Vol. 11, Special Issue 10 (2022)

Author(s):
Sachin Kumbar, Dr. LK Rath and Manjunath Badiger

Abstract:
Bio-efficacy of chitin synthetic inhibitors on cabbage leaf webber, Crocidolomia binotalis (Zell) were evaluated by using leaf dip bioassay method under laboratory condition during 2018-19. The study revealed that diflubenzuron 25 WP at 0.011 percent, novaluron 10 EC at 0.021 percent and buprofezin 25 SC at 0.019 percent concentrations (LC₅₀) caused 50 percent mortality on 3^rd instar larvae. In treatment, larvae showed morphogenic deformities such as larval-pupal intermediates, deformed larvae etc. and the results of experiment done on one day old pupae, revealed that diflubenzuron 25 WP at 0.015 percent, novaluron 10 EC at 0.018 percent and buprofezin 25 SC at 0.017 percent concentrations (LC₅₀) caused 50 percent pupal mortality and reduction in pupal size. Emerged adults from the treated pupae were with morphological deformities like crippled and wrinkled wings, reduced antennae and reduction in size.