Efficacy of spinosad for the management of mustard wheat aphid species
Md. Abdullah Al Masum, Md. Tariqul Islam, Md. Imran Hossain, Krishna Rany Das, Masum Ahmad, Md. Mahfuzul Hasan, Nayan Chandra Howlader
Abstract: Aphids are major pests of mustard and wheat crops, causing significant yield losses worldwide, necessitating effective management strategies. Spinosad, a bio pesticide with a unique mode of action, offers an environmentally friendly alternative for pest control. A study was conducted in the Insect Biotechnology and Biopesticide Laboratory, Department of Entomology, Bangladesh Agricultural University, from February 2019 to February 2020, to assess the efficacy of Spinosad (Tracer 45SC) against mustard aphids (Lipaphis erysimi) and wheat aphids (Diuraphis noxia) using a leaf-dip bioassay. Different concentrations of Spinosad were tested, and mortality was recorded at intervals of 24, 48, 72, 96, and 120 hours after treatment (HAT). Results indicated that Spinosad exhibited significant insecticidal activity against both aphids, with the highest concentration (500 ppm) causing maximal mortality. For mustard aphids, mortality increased from 3.33–16.67% at 24 HAT to 36.67–66.67% at 120 HAT, with a maximal mortality of 66.67% at 500 ppm. The LC50 values decreased from 2883.88 ppm at 24 HAT to 232.31 ppm at 120 HAT, indicating increased toxicity over time. Similarly, for wheat aphids, mortality ranged from 10–30% at 48 HAT to 46.67–73.33% at 120 HAT, with a maximal mortality of 73.33% at 500 ppm. The LC50 values fell from 3049.90 ppm at 24 HAT to 140.31 ppm at 120 HAT. LC90 values for both aphids also decreased over time, demonstrating heightened efficacy with protracted exposure. These findings emphasize Spinosad’s potential as an effective insecticide against mustard and wheat aphids, with its lethality increasing substantially over time. The concentration of 500 ppm consistently delivered the highest mortality for both aphids.
Keywords: Bio-rational insecticide; Leaf-dip bioassay; Mustard aphid (Lipaphis erysimi); Spinosad; Wheat aphid (Diuraphis noxia)
Citation: Al Masum, Md. A., Islam, Md. T., Hossain, Md. I., Das, K. R., Ahmad, M., Hasan, Md. M., & Howlader, N., Ch. (2025). Efficacy of spinosad for the management of mustard & wheat aphid species. Bulgarian Journal of Crop Science, 62(2) 96-103
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| Date published: 2025-04-29
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