Each year we conduct extensive insecticide screening tests for control of the cabbage maggot (CM), an important soil pest of crucifer crops. Diazinon, a phosphate pesticide of limited persistence, is this State's single recommended material for CM control on direct-seeded cabbage and root crops; although with root crops it is necessary to suppress H. brassicae for the entire growing season which requires extended persistence. For transplanted cabbage, diazinon, Guthion, and Dyfonate are the recommended materials.