Abstract
Melon fruit fly, Bactrocera cucurbitae (Coquillett) is an important pest of cucurbits and other vegetable crops. It is not only a serious pest of cucurbit crops but sometimes also attacks non-host plants. In an endeavour to explore secondary metabolites as important and safe means of pest management, we investigated the effects of gallic acid, a phenolic compound, on the growth and development of melon fruit fly, B. cucurbitae. Larval survival and emergence were severely affected by gallic acid treatment. Both decreased in a concentration dependent manner with increase in concentration. Gallic acid-treated larvae took longer duration to pupate and reach the adult stage as compared to control larvae. Inhibitory effects of gallic acid were also observed on larval weight, pupal weight, mean relative growth rate and food assimilated which decreased with treatment. The ability of gallic acid to disrupt the development of B. cucurbitae suggests that the phenolic compound might have caused oxidative stress in the body of the insect.
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