Evaluation and efficacy of pest management modules for cucur-bits against fruitfly, Bactrocera cucurbitae (Coquillett) in Andaman.
Fruit fly (Dacus cucurbitae) is a major pest of cultivated cucurbits. Among cucurbits, incidence was more in bitter gourd and ridge gourd as compared to other cucurbitaceous vegetables. IPM module has been developed for the successful management of cucurbit fruit fly. Integrated Pest Management (IPM) module comprising of installation of cue-lure baited traps @ 50 traps/ha for mass trapping, weekly clipping of infested fruits, foliar spray of aqueous leaf extracts of Morinda citrifolia @ 100 g/l and foliar spray of spinosad 45SC or imidacloprid 17.8SL @ 0.3 ml/l alternately at 15 days interval was found effective with respect to less fruit damage due to fruit fly (9%) and maximum fruit yield (10.75 t/ha) in bitter gourd as compared to untreated control (39.3% fruit damage and fruit yield 5.53 t/ha). The same trend was also noticed in ridge gourd also. IPM module was found better with respect to less fruit damage (5.9%) and maximum fruit yield (7.59t/ha) in ridge gourd. The yield in untreated control plots was recorded 3.46t/ha. IPM module for cucurbit fruit fly gave higher cost benefit ratio of 1:3.35 in IPM and 1:2.30 in non-IPM fields of bitter gourd and 1:1.99 in IPM and 1:1.23 in non-IPM fields of ridge gourd, respectively. IPM module for cucurbit fruit fly gave higher incremental cost benefit ratio of 1:3.35 in IPM and 1:2.30 in non-IPM fields of bitter gourd and 1:1.99 in IPM and 1:1.23 in non-IPM fields of ridge gourd, respectively. By using these management practices, application of synthetic insecticides can be reduced and lower the risk to people, wildlife and the environment.