DEVELOPMENT OF EFFECTIVE INTEGRATED MANAGEMENT PACKAGE OF SWEET POTATO WEEVIL

Abstract

The present study on integrated management package of sweet potato weevil infesting sweet potato was conducted during rabi season (Nov-2017 to Mar-2018) in the experimental field of Department of Entomology at Sher-e-Bangla Agricultural University, Dhaka. The variety of sweet potato BARI Mistialu-8 was used as test crop. The experiment consisted of six treatments and one untreated control, they are T 1 : Sex pheromone trap + Earthing up one time + Mulching (straw) + One irrigation, T 2 : Sex pheromone trap + Earthing up two times + Two light irrigation , T 3 : Sex pheromone trap + Earthing up three times + Three light irrigation, T 4 : Earthing up two times + Sevin 85WP @ 3g\L of water at 15 days interval (2 times application), T 5 : Earthing up two times + Diazinon 10G @ 15 kg\ha (one time soil application), T 6 : Earthing up two time + Fenthion 2ml\L of water, T 7 : Untreated control. The experiment was laid out in Randomized Complete Block Design (RCBD) with three (3) replications. The result revealed that sex pheromone trap with earthing up three times and three light irrigation (T 3 ) showed the best control measure against sweet potato weevil compared to other treatments. Highest number of sweet potato weevil adult was found in T 7 (9.46 weevil/plot) and highest damage result was observed in T 7 (15.4%). Whereas the lowest number of adult weevil was observed in T 3 (0.392 weevil/plot) and lowest damage was noticed in T 3 (5.04%). At 15 days early harvest, in consideration of infestation level of storage tubers in number and weight basis, the lowest infestation was recorded from T 3

(3.68% and 5.68%), whereas the highest infestation (12.24% and 12.98%) was observed in T 7 . At optimum days harvest, for infestation level of tubers in number and weight basis, the lowest infestation was recorded from T 3 (4.49% and 6.48%), whereas the highest infestation (13.55% and 14.15%) was observed from T 7 treatment. After 15 days from optimum harvest, in case of infestation level of tubers in number and weight basis, the lowest infestation was recorded from T 3 (5.32% and 6.92%), whereas the highest infestation (16.35% and 17.04%) was observed from T 7 treatment. Besides, highest deformed tuber was found in T 7 (11.960%) and lowest in T 3 (2.362%). The highest yield was recorded from T 3 (41.87 t/ha), whereas, the lowest from T 7 (30.28 t/ha) treatment. These findings illustrated that, the Sex pheromone trap with earthing up three times and three light irrigation (T 3 ) treatment was more effective for controlling of sweet potato weevil.