Control of Plum Curculio on Peaches with Benzene Hexachloride, Parathion, Chlordan and Lead Arsenate1

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Abstract
In New Jersey peach orchards in 1948, 2-5 sprays at 10-day intervals of benzene hexachloride at dosages of 0.09 to 0.24 lb. gamma isomer/100 gals. gave equal or appreciably better control (as measured by number of curculio-wormy drops per tree) than Parathion 0.25 lb., much better control than chlordane 1 lb., and very much better control than acid lead arsenate 2 lbs./100 gals. Evidence was obtained that the efficiency of benzene hexachloride spray powders is increased by reducing particle size or by the use of suitable spray coverage supplements, and that spray deposits of organic insecticides are more repellent to adults than those of acid lead arsenate plus hydrated lime. Benzene hexachloride 0.18 lb. gamma isomer/ 100 gals, was very effective in killing plum curculio larvae infesting peach fruits, whether the fruits were sprayed on the tree or after having dropped to the ground. Parathion and chlordane were considerably less effective in this respect at 0.25 lb. and 1 lb./lOO gals., respectively.

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