DAMAGE SEVERITY OF MAJOR INSECT PEST OF YARD LONG BEAN AND THEIR ECO-FRIEDLY MANAGEMENT

Abstract

The study was conducted in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from November, 2018 to march, 2019 to evaluate the effectiveness of some botanicals and to manage major insect pest on yard long bean. The seeds of Yard long bean variety BARI borboti-1 were used as the test crop in this experiment. The experiment comprised of the following botanicals as treatment- T 1 : Garlic bulb extract @ 5 ml per liter of water at an interval of 7 days; T : Neem leaf extract @ 5 ml per liter of water at 7 days interval; T : Datura seeds extract @ 5 ml per liter of water at 7 days interval; T 4 3 : Black pepper seed extract @ 5ml per liter of water at an interval of 7 days; T : Mahogany seed extract @ 5 ml per liter of water at an interval of 7 days; T 6 5 : Tobacco leaf extract @ 5 ml per liter of water at an interval of 7 days and T : Untreated control. 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 percentage of infested pods per selected plants in number and weight basis was observed from T 6 7 (7.63% and 3.69%)) treatment, again the highest percentage of infested pods (29.99% and 24.18%) was recorded in T treatment. At mid pod development stage, the lowest infested pods per selected plants in number and weight basis was observed from T 6 7 (4.19% and 7.63%) treatment, whereas the highest infested pods (17.44%and 21.56%) was recorded in T . At late pod development stage, the lowest infested pods per selected plants in number and weight basis was observed from T 7 (5.33% and 9.40%) treatment again the highest infested pods (16.14% and 21.58%) was recorded in T 6 treatment. The highest yield was recorded from T 6 (16.57 t/ha), whereas the lowest yield from T (11.60 t/ha) treatment. Botanical extracts had significant effects on yield of yard long beans. Tobacco extract treated plants produced the greatest number and biomass of yard-long beans; the treatment was followed by neem, garlic and mahogany. The latter two treatments did not show significant effect.