Mortality and growth inhibition of brinjal shoot and fruit borer, Leucinodes orbonalis (Guen.) by buprofezin, a potent chitin synthesis inhibitor
Gopal Das and Tarikul Islam
In the present laboratory study, different concentrations of award 40 SC (Buprofezin) have been applied (topical, potato-dip and topical + potato-dip method) on the 2nd instars larvae of brinjal shoot and fruit borer (Leucinodes orbonalis Guen.) and then mortality, weight reduction or cuticular change was observed at 3 HAT (hours after treatment), 3 and 7 DAT (days after treatment) application. No mortality or weight reduction was observed at 3 HAT. The significant level of mortality and weight reduction was observed at 3DAT from all applying methods but the maximum mortality and weight reduction was found at 7 DAT. It was also observed that potato-dip method was highly effective than topical method regarding mortality and weight reduction while almost similar efficacy was found from potato-dip and combination (topical + potato-dip) methods. Cuticular abnormalities were found when larvae were treated with higher concentrations of buprofezin in comparison with that in the water-treated control. Moreover, larval mortality and weight reduction were clearly dose-dependent. The lower dose (200 ppm) was ineffective for topical application method but was effective in case of potato-dip and combination methods. Therefore, it is concluded that buprofezin is a potent IGR (insect growth regulator) molecule to reduce L. orbonalis populations through inhibition of chitin biosynthesis.
Gopal Das, Tarikul Islam. Mortality and growth inhibition of brinjal shoot and fruit borer, Leucinodes orbonalis (Guen.) by buprofezin, a potent chitin synthesis inhibitor. J Entomol Zool Stud 2014;2(6):282-287.