International Journal of Entomology Research

Authors
Toma Chakraborty, Naznin Nahar, Gopal Das

Abstract
In the present study, experiments were conducted in the laboratory to evaluate the potentiality of some promising insect growth regulators (IGRs) viz. Buprofezin (Award 40 SC), Lufenuron (Heron 5 EC) and Pyriproxyfen (Pyrifen 10.8 EC) on the weight reduction of bean aphid, Aphis craccivora (Koch). Each of the IGRs was tested in three different concentrations (0.5, 1.0 and 1.5 ml/L) following three application methods namely direct (topical), indirect (leaf-dip) and combined (topical+ leaf-dip). Weight changes data were recorded at 3 and 7 days after treatment (DAT). All the selected IGRs were found effective against bean aphid in the laboratory condition. Weight change of bean aphid was clearly dose, time and method dependent. Significant level of weight reduction was observed at 3DAT from all application methods but maximum weight reduction was found at 7 DAT. Highest weight reduction was recorded from the concentration 1.5 ml/L which was followed by 1.0 ml/L and 0.50 ml/L respectively. It was also observed that combined application method was found highly effective than topical and leaf-dip method regarding weight reduction.