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Unwanted Plants Threaten Crops in North-Central US

Crop-killing weeds advance across US farmland as chemicals lose effectiveness

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.

Crop-killing weeds advance across US farmland as chemicals lose effectiveness

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

Crop-killing weeds advance across US farmland as chemicals lose effectiveness

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

Crop-killing weeds advance across US farmland as chemicals lose effectiveness

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.