Implications Of Diflubenzuron On The Grubs Of Hadda Beetle, Henosepilachna Vlgintioctopunctata (Coleoptera: Coccinellidae) Infesting Eggplant

Abstract

The present study was conducted to evaluate the implications of diflubenzuron, a chitin synthesis inhibitor, against grubs of Henosepilachna vigintioctopunctata following two treatment methods i.e. feeding and contact. Following feeding method, the larval mortality of 22.49±1.3 to 100% while contact treatment showed 16.67±6.7 to 100% against first and third instar grubs was recorded in different concentrations. Adult emergence was completely inhibited in 1000 ppm tested against first instars by both the treatment methods. The developmental period increased up to 22.49±1.3 days in feeding method to first instar grubs in 100 ppm as compared to control. Diflubenzuron treatment showed morphological deformity in newly emerged adults like malformed wings, elytra and legs. Comparing the LC50 values of the compound, feeding method was found to be superior to contact showing better efficacy against the grubs of hadda beetle