Study on the combined impact of oil and different insecticides for control of mango leaf-gall midge Procontarinia matteiana (Dip:Cecidomyiidae)

The leaf gall midge is a serious pest of mango in Baluchestan. Mango leaf gall midge produces wart-like galls on leaves resulting in reduced photosynthesis, leading to leaf drop and lowered fruit production. Younger trees may die while older trees fail to recover normal growth after repeated attacks. In Kahir village a field experiment was conducted to test the efficacy of Five insecticides alone and in combination with oil against the mango leaf gall midge, when the new leaves sprouted. The treatments were Abamectin EC1.8%, Dimethoate EC40%, Malathion EC57%, Cyromazine WP75% and Acetamipride SP20%. In this study a completely random blocks design with 11 treatment and 4 replicates were tested in 2 years. To evaluate the effectiveness of the insecticides, the number of galls on the leaves was counted one day before spraying, 5 and 14 days after spraying. The results of insecticides application in two years showed a significant difference among treatments at level of 5%. Insecticides used were effective in reducing pest populations. Fourteen days after spraying of insecticides excellent control was obtained with Malathion alone (93.76%) and in combination with oil (98.75%) and trigard cyromazine (91.48%) in first year. Fourteen days after spraying of insecticides excellent control was obtained with Malathion alone (93.93%)and in combination with oil (94.90%) and trigard cyromazine (82.42%), Dimethoat(83.65%) and Acetamipride ( 83.12%) in second year. while one percent volk oil was markedly less effective.