Jyoti Thakur, Kamlesh Bali, R.K. Gupta, R.S. Bandral, Meenakshi Gupta and Peeyush Sharma4
Abstract
Grasserie is a highly destructive disease affecting silkworms, leading to significant economic damage in the sericulture industry. It severely impacts silk production, causing substantial financial losses for those involved in silk farming. The present study was conducted at Sericulture Research Laboratory of Division of Sericulture, SKUAST- Jammu in the year 2022 and 2023 during spring and autumn season. The results revealed that aqueous extract of 2% V. negundo exhibited highest larval weight (34.10±0.08 and 25.89±0.40g) followed by 2% P. corylifolia (32.11±0.33 and 24.40±0.21%) and P. corylifolia +Lime (1:1) (28.96±0.10 and 22.09±0.20g) and least larval mortality (21.05±0.99 and 29.97±1.14%), (27.91±0.16 and 35.56±3.97%) and (31.79±0.32 and 40.45±2.11 per cent) when compared to control (T9) (BmNPV only) which exhibited least larval weight (13.65±0.30 and 8.43±0.27g) and highest larval mortality (70.14±1.27 and 82.38±0.90%) in spring and autumn season respectively. Similarily, aqueous extract of 2% V. negundo observed highest per cent disease reduction (70.00±0.98 and 63.61±1.32) followed by 2% P. corylifolia (60.27±0.49 and 56.78±5.16) and P. corylifolia + Lime (1:1) (54.62±1.18 and 50.87±2.67) per cent in the spring and autumn season respectively.