Population growth parameters of the cabbage aphid,Brevicoryne brassicae (L.) (Hemiptera: Aphididae), exposed to sublethal doses of thiacloprid |
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Authors: | Mehdi Taheri Sarhozaki |
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Institution: | Faculty of Agriculture, Department of Plant Protection, Urmia University, Urmia, Iran. |
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Abstract: | The cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae) is a major pest of cabbage in the world. In this study, the influence of thiacloprid on population growth parameters of B. brassicae using demographic toxicology by leaf spray method was determined. The LC50 values and confidence limits for thiacloprid were 274.89?ppm (185.22–479.22), respectively. To evaluate the sublethal effect of this insecticide on population growth parameters of cabbage aphid, LC25 and LC10 concentrations of thiacloprid were used at 76.44 and 23.52?ppm, respectively. Also The LC50 value of this insecticide on the life table estimates was measured. Experiments were carried out in the laboratory at 23?±?1?°C, 60?±?5% RH and 16:8 (L:D) photoperiod on cabbage seedlings, Brassica oleracea, var. capitata L. Intrinsic rates of increase (rm) were lower in thiacloprid treatment than in controls. The mean generation time and doubling time were also lower in populations treated with insecticide than in controls. There was a considerable reduction in the average numbers of nymphs reproduced per female as compared with the control. The average longevity of female adults in the control was significantly different (p?<?0.05) from those treated with thiacloprid. According obtained results, thiacloprid is a good choice for control of the B. brassicae. |
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Keywords: | Brevicoryne brassicae cabbage life table sublethal doses of thiacloprid |
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