per acre per year is 4 lbs of Apply as a uniform broadcast soil application to
active ingredient. Do not use on vines less than 1 vineyard floors or as a uniform band directed at
year old, on fall-transplanted stock that has been the base of the vines then incorporate into the soil
transplanted less than 1 year, or to spring-trans- with rainfall or irrigation. Trunks can be wrapped
planted stock that has been transplanted less than in non-porous wraps, grow tubes, or wax container
6 months. Pronamide is a restricted-use chemical. to protect against spray contact. Do not apply to
vines younger than 3 years old. Activity of sulfen-
Rimsulfuron (Matrix FNV, Matrix SG) WSSA trazone increases dramatically under alkaline soil
Group 2: acetolactate synthase (ALS) inhibitor conditions or when irrigated with alkaline water.
The pH of the spray solution should be between 5
Matrix has both pre-emergence and very early and 9. If applied after bloom, use a shielded sprayer
post-emergence activity. When weeds are present at to avoid movement of spray mist to flowers.
application, include a labeled burndown herbicide. Sulfentrazone should not be applied to soils that
are susceptible to dispersal by wind. Do not apply
Can be applied broadcast to vineyard floor or to frozen soils. Do not apply more than 12 oz of
banded at the base of the vines. Best pre-emergence Zeus XC per broadcast acre per 12-month period.
results are obtained when the soil is debris-free and A prepackaged mix with carfentrazone (Zeus Prime
moist at time of application, and the site receives XC) is also available for grapes established at least
0.5 inches of rain or irrigation moisture within 2 2 years. Do not apply more than 15.25 fluid ounces
weeks of application. Crops must be established for of Zeus Prime per acre per year. Do not apply
1 year before application (vines should be healthy within 3 days of harvest.
and growing vigorously). Susceptible weeds are
controlled from 60 to 90 days after application. Trifluralin (Treflan 4D, Treflan 4EC, Treflan
Two applications separated by 30 days are allowed HFP) WSSA Group 3: microtubule assembly
if applied in bands that cover half of the vineyard. inhibitor
Do not exceed 4 ounces of formulated product per
acre on a broadcast basis per year. For best results, A soil-applied product that is used for the control
maintain spray tank solution at pH 5 to 7. The pre- of grasses (annuals and some perennials) and many
harvest interval is 14 days. broadleaved species.
12Can be used prior to transplanting as well as estab- Fluazifop and sethoxydim are registered for use in
lished vineyards. Apply before times of expected nonbearing and bearing vineyards; clethodim is
weed emergence or immediately after existing registered for use only in nonbearing vineyards that
weeds are controlled. Trifluralin is best applied in will not be harvested within 1 year after treatment.
the spring to provide almost season-long control They are foliage applied, translocated herbicides
of weeds. Must be mechanically incorporated 1 to which will control most actively growing grass
2 inches deep within 24 hrs following application weeds. The herbicide will not control annual blue-
to be effective and prevent loss of activity. Mixing grass or the fine-leaf fescues. Results can be erratic
activities should be done by equipment that will on grasses stressed from lack of vigor, drought, high
not injure vine roots. Since trifluralin (Treflan) is temperature, or low fertility. Apply fluazifop to
not leached into the soil, it is best applied in the actively growing grasses as a directed spray in water.
spring and can be used in vineyards with sandy Add 1 quart crop oil concentrate or 0.5 pint nonion-
soils or sprinkler irrigation. Use lower rates on ic surfactant to 25 gallons of spray material. Apply
sandy soils or soil containing low organic mat- when susceptible grasses are in the labeled growth
ter levels. Lower rates should also be used in areas stage. Apply clethodim to actively growing grasses
receiving less than 20 inches rainfall and irrigation. as a directed spray in water. Add 1 pint of nonionic
See label about mist propagated vines. The pre- surfactant to 50 gallons of spray material. Apply
harvest interval is 60 days. sethoxydim to actively growing grasses listed on the
label at the 4- to 5-leaf stage (6 to 12 inches tall).
Add 2 pints of a non-phytotoxic oil concentrate per
Foliar-applied Herbicides: acre. Do not apply to grasses which are stressed.
