Efficacy of some botanical extracts for eco-friendly management of aphid in yard long bean

Abstract

The study was conducted to find out less hazardous, environmental friendly and locally available botanicals to control bean aphid. Seven plant extracts viz., neem leaves (Azadirachta indica), lemon outer shell (Citrus aurantifolia), wild sunflower (Helianthus petiolaris), water gourd (Lageneria siceraria), green mango (Mangifera indica), bitter gourd (Momordica charanter), fire tree (Delonix regia) and detergent (5 g trix/L) were prepared to control the aphid infestation in yard long bean (variety kagarnatki) in the field. About 100 g of fresh plant parts of each were boiled in one liter of water at 550C for 5 minutes. Then rest the sample for one hour. The solutions were filtered and kept in clean glass bottles. The extract was kept in refrigerator at 40C until use. Then the extracts were sprayed at an interval of 3 days in the experimental field of yard long bean. The damage potential of aphid was counted at every 3 days in a week. Results of this study showed that plant extracts were effective against aphid infestation in yard long bean. Similarly, yield results corresponded positively with the effectiveness of the treatments. In this study, fire tree &water gourd treatment showed 95-98% control of yard long bean aphid, whereas a high number of aphids were found in the bitter gourd treatment (21.27±5.985278). Fire tree and water gourd treatment kept about 21.27 times better performance than that of bitter gourd treatment. Water gourd and fire tree has antibacterial, antifungal, antimicrobial properties and toxic activity to control insect pests. So, the present finding suggests that the use of plant extracts of fire tree and water gourd treatment to be very effective botanicals to control aphids of yard long bean in Bangladesh.

Asian Australas. J. Food Saf. Secur. 2020, 4 (1), 8-13