SURVEY THE MAJOR INSECT PESTS AND THEIR MANAGEMENT IN DIFFERENT NURSERIES OF GREATER DHAKA CITY

Abstract

Thirty nursery of greater Dhaka district were selected for conducting the study. As a part of survey, owners of selected nursery were interviewed and prepared a clear observation through a questionnaire during the period from November 2013 to May 2014. Objective-oriented structured questionnaires were used to identify socio-economic status of the nursery owners, intensity of infestation in different seedlings, major insect pests in nursery and their proportion for specific seedlings, species wise management practices and use of different insecticides for managing these insect pests for specific seedlings or saplings species. Among the nurseries the highest around 50.00% have low level infestation of nursery seedlings or saplings followed by 26.67% nursery in mid infestation level and 3.33% nursery high and sever level infestation of seedlings and saplings. Different insects was recorded from infested seedlings/saplings and the species are thrips, hairy caterpillar, aphid, stem borer, jassid, white fly, green bug, leaf minor and stem fly was recorded. Nursery owners used different insecticides mainly Ripcord, Mancozeb, Dithane, Sevin, Bavistin, Simcaf, Cartap Endofil and used for controlling different insects. The nursery owner’s practices (NPs) the highest seedling infestation was recorded from NP1 (40.00%), whereas the lowest sapling infestation was observed from NP5 (6.67%) followed by NP4 (10.00%). The highest BCR was calculated from NP5 (3.56), while the lowest BCR was observed from NP1 (2.90). The pesticides combination (ICs) the highest seedling infestation was recorded for IC1 (43.33%), whereas the lowest seedling infestation was recorded from IC6 (3.33%) and IC5 (6.67%) for the management of nursery pests. The highest BCR was recorded for IC6 (3.01), while the lowest BCR was recorded from IC1 (2.41) and then IC2 (2.43) for the management of nursery pests. Among the nursery owner’s practices NP5 (Mechanical, Cultural, Field sanitation) was suitable in terms of insect control and also benefit cost ratio. Among the pesticides combination (ICs) the IC6 (Mancozeb + Simcaf + Endofil) was suitable in terms of insect control and also benefit cost ratio.