Abstracts for Idaho Noxious Weed Virtual Conference January 13-14, 2021 - IDAHO NOXIOUS WEED CONTROL ASSOCIATION
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
Abstracts for Idaho Noxious Weed Virtual Conference January 13-14, 2021 Wednesday, January 13, 2021 8:15 – 9:15 AM Inspirational Tales about Improving, Restoring and Preserving Idaho’s Rangelands Steve Stuebner (Writer & Producer - Life on the Range, Idaho Rangeland Resources Commission Steve Stuebner is the writer and producer of the award-winning Life on the Range video series, a public education project sponsored by the Idaho Rangeland Resources Commission. Over the last 10+ years, Steve has produced more than 70 videos that spotlight many examples of exemplary range management in Idaho and extreme challenges related to range-restoration following big wildfires. In his presentation to the Idaho Noxious Weed Conference, Steve will share authentic, real-world examples of ranchers, research leaders and agency conservation pros working together to improve the land and combat noxious weeds. Often times, the strength of robust partnerships and a strong proactive approach can bring the best results with sufficient funding to back up the vision for improving and preserving Idaho’s rangelands. 9:20 – 10:20 AM Range/Pasture/Wildland Herbicide Modes of Action Ian Burke (Professor, Washington State University) Knowledge of herbicide modes of action, as well as herbicide behavior in plants, facilitates successful use in the environment and prolongs the useful life of herbicide products. Knowing herbicide modes of action also allow for troubleshooting problems with herbicides, including diagnosis of drift, carryover, or misapplication. The presentation will review the common modes of action used in range/pasture/wildlands, including the herbicides behave in plants, and then discuss how to use such information to minimize or mitigate herbicide resistance. 10:25 – 11:25 PM Ventenata and Medusahead Jaycie Arndt (University of Wyoming Extension Educator) Ventenata, Ventenata dubia (Leers) Coss., and medusahead, Taeniatherum caput-medusae (L) Nevski., were identified in Sheridan County, Wyoming in the summer of 2016. Shortly after, the Northeast Wyoming Invasive Grasses Working Group (NEWIGWG) was established as a multi-stakeholder group that implemented an Early Detection Rapid Response (EDRR) approach for managing both annual invasive grasses. Contribution in the group has expanded since formation to include input from private landowners, NGO’s, and local, state, and federal agencies across multiple counties in Wyoming and coordination with stakeholders in neighboring states. The group’s goals are to prevent further spread of invasion, reduce seed transport, raise community awareness, better understand the population ecology of both species, and implement treatments to control current self-sustaining populations. Efforts were 1
taken to build a containment strategy for ventenata populations from spreading outside a three- county area in northeast Wyoming. The goal for medusahead control was based on eradication of the smaller population located in only Sheridan county. As of fall 2020, 42,600 acres have been surveyed for ventenata and medusahead, 38,000 acres have been treated with indaziflam, and 7000 acres have been post-treatment monitored. The group continues to concentrate on best-management practices, methods testing, data collection, treatment, and now also focuses on monitoring, mapping, and effective retreatment. 11:25 - 120 PM Lunch Break 12:30 – 1:35 PM Finally Things are Changing in Weed Biological Control: Release Petitions and New Agents Mark Schwarlander (Professor of Entomology, University of Idaho) This presentation will provide attendants with information about advances in biological weed control research and the TAG release decision process, which has enabled new petitions and release permits of biological weed control agents to go forward. We will discuss the new data that we try to collect to demonstrate that agents are safe and how they are perceived by the federal agencies tasked with release decisions. Attendants will also learn about the complex approval process and pending and recently approved petitions for biological control agents for houndstongue, dyers woad, hoary cress and other weeds. Finally, attendants will be updated about efforts on the biological control of rush skeletonweed, for which – in addition to existing biological control agents – a newly discovered large buprestid beetle is being investigated. 1:40-2:40 PM Systems Approach to Herbicide-Resistance Management Albert Adjesiwor (University of Idaho) Evolution of herbicide resistant weeds continues to erode our ability to control weeds in crops. In this presentation, I will discuss new and existing approaches to manage herbicide-resistance weeds. This includes but not limited to: cover-crops, crop rotation and diversity, herbicide mixtures, harvest weed seed control, weed seedhead suppression, and precision weed control technologies. In addition, I will demonstrate how the Herbicide Diversity Calculator, an interactive web app that estimates the risk of herbicide resistance can be used as a decision aid to reduce the selection for herbicide-resistant weeds. 2:45 – 3:45 PM Presentations from Travis Fuller and Jim Bean with fill one-hour time slot. Terrestrial Weed Control in and Around Water (1/2 hour presentation) Travis Fuller (SePro Corp) Shoreline weed control for ponds, lakes, and ditch banks. Discuss products, application, and whether treatments are more effective pre or post emergent. Also covers products for submerged plants in pond, lakes, and ditches. Optimize Your Cheatgrass and Medusahead Control Program with Plateau (1/2 hour presentation) Jim Bean (Strategic Accounts Manager, BASF) This presentation will review how to get the best performance from Plateau herbicide to control Cheatgrass and Medusahead. We will review the correct timing, rates and environmental conditions necessary for maximum performance. We will also directly compare the strengths and weaknesses of Plateau to Rejurva. 2
