EFFECTIVENESS OF SOME INSECTICIDES TO CONTROL BRINJAL SHOOT AND FRUIT BORER (Leucinodes orbonalic Guenee)

Abstract

An experiment was conducted at the Sher-e-l3angla Agricultural University, Bangladesh during December 2005 to May 2006 to evaluate some insecticides for their efficacy to control brinjal shoot and fruit borer (Leucinodes orbonabs Guenee). The study comprising five treatments including a control and laid out in a Randomized Complete Block Design (RCE3D). Among the treatments, T3 (Marshal 20 EC applied at 28 (lays after transplanting and repeated at 7 days interval) performed best results in terms of reduction of shoot infestation, fruit inibstation and infestation intensity, as well as yield protection. It ensured 65.18% reduction in shoot infestation over control and had only 2.74% shoot infestation. Maximum reduction in fruit infestation (95.38%) was obtained in 'I'3 over control. It also ensured the highest yield of 24.55 t/ha with maximum increase (163.75%) of healthy fruit yield, this was lollowed by T.I. 17 and T1 giving significantly lower yield such as 21.95 tlha, 21.25 i/ha and 19.44 i/ha respectively having no significant difference in 12 with Ii and T, with '14 where the control was 15.88 t/ha. The infested fruit belonging to Scale 4 was nil and Scale I was 50.00% in 'l'3. While those belonging to Scale I was 47.06%. 44.44% and 41.18% in T. T1 and 12 respcctively as against 12.50% to Scale 4 and 37.50% to Scale I in control. The Benefit Cost Ratio (13CR) was the highest (21.33%) in case of 'l'.i which was much higher than all other treatments.