EFFICACY OF DIFFERENT PLANT EXTRACT FOR THE MANAGEMENT OF APHID AND POD BORER OF COUNTRY BEAN

Abstract

The experiment was conducted at the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the efficacy of different plant extracts for the management of aphid and pod borer of country bean (BARI seem-5) during the period from November, 2018 to March, 2019. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Seven treatments, viz. T =Neem leaves extract @ 5ml/L of water at 10 days interval; T 2 1 = Onion bulb extract @ 5ml/L of water at 10 days interval; T =. Datura seeds extract @ 5ml/L of water at 10 days interval; T = Black pepper seed extract @ 5ml/L of water at 10 days interval; T xii 5 4 = Garlic bulb extract @ 5ml/L of water at 10 days interval; T = Mahogany seed extract @ 5ml/L of water at 10 days interval; T 7 6 = Untreated Control were used. In consideration of total growing period by number the % pod infestation, the lowest infested pods plant -1 by number was observed from T 1 (21.02%), where the highest pod infestation was found from T

(60.13%), % pod infestation in weight, the lowest infested pods plant was observed from T 1 (16.79 %), whereas the highest in T (56.10%). The highest number of inflorescence plant -1 was observed from T 1 7 (33.08) while the lowest number was observed from T 1 (26.00) treatment. The highest yield hectare -1 -1 was found from T

(4.28 ton), while the lowest yield hectare -1 was found from T (2.94 ton) treatments. The pod yield of country bean was highly significant (p=0.05), very strong (r 7 =0.949) and negatively correlated with pod infestation by number i.e., the yield was decreased with the increase of pod infestation by number. Considering the controlling of country bean insect pests with some control options where, the highest benefit cost ratio (3.03) was recorded in the treatment T and the lowest benefit cost ratio was recorded from T 7 1 (2.50).The pod yield of country bean was highly significant (p=0.05), strong (r 2 =0.935, r 2 =0.913, r 2 =0.949, r 2 =971) and positively correlated with number of pods inflorescence -1 , pod length, number of inflorescence plant , number of flower inflorescence -1 i.e., the yield was increased with the increase of pods inflorescence -1 , pod length, no. of inflorescence plant -1 -1 2 , no. of flower inflorescence . From the study, it may be concluded that treatment T which comprised with the spraying of neem leaves extract @ 5ml/L of water at 10 days interval was more efficacy of different plant extract for the management of aphid and pod borer of country bean which was followed by spraying of T 5 1 = Garlic bulb extract @ 5ml/L of water at 10 days interval.