RAMAKRISHNA NAIKASUNIL KUMAR, T.2020-10-062020-10-062019-08-23Th-12402https://krishikosh.egranth.ac.in/handle/1/5810152479The experiment was carried out in the Department of Sericulture, University of Agricultural Science, GKVK, and Bengaluru during 2016-2019. The survey on leaf roller indicated that, the incidence was peak during September 2018 (38.15 %) at Ramanagara and October 2017 (40.12 %) at Chintamani. The correlation studies revealed that, there was significantly negative influence of maximum temperature and significantly positive influence of relative humidity, rain fall and biotic factors on the abundance of leaf roller. The insecticide emamectin benzoate caused maximum pest reduction (83.00 %) after 9 days of spray under field condition, followed by chlorofenapyr (82.51 %), fipronil (82.34 %), azadirachtin (81.66 %), lambda-cyhalothrin (79.57 %), novaluron (78.46 %) and profenofos (77.37 %). The bioassay studies indicated that, lambda-cyhalothrin and emamectin benzoate highly toxic even after 30 days after spray (DAS). However, the rearing parameters recorded with chlorofenapyr @ 10 DAS, azadirachtin and novaluron at 25 DAS, profenofos and fipronil at 30 DAS which were on par with dichlorvos and untreated control. The findings of present study clearly indicated that the insecticide chlorofenapyr was safe to silkworms even at 10 DAS followed by azadirachtin and novaluron at 25 days after spraying and profenofos and fipronil at 30 days after spraying.EnglishThesis