Effect of novel insecticide molecules in mulberry on reeling parameters of silkworm Bombyx mori L. cocoons

Abstract

Effect of novel insecticides treated mulberry leaves on the reeling performance of silkworm Bombyx mori L were studied. The cocoon filament length was longest in untreated control and in the insecticide treatments viz., dinotefuron 20 SG @ 0.25 g/l, dichlorvos 76 EC @ 2.63 ml/l at different time intervals of 10, 20, 30 Days After Spraying. Lowest filament length was recorded when flonicamid 50WG sprayed @ 0.3 g/l and 20, 30 and 40 DAS. This was followed by azadirachtin 1 % @ 1 ml/l recording shorter filament length at 40 DAS. However, at 10 and 20 DAS azadirachtin 1 % @ 1 ml/l recorded longest cocoon filament which were on par with untreated control. At 10 DAS, filament denier across all the treatments was on par with each other except in the treatments dinotefuron 20 SG @ 0.12 g/l and dichlorvos 76 EC @ 2.63 ml/l. At 40 DAS, finer denier was observed in the treatments pymetrozine 50 WG @ 0.6 g/l & 0.3 g/l, flonicamid 50 WG @ 0.3 g/l & 0.15 g/l, dinotefuron 20 SG @ 0.12 g/l. In the remaining treatments, the filament denier was on par with untreated control. Azadirachtin 1 % @ 2 ml/l recorded finer denier at 30 and 40 DAS. Buprofezin 25 SC @ 1ml/l recorded coarse denier on par with control at 10, 20, 30 DAS, whereas denier was finer with the same treatment at 40 DAS. Among the various treatments, dinotefuron 20 SG @ 0.25 g/l has performed well with reference to the reeling parameters.