Bioefficacy Of Herbals For The Management Of Brinjal Hadda Beetle, Henosepilachna Vigintioctopunctata Fabr. (Coleoptera: Coccinellidae)

Abstract

Henosepilachna vigintioctopunctata is a polyphagous pest feeding on many solanaceous and cucurbitaceous crops especially egg plant (Solanum melongena). A significant damage caused by this pest due to varacious feeding nature on the foliage of eggplants has been reported with reduction in crop yield. Thus, it is essential to control this devastating pest of economic importance. The present study has been conducted using petroleum ether extracts of Eucalyptus globulus (Safeda), Ipomoea fistulosa (Besharam) and Prunus persica (Aru) prepared by Soxhlet extraction process and were tested against first instar larvae. It was found that 1.0 percent concentration of all the three extracts killed 73.33-93.3% larvae. All the extracts at 0.5% exhibited significant larval mortality of 60.0, 53.33 and 40.0%, respectively. The highest concentration i.e. 1% of all the extracts showed the reduction in total developmental period (16.17-19.34 days) in comparison to control (20.I7days). The adult emergence with 1% extracts of E. globulus and I. fistulosa was recorded 6.67% whereas P. persica extract showed 26.67% adult emergence. The extracts used at 0.5% were exhibited the adult emergence from 40 to 60%. The present study revealed I. fistulosa as the most effective extract against the first instar larvae of H. vigintioctopunctata. The LC₅₀ values of the plant extracts had also been determined