Weeds

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. …

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: https://extensionpubs.osu.edu/2020-weed-control-guide-for-ohio-indiana-and-illinois/
 
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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. …

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,…

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.  These intervals are established to reduce the likelihood that herbicide residues will persist in sufficient quantities to adversely affect the rotational crop.  Some herbicide rotational restrictions are based solely on time, while other factors, such as soil pH and the amount of precipitation received after herbicide application,…

As a reminder, dicamba-resistant soybean fields that exist in counties that might harbor endangered terrestrial dicot plant species and that will be treated with dicamba must have an in-field, 57-foot omnidirectional buffer. The new 57-foot buffer will occur on three sides of the field and be in addition to the required 110-foot downwind buffer.  Non-sensitive areas, as defined in the renewed labels, can be included in the omnidirectional buffer calculation.  This new buffer requirement includes fields in at least 27 Illinois counties (Figure 1).…

Applying soil-residual herbicides with non-residual, foliar-applied herbicides can help reduce additional weed emergence following application and, therefore, reduce the need for another application later.  The “lateness” of this year’s soybean crop undoubtedly will decrease the number of acres where layered residuals are applied, but nonetheless keep in mind that labels for most soil-residual herbicides used in foliar applications include soybean growth stages or time intervals beyond which applications cannot be made.  Additionally, these labels include time intervals for rotational crops,…

SPRINGFIELD, IL – The Illinois Department of Agriculture (IDOA) announced today it will extend the application date the herbicide dicamba can be applied on soybeans in Illinois for the 2019 growing season until July 15. In February, the Department approved state-specific labels allowing for dicamba use on soybeans only until June 30.  Dicamba is primarily used on soybeans to control post-emergence broadleaf weeds.
“Due to the extraordinary wet weather seen in this state during the spring planting season and with still over 50% of the soybean crop to be planted,…

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,…