EVALUATION OF SOME SELECTED BOTANICALS AND CHEMICAL INSECTICIDES FOR THE MANAGEMENT OF BRINJAL SHOOT AND FRUIT BORER (Leucinodesorbonalis Guenee.)

Abstract

An experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University (SAU), Sher-e Bangla Nagar, Dhaka, to evaluate of some botanicals and chemical insecticides for the management of brinjal shoot and fruit borer (Leucinodes orbonalis Guenee.) during October, 2009 to April, 2010. The experiment comprised seven (7) treatments viz. (i) T1= Application of Mehogoni oil @ 5ml/L of water, (ii) T2 = Application of Mehogoni oil @ 3ml/L of water, (iii) T3 = Application of Neem oil @ 5ml/L of water, (iv) T4= Application of Neem oil @ 3ml/L of water, (v) T5= Application of Marshal 20 EC @ 2ml/L of water, (vi) T6= Application of Ripcord 10 EC @ 1ml/L of water and (vii) T7= Untreated control. Each application was done at 28 days after transplanting and repeated at 7days interval. The experiment was set up in Randomized Complete Block Design with three replications. Data on different growth and yield parameters were recorded and analyzed statistically. Results under the present experiment represented that the lowest shoot infestation (3.82%), lowest fruit infestation by number (12.29%) and by weight (8.73%), maximum total fruit yield (31.89 t/ha), lowest infested fruit yield (2.78 t/ha), highest healthy fruit yield (29.11 t/ha), highest fruit length (28.03cm), girth of fruit (12.82cm) and weight of edible portion of infested fruit (152.36 g), highest adjusted net return (Tk. 402540.00) and highest BCR (11.45) were achieved by Marshal 20EC @ 2ml/L of water at 28 days after transplanting and repeated 7 days interval (T5) compared to all other treatments. The highest percent reduction of shoot infestation (72.18%), the highest percent (%) reduction of fruit infestation by number (62.02%) and by weight (72.12%), percent (%) increase of total yield (58.03%), maximum reduction of infested fruit yield (72.14%), maximum increase of healthy fruit yield (185.39%), highest percent (%) increase of fruit length (18.57%), girth of fruit (27.69%) and weight of edible portion per infested fruit (129.67%) over control were also achieved by Marshal 20EC @ 2ml/L of water at 28 days after transplanting and repeated 7 days interval (T5). Thus it is said that among the treatments T5 (Application of Marshal 20 EC @ 2ml/L of water after water 28 days after transplanting and repeated at 7days interval) showed the best performance for controlling brinjal shoot and fruit borer.