Abstract

The cotton aphid, Aphis gossypii, is a major sap sucking insect of cultivated cotton, Gossypium sp. We investigated the effects of temperature on the biological parameters of A. gossypii by fitting different non-linear models to the data obtained from constant temperature experiments carried out between 12 and 32 °C. The pest risk in different geographical areas was simulated using GIS tools and represented by two spatial indices viz. establishment risk index (ERI) and generation index (GI). The results revealed that the development rate as a function of temperature increased linearly until approximately 27 °C, after which it became non-linear. Mean longevity of adult female was highest at 12 °C (10.10 ± 0.33 days) and shortest at 32 °C (3.70 ± 0.14 days). The lower and upper development threshold temperatures predicted for immature development of A. gossypii were 6.24 °C and 34 °C, respectively. The temperatures between 22 and 27 °C were found as favourable range for A. gossypii development, survival and reproduction. Majority of the Indian cotton areas were predicted optimally suitable for establishment and survival of A. gossypii (ERI > 0.6 and GI > 30.0). The risk mapping based aphid management strategy is suggested in the conclusion section of this article.

摘要

棉蚜，Aphis gossypii，是栽培棉花Gossypium sp.的主要吸汁昆虫。我们研究了温度对A. gossypii生物学参数的影响通过将不同的非线性模型拟合到从 12 到 32 °C 之间进行的恒温实验中获得的数据。使用 GIS 工具模拟不同地理区域的有害生物风险，并由两个空间指数表示。建立风险指数（ERI）和世代指数（GI）。结果表明，随着温度的变化，发展速率呈线性增加，直到大约 27 °C，之后变为非线性。成年女性的平均寿命在 12 °C (10.10 ± 0.33 天) 时最高，在 32 °C (3.70 ± 0.14 天) 时最短。预测发育未成熟的下部和上部阈值发展温度棉蚜分别为6.24°C和34°C，。发现 22 到 27 °C 之间的温度是棉球菌的有利范围发展、生存和繁殖。印度棉花区域的大部分被预测最佳地适于建立和存活棉蚜（ERI> 0.6和GI> 30.0）。本文的结论部分建议了基于风险图的蚜虫管理策略。