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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 and Corteva can develop new ones to fight them.

Kochia, which spreads as many as 30,000 seeds per plant, can cut yields by up to 70% if left unchecked

Kochia, which spreads as many as 30,000 seeds per plant, can cut yields by up to 70% if left unchecked

WINNIPEG, Manitoba/CHICAGO, Jan 16 - C rop-killing weeds such as kochia are advancing across the U.S. northern plains and Midwest, in the latest sign that weeds...

Weeds are developing resistance against multiple herbicides, scientists warn

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 and Corteva can develop new ones to fight them.