Benzene Hexachloride and DDT to Control Plum Curculio

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Abstract
In an orchard expt., better control of plum curculio on peaches was obtained from concns. of benzene hexachloride ranging from 0.05 to 0.2 lb. of [gamma] isomer per 100 gal. than from acid lead arsenate. The 0.2-lb. rate was significantly better than 0.05-lb., but there was no significant difference between 2 and 4 applications of the 0.2 lb. rate. In a laboratory expt. the amts. of benzene hexachloride calculated to kill 50% of the adults within 2-, 4-, and 8-day periods, respectively, were 0.32, 0.233, and 0.174 lb. of [gamma] isomer per 100 gal. Similarly, from 0.779 to 0.816 lb. of [gamma] isomer per 100 gal. was the amt. required to obtain 95% mortality in 4 - 8 days. Less than 50% were killed within a period of 8 days by acid lead arsenate. Very little control of larvae was obtained from field and laboratory soil applications of DDT at 10 and 25 lb. and benzene hexachloride at 0.5 lb. per acre; however, soil applications of benzene hexachloride at 1 lb. per acre gave approx. 60% control.

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