Carfentrazone-ethyl (Aim EC) WSSA Group 14:
protoporphyrinogen oxidase (PPO) inhibitor Glufosinate (Rely 280) WSSA Group 9:
glutamine synthase inhibitor
A contact herbicide that is active on annual broad-
leaf weeds. Foliage applied, contact herbicide used to control
annual broadleaf and grass weeds and to suppress
Carfentrazone may be applied alone or as a tank perennial weeds.
mixture with other labeled herbicides as a post-
emergence directed treatment or as a hooded Apply when weeds are small and actively growing.
spray between rows to control emerged and Use as a directed spray. Avoid contact of spray or
actively growing weeds. Good spray coverage of mist on new foliage or green shoots as severe vine
the weeds is essential for control. May be applied injury may result. Use directed spray and shield
anytime during the season. Control is enhanced young vines. Thorough coverage of target weeds
with the addition of a nonionic surfactant or is essential for control. No additional surfactant is
crop oil concentrate. Care must be taken not to needed. May be tank mixed with labeled residual
allow spray mist to contact desirable fruit, foliage herbicides to control later germinating weeds.
or green stem tissue. Lower rates may be used to Apply in a minimum of 20 gallons of water per
control small susceptible broadleaf seedling weeds acre. Do not exceed 4.5 lb ai/acre per 12-month
at the 2- to 3-leaf stage. The higher rate is needed season. Apply only to grapevines established at
to control larger weeds up to the 6-leaf stage. Do least 1 year. Do not apply within 14 days of harvest.
not use on newly-transplanted vineyards. Do not
apply more than 2 oz of formulated product per Glyphosate (Roundup and other tradenames)
acre per application. Do not apply more than WSSA Group 10: inhibits EPSP synthase
7.9 oz of formulated product per acre per season.
Do not make sequential applications less than 14 A translocated herbicide which controls many
days apart. The pre-harvest interval is 3 days. annual and perennial weeds, both grasses and
broadleaves.
Fluazifop (Fusilade DX), clethodim (Select and For optimum control of perennial weeds such as
other tradenames) and sethoxydim (Poast) Canada thistle, field bindweed, and quackgrass,
WSSA Group 1: acetyl CoA carboxylase consult labels for recommended rates and correct
(ACCase) inhibitors timing in relation to weed growth. Adding sur-
factant or mixing ammonium sulfate according
Post-emergence control of annual and perennial to label may improve control of slightly stressed
grasses. weeds. Apply in 20 to 60 gallons of water per acre
13on emerged and actively growing weeds. Glypho- of water for thorough coverage of the weeds. Five
sate does not provide residual weed control. If applications are allowed per year. This is a restrict-
repeated treatments are necessary for weed con- ed-use herbicide. Do not ingest or inhale spray
trol, do not exceed a total of 8 lbs ae per acre per mist. Wear protective clothing, face shields when
year. Do not treat between 14 days before harvest mixing, and respirators during application.
to fall dormancy when green foliage or shoots are
in the spray zone. Follow all precautions on label. Pyraflufen ethyl (Venue) WSSA Group 14:
Repeated glyphosate applications have selected for
protoporphyrinogen oxidase (PPO) inhibitor
resistant biotypes of ryegrass, as well as other weed
species, in the PNW. To avoid weed resistance, A contact herbicide that is active on annual broad-
rotate and mix weed control practices. leaf weeds.
Paraquat (Gramoxone Inteon, Firestorm) WSSA Apply when the weeds are less than 4 inches tall
or 3 inches across. Use as a directed spray and
Group 22: photosystem I electron diverter
thoroughly cover weeds. Use lower rates for small
Foliage applied, contact herbicide used to control weeds and higher rate for larger weeds. Avoid
annual broadleaf and grass weeds and to suppress contact with desirable foliage, green bark, or fruit.
perennial weeds. Use an approved agricultural buffering agent if
using in water of equal to or greater than pH 7.5.
Apply as a directed, shielded spray to the base of The addition of crop oil concentrate or nonionic
vines when grasses and other weeds are growing surfactant is recommended for optimum control.
actively and new growth is from 1 to 6 inches Tank mixing can increase the weed spectrum that
high. With mustard-type annual weeds, apply is controlled. Mix only the amount of solution
before leaves exceed 1 inch in diameter. Avoid that can be sprayed within 4 hours. Do not make
contact of spray or mist on new foliage or green more than 3 applications or exceed 6.8 fluid
shoots as severe vine injury may result. Add a non- ounces per acre per season. Allow at least 30 days
ionic surfactant or crop oil concentrate according between applications. Shield 1 year old or younger
to label; avoid anionic formulations that react in vines with non-porous wraps, grow tubes, or wax
the tank to form insoluble precipitates. Paraquat is containers. Apply in a minimum of 10 gallons of
corrosive to aluminum. Spray in 50 to 200 gallons water per acre.
