Estimation of crop losses due to grey mildew (Ramularia areola Atk.) disease in Bt cotton hybrid

摘要

A field trial was conducted at Regional Agricultural Research Station, Guntur during three kharif seasons to estimate the losses due to grey mildew in cotton hybrid Bunny Bt Carbendazim (0.1%) was sprayed at 15 days interval starting from 35 to 95 days after sowing. Lowest mean per cent disease intensity (PDI) of 11.41 was recorded with Carbendazim (0.1%) sprays at 35, 50, 65, 80 and 95 days after sowing. Pooled data showed reduction of disease in all treatments. Yield data from different treatmentsshowed that protection by spraying Carbendazim (0.1%) from 50 days after sowing at 15 days interval up to 95 days resulted in avoidable losses to the tune of 38.38 per cent with or benefit cost ratio of 3.25.