MAJOR INSECT PESTS OF YARD LONG BEAN (VIGNA SESQUIPEDALIS) AND THEIR MANAGEMENT

Abstract

The present study was conducted at the Sher-e-Bangla Agricultural University, Sher-e-Bangla nargar, Dhaka, Bangladesh during from April to August 2011 for major insect pests of yard long bean (Vigna sesquipedalis) and their management. The seeds of BARI yard long bean-1 were used as the test crop for the experiment. The experiment consisted of the following treatments: T1: Shobicorn 425EC @ 2 ml/L of water at 10 days interval; T2: Ripcord 10EC @ 1 ml/L of water at 10 days interval; T3: Actara 25WG @ 0.5 g/L of water at 10 days interval; T4: Diazinon 60EC @ 3 ml/L of water at 10 days interval; T5: Suntap 50WP @ 3 g/L of water at 10 days interval; T6: Quinalphos 25EC @ 3 ml/L of water at 10 days interval; T7: Neem seed kernel powder @10 g/L of water at 10 days interval and T8: 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 pod, infested pod and percentage of pod infestation in number and weight, yield contributing characters and yield of yard long bean were recorded and statistically significant differences were calculated for different treatments. Incidence of major insect pests of yard long bean was recorded for the entire cropping season and pod borer, aphid and epilachna beetle were observed. At early, mid and late pod stage, the lowest % pod infestation (in number) (1.77%, 2.78% and 3.30%) was observed from T5 treatment, while the highest infestation (8.93%, 12.28% and 17.12%) was recorded in T8 treatment. Similar results/trends were found for pod infestation in weight basis. The highest yield per hectare was recorded from T5 (26.87 ton), while the lowest yield was recorded from T8 (12.20 ton).