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Implications of the Endangered Species Act on Pesticide Applications in Illinois

  • April 7, 2023

Pest management practitioners will increasingly find changes to many pesticide labels as the United States Environmental Protection Agency (EPA) begins to implement requirements mandated by the Endangered Species Act (ESA). We encourage all who are involved in pest management disciplines (farmers, applicators, scientists, etc.) to become more familiar with the ESA and how the EPA proposes to meet the agency’s requirements under ESA when registering or reregistering pesticides.
Dr. Lee Van Wychen is the Executive Director of Science Policy for the Weed Science Society of America (WSSA).…

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US EPA Issues New Dicamba Application Restrictions for Illinois Soybean

  • February 17, 2023

The United States Environmental Protection Agency (US EPA) issued new state-specific application restrictions for dicamba-containing products labeled for use in Illinois dicamba-resistant soybean varieties. The three dicamba products (i.e., XtendiMax, Engenia, Tavium) cannot be applied after June 12 or the V4 soybean growth stage, whichever comes first. We remind applicators these new restrictions are in addition to the existing application restrictions imposed by the Illinois Department of Agriculture that include:

  1. A pesticide containing dicamba shall not be applied on soybeans if the air temperature at the field at the time of application is over 85 degrees Fahrenheit or if the National Weather Service’s forecasted high temperature for the nearest available location for the day of application exceeds 85 degrees Fahrenheit.

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Fall-Applied Herbicides: Which Weed Species Should be the Target?

  • October 27, 2022

Herbicides applied in the fall often can provide improved control of many winter annual weed species compared with similar applications made in the spring. Marestail is one example of a weed species that is often better controlled with herbicides applied in the fall compared with the spring. An increasing frequency of marestail populations in Illinois are resistant to glyphosate, and resistance to ALS-inhibiting herbicides also is present in Illinois populations. Targeting emerged marestail with higher application rates of products such as 2,4-D in the fall almost always results in better control at planting compared with targeting overwintered and often larger plants with lower rates of 2,4-D in the spring.…

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Weed Control in Wheat Stubble Fields

  • July 12, 2022

Wheat harvest marks the end of one cropping cycle and the beginning of a second. In parts of central and southern Illinois, farmers frequently opt to plant double-crop soybean following wheat harvest, with hopes that the first “killing” frost will be late enough to allow the soybean to reach maturity. Wheat stubble fields not planted with a second crop often become populated with a “crop” of summer annual (and sometimes perennial) weed species. Unlike double-crop soybean,…

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Residual Soybean Herbicides Applied Postemergence

  • June 1, 2022

Soil-residual herbicides are important components of integrated weed management programs. Reducing the number of weeds exposed to foliar-applied herbicides helps reduce the selection intensity for weeds resistant to foliar-applied herbicides. Residual herbicides applied with postemergence soybean herbicides also can reduce the need for a second postemergence application. However, simply applying a soil-residual herbicide does not guarantee the product will provide the desired level or duration of weed control. Many edaphic and environmental factors influence the level of weed control achieved by soil-residual herbicides.…

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Soil-Residual Herbicides Applied to Emerged Corn

  • May 19, 2022

A potential scenario of planting delays will be corn planted in fields where no soil-residual herbicide was applied. If the corn has not yet emerged, the soil-residual herbicide can be applied as originally planned. But, what if the corn has emerged and the soil-residual herbicide has not been applied? Can the application proceed as planned, or will a different product need to be selected? The answer depends on the respective herbicide.
Most, but not all, soil residual herbicides can be applied after corn has emerged.…

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Emerging Crops and Delayed PRE Herbicide Applications

  • May 16, 2022

Soil-residual herbicides are important components of integrated weed management programs. Labels of many single and multiple active ingredient products allow application before and after crop emergence, but other active ingredients can cause severe crop injury if applied to emerging crop plants. In fields where a PRE herbicide application has been delayed and corn or soybean are beginning to emerge, the following active ingredients (applied either alone or as a premix product) or commercial products should not be applied:
saflufenacil (Sharpen and Verdict,…

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2022 Weed Control Guide Now Available

  • January 10, 2022

The 2022 Weed Control Guide for Ohio, Indiana and Illinois contains 232 pages of weed management information, including weed response ratings for corn and soybean herbicides.  Information and recommendations for managing weeds in small grains and forages are included, along with specific information about, and control recommendations for, several problem weed species.  The 2022 Weed Control Guide is available in pdf or print format and can be ordered at:

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Preharvest Intervals for Herbicides Applied Postemergence in Soybean

  • July 12, 2021

Nearly all herbicide labels (soil-applied or postemergence) have rotational crop intervals that specify the amount of time that must elapse between herbicide application and planting a rotational crop.  This becomes particularly important with late-season herbicide applications, and when soil moisture is limited. Additionally, the labels of almost all postemergence soybean herbicides indicate a preharvest interval or a soybean developmental stage beyond which applications cannot be made.  Labels of some products may indicate both a developmental stage (before soybean bloom,…

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Reminder: University of Illinois Weed Science Field Research Tour

  • June 17, 2021

The weed science program at the University of Illinois invites all weed management practitioners to our annual weed science field tour on Wednesday, June 23 at the Department of Crop Sciences field research location known as the Clem Farm, located at 1114 County Road 1200 East, Champaign. Registration begins at 7:30 a.m. and the tour will start at 9:00 a.m. Preregistration is not required, but please let us know in advance if you will be bringing a large group of participants so we can plan accordingly for meals.…

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