ANTI-OVIPOSITIONAL AND REPELLENT EFFECTS OF BOTANICAL EXTRACTS AGAINST CUCURBIT FRUIT FLY, BACTROCERA CUCURBITAE (COQUILLETT)

Abstract

The study was conducted to evaluate the efficacy of six different plant extracts for their anti-ovipositional and repellent effects against cucurbit fruit fly, Bactrocera cucurbitae (Coq.) in the research laboratory of the Department of Entomology, HSTU, Dinajpur, during July to December 2016. Anti-ovipositional and repellent effects of the plant extracts were evaluated with three different solvents (water, methanol and acetone). The results of the present study indicated that all the plant extracts had the repellent and antiovipositional effects against B. cucurbitae that inhibited progeny development. The order of toxicity of the plant extracts based on repellency and anti-oviposition were found as tobacco > neem > water pepper > castor > bullock‟s heart > eucalyptus. Among the tested extracts it was found that no progeny (larvae and pupae recovery, and adult emergence) were developed at 4.0% and 5.0% concentrations. The highest number of progeny develoment (22.22 in larvae, pupae and adult emergence) was found in untreated control treatment. However, progeny recovery, percent repellency and antioviposition were found acted as dose dependent manner where percent repellency and ovipositional deterrence was decreased with the decreased doses of plant extracts. The highest repellency (60.44%) and anti-oviposition (89.43%) were found in water pepper whereas the lowest in neem (41.88 and 68.64%, respectively) plant extracts. It is evident from the results that at all plant extracts treatment caused a remarkable decrease in adult settled, larvae and pupae recovery, and adult emergence as compared with control.