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Illinois Department Of Agriculture Statement on 9th Circuit Dicamba Ruling

  • June 5, 2020

On June 3, 2020, the United States Court of Appeals for the Ninth Circuit issued a ruling immediately vacating the registrations of Xtendimax, FeXapan and Engenia. The Ninth Circuit ruled that USEPA’s registrations of those products violated The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).  Pursuant to FIFRA, all pesticides sold, used, or distributed in the United States must be registered with the USEPA. Therefore, effective June 3, 2020, based on the Ninth Circuit’s ruling, Xtendimax,…

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Postemergence Herbicide Options to Manage Weeds in Dicamba-Resistant Soybean

  • June 5, 2020

The recent decision by the United States Court of Appeals for the Ninth Circuit to vacate the registrations of XtendiMax, Engenia and FeXapan has generated many questions about herbicide options to control weeds in dicamba-resistant soybean.  Tavium, a premixture of dicamba and S-metoachlor, remains in the marketplace and may be applied to dicamba-resisant soybean.  Keep in mind all restrictions with respect to application timing on the federal Tavium label (i.e., within 45 days of planting) and the Illinois 24 (c) label (i.e.,…

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Effective Immediately: No Additional Distribution, Sale or Application of Certain Dicamba-Containing Products

  • June 4, 2020

On June 3, the United States Court of Appeals for the Ninth Circuit issued their decision that effectively vacated the registrations of the dicamba-containing products XtendiMax, Engenia and FeXapan.  Since this ruling many questions have arisen, including the fate of these products already in the commercial channel.  During a recent conversation with officials at the Illinois Department of Agriculture, officials presented their interpretation of the court ruling as follows:
It is the current interpretation of the Illinois Department of Agriculture that the dicamba-containing products XtendiMax,…

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Replanting Dicamba Soybean

  • May 18, 2020

Replanting soybean fields or areas of fields likely will occur after soybean stand loss to recent cold temperatures or saturated soil conditions.  The following are general reminders about dicamba application timings and restrictions for Illinois soybean.

  • Air temperature restriction: do not apply approved dicamba-containing products if the air temperature in the field at the time of applications is greater than 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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Residual Soybean Herbicides Applied Postemergence

  • May 7, 2020

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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A Review of Early-Season Weeds

  • April 13, 2020

Ample soil moisture and warming temperatures are promoting rapid growth and development of many early-season weed species.  Most weeds currently growing in fields emerged last fall and successfully overwintered (winter annuals, biennials or perennials), but several early-season summer annual species recently have emerged.  Existing weed vegetation should be controlled before planting by utilizing tillage, herbicides, or a combination of tactics so the crop can become established under weed-free conditions.
Field scouting to identify the weeds present and their relative densities will provide the information needed to tailor a burndown herbicide program for any particular field. …

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Weeds and Their Management in 2020

  • February 5, 2020

No sooner have many unpleasant memories of the 2019 growing season begun to fade than we find ourselves looking ahead to contemplating potential residual weed management challenges in 2020.
Winter Annual Weed Species
Delays in planting the 2019 crop often accompanied delays in controlling existing stands of winter annual weeds prior to planting.  The obvious and unwelcome result was that seed production by winter annual species likely was a high in 2019 as any spring in recent memory. …

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2020 Weed Control Guide Now Available

  • January 23, 2020

The 2020 Weed Control Guide for Ohio, Indiana and Illinois contains 223 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 is included, along with specific information about and control recommendations for several problem weed species.  Printed and pdf versions of the 2020 weed control guide are available at:

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2019 Observations from the Field: Dicamba

  • August 2, 2019

Approximately two weeks ago, only a few (11 reported as of July 16) dicamba-related complaints had been filed with the Illinois Department of Agriculture (IDOA), and some held aspirations that the magnitude of off-target issues would be less this year than during the two previous seasons.  Today, it appears those hopeful aspirations are being replaced by the harsh reality that the magnitude of off-target issues in 2019 might be either similar to or possibly exceed those of previous seasons. …

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Reminder – University of Illinois Weed Science Field Research Tour

  • July 3, 2019

The weed science program at the University of Illinois invites all weed management practitioners to our annual weed science field tour on Wednesday, July 10.  Please note the tour will begin at our off-campus field location (“The Lost Forty”) which is located on Cottonwood Road (County road 1700 east) approximately one-quarter mile north of County road 1850 North (see map).
Registration will begin at 8:00 a.m. and refreshments (coffee, juice, and doughnuts) will be available.  Preregistration is not required,…

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