Scientists have discovered how horseweed (Erigeron canadensis), a common weed in North America, is able to tolerate high levels of glyphosate, the active ingredient in many widely used herbicides. The findings, published in the journal Science, could lead to new strategies for controlling horseweed and other glyphosate-resistant weeds.

Horseweed is a major problem for farmers, as it can reduce crop yields by up to 30%. The weed is also becoming increasingly resistant to glyphosate, which is the most commonly used herbicide in the world.

In the new study, scientists from the University of Illinois found that horseweed has a unique mechanism for tolerating glyphosate. The weed produces an enzyme that breaks down glyphosate into a harmless compound.

This finding could lead to new herbicides that are more effective against horseweed and other glyphosate-resistant weeds. Scientists could also develop new crops that are resistant to glyphosate, which would allow farmers to use this herbicide without worrying about damaging their crops.

The study's findings are a significant breakthrough in the fight against glyphosate-resistant weeds. This discovery could help farmers to protect their crops from these destructive weeds and improve their yields.