Field Tests with Sprays for the Control of Thrips and the Cotton Fleahopper

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Abstract
Insecticides applied to cotton as sprays were tested in several small-plot and large-scale field expts. conducted at Waco, Texas during 1952 for the control of thrips, Frankliniella spp., early in the season and the cotton fleahopper, Psallus seriatus during the midseason period. Studies of infestations of the bollworm, Heliothis armigera after the appln. of insecticides for cotton fleahopper control were made. The following insecticides and per-acre dosages gave the most effective thrips control: dieldrin, 0.0625 lb. and 0.1 lb.; Toxaphene, 0.75 lbs.; aldrin, 0.125 lb.; heptachlor, 0.125 and 0.25 lb.; and EPN, 0.25 lb. Residual control was not so good with BHC, 0.15 lb. gamma plus DDT, 0.25 lb; BHC, 0.15 lb. gamma; EPN, 0.125 lb.; endrin, 0.1 lb.; and isodrin, 0.1 lb. Good initial kill of the cotton fleahopper was obtained with Toxaphene, 0.75 lb.; dieldrin, 0.1 lb.; aldrin, 0.125 lb.; heptachlor, 0.125 lb.; endrin, 0.1 lb., isodrin, 0.1 lb.; BHC, 0.15 lb. gamma plus DDT, 0.25 lb.; and EPN, 0.125 lb. The best residual control of the insect was obtained with Toxaphene, dieldrin, endrin, and gamma BHC plus DDT; residual control obtained with aldrin, heptachlor, EPN, and isodrin was poor. Boilworm injury after 1 appln. of EPN at the rate of 0.125 lb./acre for midseason cotton fleahopper control was significantly higher than after 1 appln. of Toxaphene, 0.75 lb.; aldrin, 0.125 lb.; and endrin, 0.1 lb.

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