Survey on Grasserie Disease of Silkworm and its Cost-effective Management

摘要

The survey on grasserie incidence showed that Coimbatore, Erode and Tirupur districts in Tamil Nadu were affected by grasserie disease. Grasserie incidence ranged from 31.58 to 4.04 per cent with maximum cocoon yield loss at Dharapuram TSC (30.05 kg/100 dfls). Application of TNAU seri dust followed by Psoralea extract per os drastically reduced the larval mortality from 3.28 to 1.35 per cent. Maximum larval weight, cocoon weight, shell weight, shell ratio and cocoon yield were registered in TNAU seridust + Psoralea extract treated batch. Subsequent On-Farm Trials confirmed the reduction in larval mortality and enhancement in economic and yield parameters of silkworm, Bombyx mori L. Higher incremental cost benefit (ICB) of 2.37 was recorded in the batch treated with TNAU seri dust and Psoralea.