Comparative efficacy of some biopesticides and a pyrethroid against cucurbit fruit fly, Bactrocera cucurbitae (Coquillett) on Bitter gourd
Nazma Khatun, Mohammad Tofazzal Hossain Howlader, Tarikul Islam, Gopal Das
The efficacy of two bacterial fermented bio-pesticides (abamectin and emamectin benzoate), one insect growth regulator (lufenuron) and one newer pyrethroid (lambda-cyhalothrin) against the cucurbit fruit fly, Bactrocera cucurbitae (Coquillett) on bitter gourd was evaluated by field experiments. Two concentrations of the selected bio-pesticides were tested. A total of three sprays were applied and data were collected on different parameters viz. percent fruit infestation, number of marketable fruits/m2, infested and marketable fruit yield (t/ha) etc. Analysis of the results revealed that abamectin (Ambush 1.8EC) was found as the most effective one followed by emamectin benzoate (Suspend 5SG) while the insect growth regulator, lufenuron (Haron 5EC) was found as less effective against the B. cucurbitae based on the parameters studied. The efficacy of abamectin was significantly better in comparison with that of the others. Therefore, the abamectin can be suggested for effective management of the B. cucurbitae.