Effectiveness of Insecticides Against the Corn Leaf Aphid in Sorghum Whorls1

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Of 21 insecticides tested for control of the corn leaf aphid' Rhopalosiphum maidis (Fitch), infesting sorghum whorls, the most effective were granular formulations of phorate; Di-Syston®, O.O-diethyl S-[2-(ethylthio)ethyl] phosphorodithioate; Telodrin® 1,3.4,5,6,7,8,8-oetaehloro-1.3,3a ,4,7,7a-hexahydro-4, 7-methanoiso benzofuran; and endosulfan. When the same chemicals were used in both spray and granular formulations, the latter were much more effective, probably because of the deeper penetration of the insecticide into the whorls where the aphids feed.

Document Type: Research Article

Publication date: February 1, 1964

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