Management of brinjal shoot and fruit borer (Leucinodes orbonalis Guen.) using selected bio-rational insecticides
Md. Simon Islam, Md. Abdur Razzak Choudhury, Md. Abdul Maleque, Md. Fuad Mondal, Kamrul Hassan , Ahasan Ullah Khan
doi: 10.5455/faa.55331 pp: 1025-1031
An experiment was undertaken to know the effectiveness of different bio-rational insecticides for controlling brinjal shoot and fruit borer (Leucinodes orbonalis Guenee) under field conditions during winter season 2017-18. The different treatments were Bioneem 1% EC (Azadirachtin 1000ppm @1mlL-1 (T1) Noclaim 5 SG (Emamectin Benzoate) @1mlL-1 (T2), Tracer 45 SC (Spinosad) @0.4 1mlL-1 (T3), Suntec 1.8 EC (Abamectin) @1.2 1mlL-1 (T4) and untreated control (T5). The results revealed that the treatments Spinosad (T3), Abamectin (T4) and Emamectin Benzoate (T2) were effective to suppress brinjal shoot and fruit borer infestation in brinjal field. The rate of shoot infestation was observed 6.25% and 26.01% in Spinosad (T3) treated and control plot, respectively. The lowest fruit infestation (6.98%) by number and (9.32%) by weight was recorded in Spinosad (T3) treated plot. Reduction rate of fruit infestation over control was 82.82, 51.19, 41.15 and 38.17% by number and 66.11, 43.75, 33.13 and 24.44% by weight in Spinosad (T3), Emamectin Benzoate (T2), Abamectin (T4) and Azadirachtin (T1), treated plot, respectively. The yield in different treatments ranged from 22.02 – 32.52 t/ha. Healthy fruits yield increase over control varied from 19.36 to 85.46%, where the highest increase was found in Spinosad (T3) treated plot and the lowest in Azadirachtin (T1). The highest adjusted net return and Benefit Cost Ratio of Tk. 2,61564 and 11.08, respectively were obtained from Spinosad (T3) treated plot. The lowest Benefit Cost Ratio was 2.66 in Azadirachtin (T1) treated plot. Among the four bio-rational inecticides Tracer 45 SC (Spinosad) showed the highest efficacy and it could be used against brinjal shoot and fruit borer in brinjal production.
Keywords: Brinjal, shoot and fruit borer, bio-rational insecticides, management