The safener isoxadifen-ethyl confers fenoxaprop-p-ethyl resistance on a biotype of Echinochloa crus-galli.

Background: Some herbicides are commercially formulated with safeners to increase crop selectivity. Fenoxaprop-p-ethyl is formulated with the safener isoxadifen-ethyl for Echinochloa crus-galli control in rice. Safeners act on crops by increasing herbicide metabolism, but this effect may also occur in weeds.