INCIDENCE OF INSECT PESTS COMPLEX OF BARI MOTOR -1 (PISUM SATIVUM) AND THEIR MANAGEMENT

Abstract

The experiment was conducted in the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka-1207 during the period from November, 2014- March, 2015 to incidence of insect pest complex of BARI motor -1 and their management and their impact on natural enemies. The experiment was laid out in a Randomized Complete Block Design with three replications and five treatments applied at 7 days interval. The treatments were T1: Mechanical and Cultural practices at 7 days interval, T2: Mechanical control and spraying Ripcord 10EC @ 1.0 ml//L of water at 7 days interval, T3: Spraying Suntaf 50SP @ 1.5 g/L of water at 7 days interval, T4: Spraying Topgan 10EC @ 1.0 ml/L of water at 7 days interval and T5: Untreated control. The result reveled that among different treatments Mechanical control and spraying of Ripcord 10EC @ 1.0 ml//L of water at 7 days interval was most effective in reducing the incidence of insect pests of BARI motor-1 and leaves infestation by white fly, aphid, and epilachna beetle (5.73 , 4.76 and 5.39%respectively) and in reducing pod infestation by number at early, mid and and late pod development stage caused by pod borer the lowest infestation (3.06, 4.23 and 5.00 % respectively) whereas the highest infestation (11.97, 13.75 and 14.81% respectively) was observed in T5. As the best treatment, it reduced the highest level of pod infestation conversely it increased the maximum level of plant and pod related yield attributes, that is T2 increased the maximum height (cm), number of pods/plant, number of seeds/pod, and weight of 100-seeds (g) (50.94, 50.47, 5.27 and 17.15 respectively) of pea over control followed by Spraying Suntaf 50SP @ 1.5 g/L of water (49.04, 47.53, 5.07 and 16.63 respectively) and Topgan 10EC @ 1.0 ml/L of water (49.67, 48.47,5.13and 16.22 respectively). T2 also had the highest pod yield (2.09 t/ha) followed by T1, T3, and T4 (2.00, 2.02.and 1.987 t/ha).Considering the impact of management practices on the population of natural enemy, T2 had adversely affected and reduced the highest population of adult ladybird beetle and field ant (83.10% and 80.00% respectively) over control followed by T3 (73.70% and 78.60%) Though, T2 reduced the highest level of insect pests infestation of BARI motor-1 and including other chemical treatments, conversely they mostly harmful to the beneficial arthropod biodiversity in the pea ecosystem by reducing the maximum level of the natural enemy population than any other newer insecticides which were comparatively safe, and would be fit well into the management of insect pests of BARI motor-1.