MAJOR INSECT PESTS OF YARD LONG BEAN (Vigna sesquipedalis) AND THEIR MANAGEMENT WITH SOME PROMISING INSECTICIDES

Abstract

An experiment was conducted in the farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla nagor, Dhaka, Bangladesh during March to June 2014to study the major insect pests of yard long bean (Vignasesquipedalis) and their management. The seeds of Kegornatki were used as the test crop for the experiment. The experiment consisted of seven treatments viz. T1(Emamectin benzoate (wonder 5G) @ 1g/L of water), T2(Volium flexi 30EC @ 0.5 ml/L of water), T3(Lamdacyhalothrin 2.5EC @ 1 ml/L of water), T4(Imidachloprid @ 0.5 ml/L of water), T5(Abamectin 1.8 EC @ 1.2 ml/L of water), T6(Neem oil @ 5 ml/L + Trix) and T7(Untreated control). The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Data on the number of pests per plant, number and weight of healthy and infested pod and percentage of pod infestation in number and weight, yield contributing characters and yield of yard long bean were recorded and statistically analyzed. Significant variation was found among the different treatments regarding different parameters of the crop. Incidence of major insect pests of yard long bean was recorded for the entire cropping season and aphid, jassid, pod borer and epilachna beetle were observed. At early, mid and late pod stage, the lowest % pod infestation (in number) (10.60 %, 5.27 % and 10.03 % respectively) was observed from Voliam flexi 300SC, while the highest infestation (36.87%, 31.01% and 38.99% respectively) was recorded in Untreated control. Similar results were found for pod infestation in weight basis. The highest yield per hectare was recorded from Voliam flexi 300SCwhile the lowest yield was recorded from Untreated control.