Effect of Botanicals on Oviposition Action against Uji Fly (Exorista bombycis Louis.) and their Hatchability on Silkworm

The ovipositional deterrent and ovicidal activities of uji fly by spraying with different plant products on oviposition against uji fly (E. bombycis L.) on silkworm was studied by spraying varied concentrations, viz., 1.00, 2.00 and 3.00 per cent on second day of fifth instar larvae on which eggs were laid. Significant differences were noticed among the plant products and it was lowest number of eggs laid by spraying with pongamia oil at 3 per cent concentration (2.00) followed by Mahua oil (8.00), Clerodendron innerme (11.00) and highest (17.66) with Vitex negundo as against the control (84.33). Similar trend was recorded, percentage of eggs laid over the total eggs laid was also lowest at 3 per cent (2.32) on Pongamia oil and it was highest (17.31) with Vitex negundo. As the concentration increased, the number of eggs laid decreased in all the plant products. The rate of eggs hatchability was nil at 3 per cent concentration on Pongamia oil as against the control (86.02%). The egg hatchability reduction over control was maximum (33.47%) at 3 per cent on Vitex negundo and it was nil at 3.00 per cent on Pongamia oil. Hence, the use of plant products could be an eco-friendly and low cost method for managing uji fly.