Thursday, January 14, 2021 8:15-9:15 AM Principles of Plant Ecology and Weed Management Jane Mangold (Montana State University) Theories in plant ecology can be developed into principles or “rules of thumb” to guide integrated weed management. A seasonal priority effect is one such theory that can guide timing of herbicide applications and seeding to restore range and pastures that are degraded by winter annual grasses like cheatgrass and ventenata. This presentation will share results from three studies conducted over nearly a decade that show spring application of the non-selective, no residual herbicide glyphosate can be integrated with spring seeding of the native grass bluebunch wheatgrass to restore weed-infested range and pasture. 9:20 – 10:20 AM Presentation from Kent Pittard and Trent Brusseau will fill one-hour time slot RejuvraTM – Advanced Control for the Restoration and Protection of Rangeland, CRP Land and Natural Areas (1/2 Hour Presentation) Kent Pittard (Area Sales Manager, Bayer Vegetation Management) Long-term control with Rejuvra results in invasive annual grass soil seedbank depletion. Benefits to users include: For ranchers, Rejuvra can provide increased perennial biomass and forage production. Restoration of native plant communities and decreased fine fuels associated with wildfires. Increased wildlife habitat quality and pollinator habitat. Also, an effective tool for managing herbicide-resistant weeds. Concurrent changes to the Esplanade® 200SC label will be briefly reviewed. Milestone Family of Herbicies for Noxious Weed Programing (1/2 hour presentation) Trent Brusseau (Rangeland & Land Management Specialist, Corteva Agriscience) Rinskor is a new active ingredient for Range & Pasture/Land Management. Will be talking about how this product is an a Group 4 but it has activity on a brand new auxin receptor that no other group 4 does. This will be sold under the brand names of DuraCor and TerraVue. Will be talking about use sites, rates, timings, ppe and new class of weeds that are on the label that are not on Milestone. 10:25 – 11:25 AM Aquatic Noxious Weed Identification, Survey and Prevention in ID Bethany Muffley (ISDA) & Jeremey Varley (ISDA) Jeremey and Bethany will introduce the topic of aquatic noxious weeds, the threats posed to Idaho waterways, and actions that can be taken upon discovery. This presentation will teach identification of state-listed aquatic noxious weeds, survey techniques utilized to develop management actions, and control options available. It will also provide participants with a brief overview of ISDA’s Watercraft Inspection program with highlights of the steps that are being taken to prevent the introduction and/or spread of aquatic noxious weeds in Idaho. 11:25-12:30PM LUNCH BREAK 3
12:30 – 1:30 PM Russian Olives and Management Options Danielle Gunn (U of I, Fort Hall Extension) Russian olives are distinct, fast growing trees that are very adaptable to a variety of environmental conditions. They were introduced to North America in the 1920s. They can be effective in windbreaks and provide food and shelter for some animal species. They are now considered very invasive across much of the Inland Pacific Northwest. Russian olives displace native vegetation and decrease native plant, animal, and insect diversity. These trees contain a microbe associated with nitrogen fixation. This process enables trees to self-fertilize and establish on bare soil. This feature also increases algae growth and reduces oxygen levels in water. Control measures are labor intensive and difficult. Mechanical removal, combined with herbicide treatments, provides the most effective control. 1:35-2:35 PM Presentation from Jon Storr and George Severson will fill one-hour time slot Selective and Bare Ground Weed Control (1/2 hour presentation) Jon Storr (Territory Manager, Nufarm) I will cover some herbicides programs to maintain total vegetation control in industrial areas and roadsides as well as discuss controlling unwanted broadleaf noxious and nuisance weeds using selective herbicides. As a review, we will look at some products currently in use such as Piper, Payload, E-2, Aquasweep, Veteran 720 and Weedar 64. We will also look at field trials and there will be before and after photos. Selective Weed Control and Total Vegetation Management from Alligare (1/2 hour presentation) George Severson (Market Development Specialist/Technical Resource, Alligare) The tenets of integrated pest management or integrated weed management are based in our current understanding of succession where site availability, differential species availability, and differential species performance drive secondary succession. Weeds typically are ruderal plants – although perennial weeds may possess a more mid-seral tendency – but all respond positively to disturbance due to increased resources released from plants that succumbed to the disturbance, especially increased nitrate nitrogen. The most important aspect of selective weed control as part of an integrated weed management approach is competition from desirable members of a plant community. Often, a single management input in the form of judicious herbicide use can alter the successional trajectory of a disturbed parcel by impeding weed growth and simultaneously providing opportunity to desirable plant species that enhances their growth and occupies sites formerly occupied by the weeds thus, creating an integrated or successional weed management strategy. Total vegetation management (TVM), or bare ground control, relies solely on herbicides to achieve the land management goal of zero vegetation in particular settings for public safety and ease of management of industrial sites. Practitioners of TVM must carefully plan for and choose herbicides that effectively control known target weeds for optimum time periods, usually for a growing season, and also include herbicides that will inhibit the development of weed herbicide resistance. Alligare has a very broad portfolio of herbicides for selective control and for components of TVM programs. Using yellow toadflax (Linaria vulgaris) as an example for selective control, previous research demonstrated that chlorsulfuron at 1.75 oz/A applied when at least 75% of the toadflax shoots present in a stand had gone through 4
the reproductive stage of growth controlled 95 to 98% of yellow toadflax 2 years after herbicides were applied; and this success was also due to little to no injury to the desirable plants present at the site that occupied vacancies created by controlling the target weed. The optimum timing based upon weed growth stage also accounted for rapid root growth where adventitious root bud growth was increasing to a maximum presence creating a strong sink for herbicide translocation. Herbicide use for best Russian knapweed control also is based upon growth stage and maximum adventitious root bud growth. Alligare’s flumioxazin (PPO inhibitor) + imazapyr (ALS inhibitor) and flumioxazin + imazapic (ALS inhibitor) are examples of bare ground programs that consistently provide excellent bare ground control for 4 to 5 months. These programs can be augmented with other herbicides with different sites of action, such as auxinic herbicides or HPPD inhibitors, to control weeds resistant to ALS or PPO inhibitors known to be present at bare ground target sites; thus, creating commercially excellent bare ground even in the presence of herbicide resistant weeds. 5
You can also read