Population dynamics and comparative efficacy of neem products, bioagents and insecticides against leafhopper of okra Abelmoschus esculentus L. Moench

Abstract

The present investigation entitled “Population dynamics and comparative efficacy of neem products, bioagents and insecticides against Leafhopper of okra Abelmoschus esculentus (L.) Moench, cultivar i.e. VNR-22 (Komal) was conducted during July, to November, 2016 at Central Field of agriculture, SHUATS, Allahabad. The occurence of leafhopper (Amrasca biguttula biguttula), commenced from 34th standard week (August fourth week) with an average population of 1.45(leafhoppers/3leaves) and then the population gradually increased and reached to its peak level by 41st standard week (October second week) with an average population of 13.77(leafhoppers/3leaves) respectively. There after declined trend was observed as temperature decreased. It was found that population of leafhopper increased with increasing maximum temperature and positively correlated with maximum temperature. Seven treatments i.e., Neemoil@2%, [email protected]/L, Verticillium lecanii @2g/L, Metarhizium anisopliae @2g/L, Beauveria bassiana @2.5g/L, NSKE@5%, and [email protected]/L were evaluated against leafhopper (Amrasca biguttula biguttula.). Minimum population of hopper infestation was observed in Thiamethoxam with (1.903Leafhoppers/3leaves) followed by Acetamiprid (1.955Leafhoppers/3leaves)˂ Neem oil (5.023 Leafhoppers/3leaves)˂ Beauveria bassiana(5.685 Leafhoppers/3leaves)˂ Verticillium lecanii (6.178 Leafhoppers/3leaves)˂ NSKE (6.395 Leafhoppers/3leaves)˂ Metarhizium anisopliae (6.676 Leafhoppers/3leaves)˂untreated control (water spray) (9.906 Leafhoppers/3leaves) respectively.