Abstracts for Idaho Noxious Weed Virtual Conference January 13-14, 2021 - IDAHO NOXIOUS WEED CONTROL ASSOCIATION
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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
1taken 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.
2Thursday, 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
312:30 – 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
4the 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.
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