Studies on mango leaf webber, Orthaga spp. with special reference to seasonal evaluate newer insecticides along with biopesticides against mango leaf webber, Orthaga spp.
Author(s): Archana Kerketta, Dr. Sanjay Sharma, Dr. RKS Tomarn and Dr. BP Katlam
Abstract: “Studies on mango leaf webber, Orthaga spp. with special reference to seasonal incidence, biology and management” was conducted during the year 2015-16 and 2016-17at the Horticultural orchard of BTC College of Agriculture and Research Station, Bilaspur (C.G). Data on seasonal incidence indicated that minimum larval population of 21.24 larvae/tree was recorded on Himsagar followed by Kurkan, Kesar, Karela, Sunderja, Dilpasand, Dashari, Langra and Alphanzo with 21.83, 23.21, 24.02, 29.43, 30.28, 31.08, 32.19 and 33.16 larvae/tree, respectively. The minimum webbing 12.50 webs/tree was recorded on Himsagar followed by Kurkan, Kesar, Karela, Sunderja, Dilpasand, Dashari, Langra and Alphanzo with 16.38, 17.39, 17.89, 18.13, 19.52, 19.84, 20.10 and 21.80 webs/tree, respectively. Biological study of leaf webber, Orthaga exvinacea Hampson revealed that female moths lay greenish dull, oval, flattened eggs singly or in groups on the lower surface of leaves near the midrib or vein. The width and length of the eggs were 0.97 and 0.67 mm, respectively.Newer insecticides along with biopesticide and mechanical method were evaluated against mango leaf webber (Orthaga spp) and minimum larval population (12.53 larvae/ tree) was recorded under mechanically destruction of webs. The second best effective treatment was application of Clorantranilliprole 18.5% SC (21.21 larvae/tree) followed by Flubendiamide 39.5% SC (21.65 larvae/tree) and Indoxacarb 14.5% SC (23.08 larvae/tree) . Application of Bacillus thuringiensis 5% WP had resulted the highest larval population of 31.00 larvae/tree found as least effective in reducing the leaf webber population.