14HERBICIDE INJURY
Herbicide Injury Report incidences of injury or severe symptoms in
grapes from herbicide drift to the Washington State
Herbicide injury symptoms can sometimes be con- Department of Agriculture toll-free 1-877-301-4555.
fused with injury resulting from viruses or deficien-
cy of plant nutrients. 2,4-D, glyphosate, and some
other classes of herbicides affect the new growth 2,4-D Drift Documentation
of grapevines, causing deformation of both shoots
and leaves. The symptoms tend to disappear later To report damage in vineyards due to 2,4-D drift,
in the season as the malformed foliage is covered adequate documentation is necessary. Most docu-
up by new growth. Serious crop damage can result mentation must occur early in the spring, and
if contamination occurs during the early portion weekly notes on plant development and the devel-
of the growing season. Leaf symptoms of herbicide opment of damage symptoms are also needed.
injury and other disorders can be found online at
WSU (http://wine.wsu.edu/extension/). See the For more information regarding the documenta-
Field Guide for Integrate Pest Management in Pacific tion of 2,4-D drift, please visit the WSU Food &
Northwest Vineyard (PNW 644) for pictorial guides to Environmental Quality Lab website at http://feql.
determining damage caused by various herbicides. wsu.edu/eb/.
15WEED MANAGEMENT PROGRAM FOR GRAPEVINES
Broad categories of weeds and vineyard age are described for each herbicide. Detailed application notes are
found in the previous sections on “Soil-applied” and “Foliar-applied” herbicides. It is important to reference
those sections and the label before any application.
MATERIAL PER ACRE TREATED*
Rate of formulated
Weeds to be Active ingredient product per application
controlled and formulation per treated acre Vineyard age
PRE-EMERGENCE WEED CONTROL
Annual & some dichlobenil (Casoron 4G, 100–150 pounds Casoron 4G for vineyards which have been transplanted
perennial weeds Casoron SC) more than 4 weeks; Casoron CS after vines have been
1.4–2.8 gallons transplanted for at least 12 months.
Annual grasses & indaziflam (Alion) 3.5–5.0 fluid ounces Use only on vines established at least five years that are
broadleaf weeds exhibiting normal growth and good vigor.
Annual broadleaf isoxaben (Gallery DF, 0.66–1.0 pounds Gallery is labeled for non-bearing crops, only. Trellis is
weeds Trellis SC) available for non-bearing and bearing vineyards, but do
not apply to newly transplanted vines until the soil has
settled and is free of cracks.
Annual grasses & napropamide a: 2 gallons For newly planted and established vineyards.
broadleaf weeds (a: Devrinol 2-XT,
b: Devrinol 50 DF) b: 8.0 pounds
Annual grasses & norflurazon (Solicam DF) 1.25–5.0 pounds Norflurazon should not be applied to vines established
broadleaf weeds less than 2 years.
Annual grasses, some oryzalin (Surflan AS) 2.0–6.0 quarts Can be used in newly planted (if the soil has settled around
broadleaf weeds vines) and established vineyards.
Annual grasses, some pendimethalin a: 2.4–4.8 quarts Prowl 3.3 is labeled only for nonbearing vineyards; Prowl
broadleaf weeds (a: Prowl 3.3 EC, H2O may be used in nonbearing or bearing vineyards.
b: Prowl H2O) b: 3.2–6.3 quarts Do not apply to newly transplanted vines until the soil has
settled and no cracks are present.
Annual grasses, some pronamide a: 2.0–8.0 pounds Do not use on vines less than 1 year old, on fall-
broadleaf weeds, (a: Kerb 50W, transplanted stock that has been transplanted less than
some perennials b: Kerb SC) b: 2.5–9.5 pints 1 year, or to spring-transplanted stock that has been
transplanted less than 6 months.
Annual grasses & simazine a: 2.0 quarts For vineyards established at least 3 years.
broadleaf weeds (a: Princep 4L,
b: Princep Caliber 90) b: 2.2 pounds
Annual grasses, some trifluralin (a: Treflan 4D, a, b, c: 2.0-4.0 pints For newly planted and established vineyards. For newly
broadleaf weeds b: Treflan 4 EC, c: Treflan HFP) planted vineyards, follow rate on label based on soil type.
PRE-EMERGENCE AND EARLY POST-EMERGENCE WEED CONTROL
Annual grasses & diuron (Diuron 4L) E WA 0.8-2.4 quarts For vineyards established at least 3 years.
broadleaf weeds
W WA 1.6–2.4 quarts
Annual grasses & flazasulfuron (Mission) 2.14–2.85 ounces For vineyards established at least 2 years; nonporous
broadleaf weeds wraps, grow tubes, waxed containers, or other protective
sleeves are required for vines in their 3rd season of growth.
Annual broadleaf flumioxazin (Chateau) 6.0–12.0 ounces For vineyards established at least 2 years.
weeds
*Rates as given are per acre of ground sprayed. For band or spot treatment, calculate rates according to the actual portion of an acre treated.
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