Biorational management of tomato fruit borer, Helicoverpa armigera (Hübner) in winter under field condition of Bangladesh

Abstract

An experiment was conducted during the period of December 2014 to March, 2015 in the Entomology Field Laboratory, Department of Entomol- ogy, Bangladesh Agricultural University on the management of tomato fruit borer, Helicoverpa armigera (Hübner) using different biorational insecticides on winter tomato variety BARI tomato-2 in Bangladesh. Efficacy of seven different biorational insecticides viz. Neem oil, Mahogany oil, Karanja oil, Ambush 1.8 EC, Libsen 45 SC, Emamectin benzoate 5 SG and Beauveria bassiana were evaluated on the basis of percentage of fruit damage and percentage in- crease/decrease of yield. All the biorational insecticides were significantly effective in comparison to control treatment. Besides, among seven insec- ticides; Emamectin benzoate 5 SG provided the best result with the lowest cumulative mean percentage fruit infestation (20.95% and 17.24% based on number and weight, respectively). Percentage reduction of infested fruit was the highest (57.50 and 62.38%, by number and weight, respectively) in Emamectin treated plots. Similarly the highest percentage protection (58.99 and 63.06% by number and weight, respectively) of infested fruit was also found from the Emamectin benzoate treatment. But Libsen 45 SC revealed the highest efficacy on marketable fruit yield (20.23 t ha⁻¹) compared to other treatments. So, Emamectin benzoate and Libsen both might be used to manage tomato fruit borer effectively.