At the same time that many U.S. soybean farmers are battling herbicide-resistant weeds, now they have another issue for which their previous management methods may no longer work – fungicide-resistant diseases.
The evolution and widespread distribution of herbicide-resistant weeds and their management is a challenge for crop producers and land managers. The evolution of herbicide-resistant weeds is not new. The first report dates back to 1970, when common groundsel (Senecio vulgaris) resistant to atrazine was confirmed in Washington. Recently, multiple-resistance was confirmed in Palmer amaranth (Amaranthus palmeri) in a continuous seed corn production field in Nebraska.
After receiving registration approval from the U.S. Environmental Protection Agency (EPA), DuPont Crop Protection has introduced DuPont Afforia herbicide, a preplant herbicide for soybeans and other field crops that provides excellent burndown and residual control of many of the most challenging weeds.
Spurred by late spring and early summer rainfall, farmers’ row crops across much of Kansas are thriving. And so are the weeds they’re trying to control, including Palmer amaranth, an aggressive and invasive weed that used to be controlled by the popular herbicide glyphosate.
Herbicide-resistant waterhemp populations continue to expand into more areas of Illinois each season. Waterhemp has evolved resistance to herbicides encompassing more mechanisms of action than any other Illinois weed species.
An invasive weed that has put some southern cotton farmers out of business is now finding its way across the Midwest – and many corn and soybean growers don't yet appreciate the threat, University of Illinois researchers report.