Field Experiments on Insecticidal Control of Lepidopterous Larvae on Cabbage and Cauliflower1

Five experiments were conducted during 1961 and 1962 to compare the toxicity of a variety of insecticidal sprays to larvae of the cabbage looper, Trichoplusia ni (Hübner); the beet armyworm, Spodoptera exigua (Hübner); and the diamondback moth, Plutella maculipennis (Curtis) on cabbage and cauliflower. The cabbage looper appeared to be effectively controlled by American Cyanamid 48064 (2-(diethoxyphosphinothiolimino)-1,3-dithio-lane), Bayer 44646 (4-dimethylamino-m-tolyl N-methylcarbamate), endosulfan, Monsanto 40273 (O-propyl O-p-nitrophenyl methylphosphonothioate), Monsanto 40294 (O-phenyl O-pnitrophenyl methylphosphonothioate), and Zectran® (4-dimethylamino-3,5-xylyl methylcarbamate). In general, beet armyworms and diamondback moth larvae were more readily controlled by insecticides than were cabbage loopers.