Bio-efficacy of ecofriendly products against cotton leafhopper, Amrasca devastans (Dist.)

Field trial was conducted to evaluate the bio-efficacy of Pochonia (Verticillium) lecanii (9 x 109 cfu / g) @ 2500 g / ha, Metarhizium anisopliae (9 x 109 cfu / g) @ 2500 g/ha, Beauveria bassiana (9 x 109 cfu / g) @ 2500 g / ha, Panchagavya @ 5%, cowdung – urine extract @ 10%, green chilli-garlic extract @ 10%, neem oil @ 5% and fipronil 5% SC @ 50 g a.i./ha(c) against, Amrasca devastans. Among different treatments fipronil 5% SC @ 50g a.i. / ha was effective in bringing down the population of leafhoppers up to 72.3% over control at 14 days after spraying. About 20% reduction of leafhopper population over control was observed with green-chilli garlic extract and neem oil. Per cent reduction in leafhopper population was less with bio-control agents viz., V. lecanii @ 2500 g / ha (11.0), M.anisopliae @ 2500 g / ha (12.3), B. bassiana @ 2500 g / ha @ 2500 g / ha (14.9). Other organic compounds like Panchagavya @ 5%, cow dung-urine extract @ 10% were ineffective in managing the leafhopper population on cotton.