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The fundamental effect herbicides have on plant biochemistry is called the mode of action. After spraying, weeds are controlled by a cascade of biochemical events that generate various symptoms of abnormal growth and development.

Palmer amaranth (Amaranthus palmeri) is an aggressive broadleaved weed that has become a severe problem in crops such as cotton, maize and soybeans across the US. Twenty-five years ago, it was a minor weed of little concern, but today some...

Blackgrass (Alopecurus myosuroides) resistance has plagued cereal growing in Northern Europe since the early 1980s. In the UK it is reckoned that resistant populations exist on virtually all farms where any blackgrass herbicide has been us...