Biochemistry Protoporphyrinogen oxidase inhibitor. Mode ofaction selective contact herbicide, absorbed more readily by thefoliage(and especially the shoots)than by the roots,with verylittle translocation.Uses control of annual broadleaved weeds andgrasses in a variety of tropical and subtropical crops,by pre- orpost-emergence application at rates in the range 0.25-2.0kga.i./ha. Particular crops include tree fruit(includingcitrus),vines,nuts,cereals,maize,soyabeans,peanuts,rice,cotton,bananas,peppermint,onions,garlic,ornamentaltrees and shrubs,and conifer seedbeds.