Population Dynamics and Management of Bean Pod Borer (Maruca Vitrata Fabricius) on Yardlong Bean Cultivation in Chittagong Hill Tracts of Bangladesh

Abstract

The research activity was conducted in major intensive yard long bean growing areas, such as Chittagong hill tracts regions of Bangladesh to know the population dynamics and to develop sustainable & eco-friendly management techniques for controlling major insect pests of yard long bean during 2016 and 2017 cropping season in the farmers’ fields at three hill districts of Chittagong. The study was carried out following randomized complete block design (RCBD) having seven treatment combinations. Each treatment turned into replicated three (03) times. Results found that bean pod borer infestation on yardlong bean commenced from 2nd week of May while pod formation commenced after which gradually increased with the age of crop. During this period environmental temperature was gradually increased but rainfall was decreased. Among the treatments, T3 reduced the highest infestation of bean pod by 90.07% in Bandarban, 89.29% in Rangamati and 89.80% in Khagrachari over control, respectively. The highest pod yield (17.64 tha-1 in Bandarban, 15.14 tha-1 in Rangamati and 15.93 tha-1 in Khagrachari, respectively) throughout the season were achieved by the same treatment. So, spraying of voliam flexi 300SC @ 0.5 ml Liter-1 water at 10 days interval+hand collection & destruction of infested fruits and larvae+nappy trap (T3) is going to be the foremost effective treatment to control bean pod borer in the three hill districts of Chittagong, Bangladesh.