Control of Bollworm and Cotton Flea Hopper by DDT

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Abstract
Cage expts. conducted at Waco, Tex., during 1945 showed that DDT in atomized Diesel-oil Sprays gave a quicker kill of bollworms, Heliothis armigera, than did DDT-pyrophyllite dusts, but there were no important differences at the end of the standard 5-day test period. In field-plot expts. both 5 and 10% DDT gave better bollworm control than 2.5% DDT or cryolite-sulfur. Fused DDT-sulfur dust was compared with simple DDT-sulfur dust against bollworms and cotton flea hoppers {Psallus seriatus). In most of the expts. the control obtained, or yields secured were slightly in favor of the fused mixtures. DDT-sulfur mixtures gave the most outstanding flea hopper control ever observed in field expts. DDT did not give satisfactory control of the boll weevil, Anthonomus grandis. In one expt., 6 applications of DDT caused marked increase in populations of the red spider, Tetranychus sp. Cotton aphids {Aphis gossypii) increased following use of a DDT-calcium arsenate mixture than following use of either material alone. Addition of 1% nicotine to DDT mixtures prevented aphid build-up. A large-scale expt. designed to obtain maximum gains from both bollworm and boll weevil control using DDT-sulfur and Ca arsenate produced a gain of 1119 lb. per acre from the combination control.

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