Cabbage Looper: Ovicidal Activity of Pesticides in the Laboratory1

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Abstract
Commercial formulations of 23 insecticides and fungicides were evaluated in the laboratory for ovicidal activity against 2 indigenous strains of the cabbage looper, Trichoplusia ni (Hübner). The laboratory strain had been reared continuously for ca. 3 yr while the field strain had been reared for 3–4 generations during the experiment. The field strain was more tolerant to the ovicides than the laboratory strain. Materials with most ovicidal activity were permethrin, Pydrin® (cyano (3-phenoxyphenyl) methyl-4-chloro-alpha-(l-methylethyl) benzeneacetate), methomyl, and chlordimeform. Other pesticides with lesser ovicidal activity (from lowest to highest LC50 of the field strain) were Mobil 9087 (l-ethoxy-4-{ 1-[4-(I, I-dimethylethyl) phenyl]-2-nitrobutyl} benzene), UC 51762 (dimethylester of N, N-[thiobis [(methylimino)carbonyloxy]] bisethanimidothioic acid), mevinphos, sulprofos, monocrotophos, and profenofos. Pesticides with no ovicidal activity were acephate, benomyl, chlorothionil, diflubenzuron, endosulfan, maneb, methamidophos, oxamyl, parathion, tetradifon, tetrasol, and triphenyl tin hydroxide.

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