Common lambsquarters developed resistance to Group 5 herbicides (triazines) very early on in the history of herbicide resistance. It was first confirmed in the US in 1975 infesting corn, soybean, and nurseries. The species is very common throughout many regions of the US.
Herbicide resistant populations:
- Group 5
Locations of resistant populations:
Delaware, Illinois, Iowa, Maryland, Michigan, Minnesota, Kentucky, Pennsylvania, Tennessee, North Carolina, Virginia