EFFECT OF SOME BOTANICALS AND BIOCONTROL AGENTS ON INSECT PESTS OF BRINJAL (Solanum melongena L.) FOR ITS QUALITY PRODUCTION

Abstract

An experiment was conducted at the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the effect of some botanicals and biocontrol agent on insect pests of brinjal (Solanum melongena L.) (BARI Begun-7) for its quality production during the period from October 2021 to April 2022. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Seven treatments, viz. Treatment were T 1 : Neem oil @ 4ml/L of water at 7 days interval; T : Neem seed kernel @ 300g/L of water at 7 days interval; T 3 ii 2 : Sanitation + Trichogramma evanescens at the rate of 1 card/plot at weekly interval (1000 eggs per card); T : Braconid wasps at the rate of 20-25/plot at weekly interval + field sanitation; T 5 4 : Bacillus thuringiensis serovar kurstaki @ 1ml suspension /L of water + Safeclean 2.5 ml/L of water at 7 days interval; T : Botanical pesticides Safeclean 5 ml/L of water at 7 days interval; T 7 6 : Untreated control was included in this study. In case of different treatments performance, T (Bacillus thuringiensis serovar kurstaki @ 1ml suspension /L of water + Safeclean 2.5 ml/L of water at 7 days interval) showed the best results in terms of incidence of brinjal shoot and fruit borer, number of Jassid plant number of Epilachna beetle plant -1 5 , number of Whitefly plant -1 -1 , number of Aphid plant , yield of healthy and infested fruit, yield contributing characters and yield (t/ha) of brinjal. In term of yield of total fruits, the highest yield of total fruits (50.96 t/ha) was obtained from in T treatment which was closely similar with others treatment except untreated control. There was negative relationship present 5 in number of brinjal shoot and fruit borer, Jassid, Aphid, Epilachna beetle, Whitefly and fruit infestation in number basis with the yield of brinjal, i.e. when the average number of brinjal shoot and fruit borer was increased the yield of brinjal was decreased. Same correlation found for average number of Jassid, Aphid, Epilachna beetle, Whitefly. From the study, it may be concluded that treatment T (Bacillus thuringiensis serovar kurstaki @ 1ml suspension /L of water + Safeclean 2.5 ml/L of water at 7 days interval) was the most efficients than others treatment for the effect of some botanicals and biocontrol agent on insect pests of brinjal (Solanum melongena L.) for its quality production which was followed by spraying of T 5

(Botanical pesticides Safeclean 5 ml/L of water at 7 days interval) treatment.