AgFax Weed Solutions: Latest Herbicide Strategies And Developments

Highboy spraying seedling corn. ©Debra L Ferguson

Here is this month’s issue of AgFax Weed Solutions, sponsored by Nufarm’s Midwestern and Southern teams.
Editor: Owen Taylor
Web Editor: Ernst Undesser
  • Dicamba Movement: Predicting Inversions Proves Quite Tricky
  • Cover Crops And Horseweed Control: Holding Back Multiple Flushes
  • Dicamba: Pigweed Punches Back
  • Ohio Soybeans: Tempted To Omit Residuals? Maybe You Need A Good Thumping
  • Arkansas Rice, Corn: Coping With Rain And The Weeds That Emerge After Burndown
  • Iowa: How To (Or Whether To) Integrate Residuals With Cover Crops
  • Louisiana Corn: Burndown Considerations for Wet Spring – Podcast
  • Dicamba: EPA Watchdog Rechecking Registration And “Local Need” Labels
  • Tennessee: Prepping for 2020 Weed Management – Podcast
  • North Carolina: How Those Weed Seeds Journey Between Regions – Video
  • Iowa: Sprayer Maintenance Tips Ahead Of Spring Herbicide Applications
  • Weed Research: Breakthrough Allows Researchers To Fly Through Laborious Seed Counts
  • ALSO: Three Timely Reports You Might Have Missed
Researchers in a multi-state project are trying to sort through all the variables that trigger temperature inversions. They find, among other things, that inversions often take shape during allowable application periods.
Fall-sown cover crops are actively growing during periods of fall and spring horseweed emergence periods and, due to competition, have the potential to reduce establishment rates and slow growth rates of fall- and spring- emerging horseweed.
“I called the farmers and retailers who found some of these (Palmer pigweed escapes) and I told them, ‘Dicamba isn’t going to control Palmer amaranth in these fields anymore.’”
For anyone who things new technology will handle all the weeds, perhaps an intervention is warranted – where the stubborn person is repeatedly thumped with a stick while being reminded of what happened the last time they opted out of residuals.

Even after excellent burndown sprays early on, rain-related delays have allowed a new flush of weeds that must be controlled. Your options on a “come-back” basis vary with the crop, the timeframe and the weeds.
Should you include a residual in the tank when terminating cover crops? How much of the herbicide makes it to the soil depends on several factors, as Midwestern weed scientists find.
Dennis Burns and Daniel Stevenson discuss burndown and other weed management considerations for Louisiana corn growers with the cold, wet weather so far this year in this episode of the Louisiana Delta Crop Report Podcast.
The purpose of the investigation will be to “determine whether the EPA adheres to federal requirements and scientifically sound principles for the 2016 registration and 2018 renewal for the new uses of the dicamba herbicide.”
Questions about preemergent grass control in Southern field crops this spring? Larry Steckel, Tennessee Extension Weed Specialist, has sorted through a round of calls and texts on how to gain the upper hand. In this podcast, he also reports on the latest technology and trends covered at the recent Weed Science Society of American conference.

In this short but fascinating video, North Carolina Extension Weed Specialist Wesley Everman recounts a couple of instances where he pinpointed how two pernicious weeds – Palmer pigweed and herbicide-resistant waterhemp – made it to specific parts of the state.
Before you invest money in herbicides, invest a little time and effort to ensure those materials work according to specs.
Starting with Palmer pigweed, researchers from Arkansas, Alabama and North Carolina brought a new form of technology into the tedious process of counting weed seeds. This promises to significantly streamline research and treatment comparisons.

Three Key Reports You Might Have Missed
Auxin herbicides, such as 2,4-D and dicamba, are showing their antagonistic side. Contact herbicides like glufosinate can cause problems, too. Problems, in particular, are working against grass control.
Weather issues may complicate herbicide programs in 2020, plus many growers will have to contend with prevented-planting acres – potentially, a significant challenge.
Spraying with 2,4-D can be harmful to dicamba-tolerant cotton and spraying with dicamba can cause injury to 2,4-D-tolerant cotton, resulting in yield and economic losses for the cotton producer. Can you “heal” this kind of crop injury? Researchers looked at several options.


AgFax Weed Solutions is published by AgFax Media LLC. If you’re receiving this newsletter from us, either a friend or business contact asked us to forward the report to you or you are a regular subscriber to one of our crop, pest and issue-related reports covering states in the Corn Belt, South, Southwest and Far West.

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Questions? Contact Owen Taylor, 601-992-9488

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