Revenge of the Weeds

Plant pests are evolving to outsmart common herbicides, costing farmers crops and money.

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Corn fieldsWIKIMEDIA COMMONS, GARDENKITTY

It’s a story suited for a Hollywood horror film, yet it’s also a tenet of evolutionary biology. Introduce a toxin to a system, and you inevitably select for resistant survivors. These few individuals gain a reproductive advantage and multiply; sometimes they can’t be stopped with even the most potent chemicals.

For years, this general plot line made headlines in the fields of antibiotic resistance and cancer research. More recently, plants have become a common protagonist. Weeds around the world are developing resistance to glyphosate—one of the most common herbicides on the market—and like bacteria and tumor cells, many plants can also withstand multiple other toxins, each with unique molecular targets.

In January, a hair-raising infestation of the kochia shrub was confirmed in Alberta, Canada. Originally ...

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  • Amy Coombs

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