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Waterhemp not forming resistance to dicamba, glufosinate yet

Researchers at the University of Missouri say waterhemp, so far, is not developing resistance to dicamba or glufosinate.  

MU Extension Weed Scientist Kevin Bradley tells Brownfield his team’s ongoing study is screening more than 200 waterhemp populations across seven Midwestern and Southeastern states including Missouri, Illinois, Indiana, Nebraska, Ohio, Louisiana and Tennessee. 

“In just two years of data, luckily, I look at it and I don’t see any major, big change that really concerns me like more survival in year two compared to year one,” Bradley said.

He said the study proactively looks at how waterhemp is adapting to dicamba and glufosinate. While Bradley said the weed isn’t resistant to the herbicides yet, he cautions that high usage levels of the herbicides will likely cause waterhemp to build resistance.  

“Anytime we have as many millions of acres that are relying on these post-emergence herbicides for the control of one weed: waterhemp, those are the times in our past which haven’t turned out so good from a resistance standpoint,” Bradley said.

The United Soybean Board is funding the MU study. 

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