Some Organic Insecticides for Control of Plum Curculio on Peaches1

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Abstract
Two years'' field expts. show at least 79% of dropped peach fruits to be injured by plum curculio, Conotrachelus nenuphar. Benzene hexachloride and parathion were superior to lead arsenate in reducing the loss of fruits as drops and in reducing the total injury to the crop. Chlordan was superior to 2 applications of lead arsenate in reduction of drops and as good as lead arsenate in reducing total injury. Chlorinated camphene caused as much loss of dropped fruits as lead arsenate. Two applications of 2 lbs. of 25% chlorinated camphene were as effective in control as 2 applications of lead arsenate and were significantly superior to 2 applications of 1 lb. of chlorinated camphene. Chlorinated camphene should be tested further at higher concns. Two applications of lead arsenate were superior to one application, which was of little or no value. Benzene hexachloride, parathion, and possibly chlordan appear to be toxic to newly hatched larvae or eggs as well as adults. No injury to the foliage, fruits, buds, or tree was observed with any of the organic insecticides used. Benzene hexachloride did not flavor the fruit at harvest.

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