Biorational management of tomato fruit borer, Helicoverpa armigera (Hübner) in winter under field condition of Bangladesh
2019
Biswas, Dinasree | Uddin, Mohammad Mahir | Ahmad, Masum
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.
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