An herbicide that reduces chlorophyll and carotenoid levels in plants; used to control grasses and broad-leaved weeds; toxic to certain aquatic wildlife (LC50 = 7.32 mg/L for silver catfish); decreases AChE activity in brain and muscle tissue of the silver catfish (83 and 89% inhibition, respectively) when used at concentrations of 5, 10, and 20 mg/L; increases AChE activity in teleost fish muscle