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University of Illinois Weed Science Field Research Tour

  • May 27, 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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Corn Growth Stages and Postemergence Herbicides – Size IS Important

  • May 10, 2021

The labels of most postemergence corn herbicides allow applications at various crop growth stages, but almost all product labels indicate a maximum growth stage beyond which broadcast applications should not be made, and a few even a state minimum growth stage before which applications should not be made.  These growth stages are usually indicated as a particular plant height or leaf stage; sometimes both of these are listed.  For product labels that indicate a specific corn height and growth state,…

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Emerging Soybeans and Delayed PRE Herbicide Applications

  • April 26, 2021

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 soybean emergence, but other active ingredients can cause severe soybean injury if applied to emerging soybean. In fields where a PRE herbicide application has been delayed and soybean are beginning to emerge, the following active ingredients (applied either alone or as a premix product) should not be applied:
sulfentrazone (many Authority-based products,…

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Additional Illinois-Specific Dicamba Restrictions for Applications in Soybean

  • February 23, 2021

The Illinois Department of Agriculture recently announced additional restrictions for dicamba applications to soybean. In addition to the requirements of the federally-approved labels, all use on soybean of pesticides containing dicamba in Illinois shall comply with the following requirements:
Temperature Restriction: A pesticide containing dicamba shall not be applied on soybean 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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2021 Weed Control Guide Now Available

  • January 20, 2021

The 2021 Weed Control Guide for Ohio, Indiana and Illinois contains 236 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 2021 Weed Control Guide is available in pdf or print format and can be ordered at:

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Make Sure You Know ALL the Changes for 2021 Dicamba Applications in Soybean

  • January 14, 2021

In late October 2020, the United States Environmental Protection Agency (US EPA) announced new five-year registrations for the dicamba-containing products XtendiMax, Engenia and Tavium.  These labels include new and/or additional application restrictions that were not included on previous labels.  Annual dicamba-specific training (which we hope begins soon) offered by the product registrants will undoubtedly cover many/all of the new label changes, but there are a few changes that some currently might not be aware of and might come as a bit of a surprise. …

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A Statement from the Illinois Department of Agriculture regarding the mailing of unsolicited seeds

  • July 30, 2020

“We are currently working with USDA’s Animal and Plant Health Inspection Service (APHIS) to address reports of unsolicited shipments of seeds from foreign countries. Anyone who receives unordered seeds in the mail should contact the Illinois Department of Agriculture by emailing the following information to First and Last Name, Phone Number and the number of packages received. Do not open the package, plant the seeds, or throw them out. Please keep all seeds unopened and with their original packaging and labels,…

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Weed Control in Wheat Stubble Fields

  • July 7, 2020

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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Guidance for the Continued Use of Dicamba-Containing Products in Illinois

  • June 11, 2020

The Illinois Department of Agriculture recently issued a document containing guidance “to help pesticide dealers, commercial pesticide applicators and farmers understand the U.S. EPA order and the State of Illinois extension of the cut-off date for application.”  The document includes many frequently asked questions and how the Department interprets the guidelines from U.S. EPA for the continued use of existing stocks of these products whose registrations were vacated by a ruling of the Court of Appeals for the Ninth Circuit.…

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IDOA Statement on USEPA Cancellation Order-Use of Existing Stock

  • June 10, 2020

On June 3, 2020, in National Family Farm Coalition vs. U.S. Environmental Protection Agency, Case No. 19-70115, the United States Court of Appeals for the Ninth Circuit issued a ruling immediately vacating the registrations of Xtendimax, FeXapan and Engenia, all of which contain the herbicide dicamba. On June 8, 2020, the U.S. Environmental Protection Agency (EPA) issued a final cancellation order for these three dicamba products. The final cancellation order can be found here:

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