EFFECTIVENESS OF SOME BIOPESTICIDES AND CHEMICAL PESTICIDES TO MANAGE LEGUME POD BORER (Maruca vitrata) ON YARD LONG BEAN

Abstract

The study was conducted in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from April to August, 2017 to evaluate the effectiveness of some biopesticides and chemical pesticides to manage legume pod borer (Maruca vitrata) on yard long bean. The seeds of BARI yard long bean-1 were used as the test crop in this experiment. The experiment comprised of the following bio-pesticides and chemical pesticides as treatment- T0: Untreated control; T1: Neem oil @ 4 ml/L of water at 7 days interval; T2: Neem seed kernel @ 30 g/L of water at 7 days interval; T3: Oshtad 10 EC @ 1 ml/L of water at 7 days interval; T4: Voliam Flexi 300 SC @ 0.5 ml/L of water at 7 days interval; T5: Bishkatali leaf extract 4 ml/L of water at 7 days interval and T6: Spinosad 45 SC 1 ml/L of water at 7 days interval. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Recorded data showed statistically significant variation for different treatments. At early pod development stage, the lowest infested pods per plant in number and weight basis was observed from T1 (1.26% and 5.33%)) treatment, again the highest infested pods (14.32% and 17.46%) was recorded in T0 treatment. At mid pod development stage, the lowest infested pods per plant in number and weight basis was observed from T1 (2.42% and 5.76%) treatment, whereas the highest infested pods (16.68%and 18.12%) was recorded in T0. At late pod development stage, the lowest infested pods per plant in number and weight basis was observed from T1 (3.03% and 6.50%) treatment again the highest infested pods (17.84% and 19.87%) was recorded in T0 treatment. The highest yield was recorded from T1 (21.76 t/ha), whereas the lowest yield from T0 (14.15 t/ha) treatment. The highest benefit cost ratio (2.51) was estimated for T1 treatment and the lowest (1.26) for T4 treatment. Among the different control measures, spraying of Neem oil @ 4 ml/L of water at 7 days interval was the better for the controlling pod borer of yard long bean.