EFFECT OF SOME BOTANICALS AND BIO-CONTROL AGENTSIN CONTROLLINGBRINJAL SHOOT AND FRUIT BORER (LEUCINODES ORBONALIS GUEN) IN BRINJAL

Abstract

The experiment was conducted at the Farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to study the effect of some botanicals and bio-control agents in controlling Brinjal Shoot and Fruit Borer (BSFB) during the period from April to October 2009. The experiment consists of the following management practices: T1: Neem oil @ 4ml/L of water at 7 days interval; T2: Neem seed kernel @ 300g/L of water at 7 days interval; T3: Trichogramma evanescense @ 0.1g/6 m2 at 7 days interval; T4: Bacillus thuringiensis serovar kurstaki @ 1.5ml/L of water at 7 days interval; T5: Bacillus thuringiensis serovar kurstaki @ 1ml suspension/L of water + Safeclean 2.5 ml/L of water at 7 days interval; T6: Botanical pesticides Safeclean 5 ml/L of water at 7 days interval and T7: Untreated control. The plants treated with T1 treatment (Neem oil @ 4 ml/L of water at 7 days interval), resulted significantly lowest percentage of infested shoot &fruit compared to those of other treatments during early, mid and late fruiting stage. Significantly the highest yield was obtained in plant under the treatment T1. The treatments T2(Neem seed kernel @ 300g/L of water at 7 days interval) and T3(Trichogramma evanescence @ 0.1g/6 m2 after 7 days interval) also gave more or less similar result as treatment T1. The yield contributing characters found highest in T1 treatment for length and girth of fruits, weight of individual fruit, edible portion, non edible portion and yield per hectare. The highest Benefit Cost Ratio was found in T1 may be due to the minimum infestation and cost compared to the other treatment components and the highest yield was produced in this treatment. Length, girth of healthy fruits, individual fruit weight and edible portion of fruit showed significant positive relation with yield of brinjal.