Studies on the Control of Thrips Attacking Onions1

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Abstract
Data from 3 spray tests indicate that a combination of Frankliniella occidentalis and Thrips tabaci did not reduce onion yields at the infestation levels resulting from various spray treatments during the growing season. In tests conducted during 1960-61 the following insecticides showed promise of being efficient thrips toxicants Shell Development Compound 4402 (1,3,4,5,6,7,8,8 octachloro 3a,4,7,7a-tetrahydron-4,7-menthanophthalan); Trithion (S-(p-chloro-phenylthio)methyl O,O-diethylphosphorodithioate); Guthion (O,O-dimethyl S-4-oxo-l,2,3-benzotriazine-3-(4H)-ylmethylphosphorodithioate); Thiodan (6,7,8,9,10,10-hexachloro-l,5,5a,6,9,9a-hexahydro-6,9-methano-2, 4,3,-benzodioxathiepin-3-oxide); Zectran (4-dimethylamino-3,5 xylyl methylcarbamate); and Bayer 29493 (O,O-dimethyl O-[4-(methylthio)-m-tolyl] phosphorothioate).

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