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ABSTRACT: Epilachna beetle Epilachna dodecastigma (Wied.) is a destructive pest on cucurbit in many parts of the world. The experiment was conducted to evaluate the field efficacy of five biopesticides in the Entomology field laboratory of Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur, Bangladesh during March to October 2017. Five treatments of three concentrations as Bioneem plus 1.0 EC and Ecomec 1.8 EC @ 0.05%, 0.10% and 0.15% while oils of neem, karanja and castor @ 5%, 7.5% and 10% were applied. The effectiveness of the treatments against the epilachna beetle was evaluated on the basis of percent reduction of beetle population at 24, 48, 72 and 120 hours after treatments (HATs). The number of beetle population decreased soon after spray but with increasing time the number of beetle population was also increased. However, among the treatments ecomec 1.8 EC at 0.15% concentration proveded the best results upto 67.2% beetle population reduction followed by Bioneem plus 1.0 EC after 120 HATs as compared to control. The highest number of fruits (9.3) was harvested at 0.15% concentrated Ecomec 1.8 EC treated plot as 62.4 kg while the lowest in the control treatments. Therefore, being biopesticides having less or no hazard on human health and environment they might be incorporated for safe control of E. dodecastigma on pumpkin in field conditions.
Keywords: Epilachna dodecastigma, biopesticides, field efficacy, yield, sweet gourd
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