Reuters
By Rod Nickel and Tom Polansek
January 16, 20246:43 AM EST
WINNIPEG, Manitoba/CHICAGO, Jan 16 (Reuters) – Crop-killing weeds such as kochia are advancing across the U.S. northern plains and Midwest, in the latest sign that weeds are developing resistance to chemicals faster than companies including Bayer (BAYGn.DE), opens new tab and Corteva (CTVA.N), opens new tab can develop new ones to fight them.
In many cases weeds are developing resistance against multiple herbicides, scientists said.
Reuters interviewed two dozen farmers, scientists, weed specialists and company executives and reviewed eight academic papers published since 2021 which described how kochia, waterhemp, giant ragweed and other weeds are squeezing out crops in North Dakota, Iowa, Wisconsin and Minnesota as chemicals lose their effectiveness.