BIO-RATIONAL MANAGEMENT PRACTICES INCLUDING BIO-CONTROL AGENTS AGAINST BRINJAL SHOOT AND FRUIT BORER, LEUCINODES ORBONALIS

Abstract

The present experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to find out the efficacy of bio-rational management practices including bio-control agents against Brinjal Shoot and Fruit Borer (BSFB) during October, 2018 to March, 2019. This experiment tested on a Hybrid brinjal variety “Begun-706” laid out in RCBD with 3 replications. The experiment comprised eight treatments viz., T 1 = Cultural + mechanical control method, T 2 = Braconid wasps @ 20-25/plot + sanitation, T 3 = Sanitation + Funnel Pheromone trap, T 4 = Sanitation + Sevin 50 WP @ 1.0g/L of water, T 5 = Success 2.5 EC @ 0.5 ml/L of water + Pheromone trap, T 6 = Spinosad 45% SC @ 0.01% + Funnel Pheromone trap, T 7 = Sanitation + Trichogramma evanescens @ 1 card/plot (1000 eggs per card) and T 8 = Untreated control. The plots treated with T 5 treatment, resulted significantly lowest percentage of infested shoot, flower and fruit, which was statistically similar with T 6 treatment during the whole period and the highest infestation was found in T 8 treatment followed by T 1 treatment. The yield contributing characters found highest in T 5 treatment for length, girth and weight of individual fruit and was statistically similar to T 6 treatment. In case of yield, T 5 (56.65 t ha ) showed the best result which was statistically similar with T 6 (53.88 t ha -1 -1 ) followed by T 4

(28.45 t ha -1 ), T 7 (27.43 t ha -1 ), T 2 (25.10 t ha -1 ), T 3 (24.02 t ha -1 ) and the lowest result was found in T 8 (23.66 t ha -1 ) followed by T 1 (33.20 t ha -1 ). Percent increase over control was higher in T 5 (139.42%), statistically similar with T 6 (127.73%). Therefore, T 5 and T 6 exhibited more than two times higher yield than T 8 . From this study, it was concluded that T 5 (Success 2.5 EC @ 0.5 ml/L of water + Pheromone trap)

was the most viable bio-rational options for L. orbonalis management which was statistically similar with T 6 (Spinosad 45% SC @ 0.01% + Funnel Pheromone trap).