Efficacy of certain bio-pesticides against sucking pests of okra, Abelmoschus esculentus (L.) Moench

Abstract

A field experiment was carried out at the Assam Agricultural University, Jorhat, Assam, India during 2018-2019 to evaluate the efficacy of different biopesticides against sucking pests of okra. The treatments viz. neem oil @ 5%, karanj oil @ 5%, Melia azedarach leaf extract @ 5%, garlic extract @ 5%, chilli fruit extract @ 5%, Beauveria bassiana @ 5ml/l, Verticillium lecanii @ 5ml/l, deltamethrin @ 10 g a.i./ha were applied at 15 days interval starting from seedling stage when leafhopper and aphid infestation started. Results revealed that the overall best performance of insecticides against leafhoppers recorded in deltamethrin treated plots with the lowest mean population of leafhoppers (2.07 leaf hoppers/3 leaves) followed by neem oil (2.54 leaf hoppers/3 leaves), karanj oil (3.20 leaf hoppers/3 leaves) while the order of efficacy against aphids was deltamethrin (3.25 aphids/3 leaves), neem oil (5.87 aphids/3 leaves), karanj oil (6.82 aphids/3 leaves). Results revealed that deltamethrin, neem oil and karanj oil were very effective treatments against leafhoppers and aphids.