Studies of insecticide assays and spray deposit recovery in relation to the false codling moth, Cryptophlebia leucotreta Meyrick (Lepidoptera: Tortricidae; subfamily olethreutinae)

Abstract

Insecticide assays using larvae of Cryprophlebia Ieucotreta Meyrick (Lepidoptera: Tortricidae; subfamily Olethreutinae) showed that parathion-methyl and monocrotophos were more toxic than fenitrothion and endosulfan. The LD9,, were 3.44 mg/kg and 11.0 mg/kg for parathion-methyl and monocrotophos, respectively. The order of relative efficiency of the insecticides was as follows: parathion-methyl, monocrotophos, fenitrothion and lastly endosulfan.When different spray machines were tested for spray deposition on well grown cotton plants, the motorised airblast sprayer effected a more satisfactory deposit recovery on the lower parts of the cotton plants where early and heavy infestation of C. Ieucotreta to the mature cotton bolls occurs.