EVALUATION OF PLANT EXTRACTS FOR THE MANAGEMENT OF BRINJAL SHOOT AND FRUIT BORER

Abstract

An experiment was conducted at the research field of Sher-e-Bangla Agricultural University (SAU), Dhaka-1207 during the period from November 2011 to June 2012 to evaluate the performance of some plant extracts for the management of brinjal shoot and fruit borer, (Leucinodes orbonalis Guenee). Experiment comprised 8 treatments including a control viz., T1: Tamarind fruit extract @ 50 g L-1 water, T2: Morning glory leaf extract @ 50 g L-1 water, T3: Bullok’s heart leaf extract @ 50 g L-1 water, T4: Neem leaf extract @ 50 g L-1 water, T5: Tobacco leaf extract @ 50 g L-1 water, T6: Mahogony seed extract @ 50 g L-1 water, T7: Aktara 25 WG @ 0.5 g L-1 and T8: Control. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Neem leaf extract @ 50 g L-1 water (T4) produced the highest number of total shoots (16.00 plant-1), healthy shoots (15.67 plant-1), total fruits (25.33 plant-1), healthy fruits (23.00 plant-1), total fruits weight (2.711 kg plant-1), healthy fruit weight (2.645 kg plant-1) and fruits yield (36.15 t ha-1). Lower number of infested shoot and fruits (0.33 and 2.33 plant-1, respectively) and percentage (2.223 and 9.303%, respectively) were also found in neem leaf extract @ 50 g L-1 water (T4), and infested fruits weight as well as its percentage was also lower (0.250 kg plant-1 and 9.303% respectively) in the same treatment. In contrast, per cent protection of shoot and fruit borer over control was higher (92.45 and 91.26%, respectively) and fruit yield increase over control was also higher (61.74%) in this treatment. Control treatment performed poorly in all parameters. These results concluded that the use of neem leaf extract @ 50 g L1 water would be highly effective to reduce the shoot and fruit infestation as well as to get higher yield of brinjal.