Toxicity of spinosad against developmental stages of Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae)
محل انتشار: Journal of Crop Protection، دوره: 3، شماره: 2
سال انتشار: 1393
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 111
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شناسه ملی سند علمی:
JR_JCP-3-2_003
تاریخ نمایه سازی: 13 آبان 1402
چکیده مقاله:
Colorado potato beetle, Leptinotarsa decemlineata is one of the major insect pests of potato. Toxicity of spinosad, as a bio-rational insecticide, was investigated against various developmental stages of this pest. Bioassays were conducted by using the eggs, neonates, first, second, third and fourth instar larvae and adults. The potato leaves were impregnated with different concentrations of spinosad and applied for the adults and different larvae bioassays. The eggs were tested through dipping its masses into the insecticide solutions. LC۵۰ values of neonates, first, second, third and fourth instar larvae and unsexed adults after ۲۴ hours were ۲.۰۶, ۳.۱۹, ۴.۷۵, ۶.۴۶, ۲۰.۲۴ and ۱۱.۹۷ ppm (of commercial formulation), respectively. Results show that spinosad did not possess any ovicidal effects and the fourth instar larvae and neonates were the most tolerant and the most susceptible stages, respectively. Susceptibility of the neonates (up to ۲۴ hrs after hatching) was significantly higher than that of first instar larvae (۲۴-۴۸ hrs after hatching). Developmental stages of Colorado potato beetle responded differentially to this insecticide. Since the control of L. decemlineata mostly relies on early season measures against the most susceptible stage(s), by considering no ovicidal effect, our results propose a limited interval, for avoiding the highly tolerant larvae.
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نویسندگان
Mahmoud Mohammadi Sharif
Department of Plant Protection, Sari University of Agricultural Sciences and Natural Resources, P. O. Box: ۵۷۸. Sari, Iran.
Mir Jalil Hejazi
Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
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