MANAGEMENT OF BEAN POD BORER USING SOME BOTANICALS, PHEROMONE TRAPS AND CHEMICAL INSECTICIDES

Abstract

A field experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University to find out the effective as well as hazards free management practice(s) of bean pod borer infesting country bean, cultivated during Rabi season (October, 2016 to February, 2017). The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The experimental treatments were T1 comprised of spraying of neem oil @ 3ml/L of water at 7 days interval; T2 comprised of spraying of neem seed kernel extract @ 0.5ml/L water at 7 days interval; T3 comprised of setting up of 1 lure with pheromone trap per plot; T4 comprised of spraying of Fytomax 0.03 EC @ 0.4 ml/L of water at 7 days interval; T5 comprised of spraying of Actara 25 WG @ 0.3 g/L of water at 7 days interval; T6 comprised of spraying of Cot 10 EC @ 0.4 ml/L of water at 7 days interval; T7 comprised of T1 and T3; T8 comprised of T2 and T3 and T9 comprised of untreated control. Fytomax 0.03 EC (T4) contributed to produce the highest number of inflorescence, flower bud and fruit by number at early stage (74.73 inflorescence/plot; 64.51 flower bud/five tagged inflorescence and 29.75 fruit/ five tagged inflorescence respectively), mid stage (80.50 inflorescence/plot; 69.93 flower bud/ five tagged inflorescence and 35.83 fruit/ five tagged inflorescence respectively) and late stage (78.16 inflorescence/plot; 66.22 flower bud/ five tagged inflorescence and 31.51 fruit/ five tagged inflorescence respectively); total weight of fruit (159190 gm/plot) and reduced the maximum inflorescence infestation, flower bud infestation and fruit infestation over control at early stage (81.44%, 87.21% and 89.66% respectively), mid stage (80.85%, 83.51% & 80.07% respectively) and late stage (82.05%, 87.21% & 90.27% respectively). The highest yield (23.59 ton/ha) was recorded in T4 which contributed to increase the highest yield (89.63%) over control. The highest benefit cost ratio (53.13) was also found for T4 and the lowest BCR (7.49) for T5. The highest number of lady bird beetle (5.40 lady bird beetle/five vines/plot/inspection), black ant (6.27 black ant/five vines/plot/inspection), spider (5.33 spider/five vines/plot/inspection), syrphid fly (5.17 syrphid fly/five vines/plot/inspection) and honeybee (4.37 honeybee/five vines/plot/inspection respectively) was recorded in T4, where the lowest number of lady bird beetle (1.33 lady bird beetle/five vines/plot/inspection), black ant (1.17 black ant/five vines/plot/inspection), spider (1.13 spider/five vines/plot/inspection), syrphid fly (1.87 syrphid fly/five vines/plot/inspection) and honeybee (1.07 honeybee/five vines/plot/inspection respectively) was recorded in T6. Considering the social acceptance and environmental safety point of view, T4 comprising Fytomax 0.03 EC was the most effective management practices by reducing the bean pod borer infestation and increasing the population of beneficial arthropods, thereby increasing the yield of country bean.