数字农科院2.0

Impact of summer temperatures on Agasicles hygrophila, a key biocontrol agent of the invasive weed Alternanthera philoxeroides in Hunan province, China

文献类型： 外文期刊

作者： Jisu Jin;Meiting Zhao;Hong Zhang;Yiran Liu;Fanghao Wan;Zhongshi Zhou;Jianying Guo

作者机构：

关键词： Alligatorweed; Biological control; Egg-hatch rate; Fecundity; Pupation rate; Survival rate

期刊名称： Entomol. Gen.

ISSN： 0171-8177

年卷期： 2021 年 41 卷 1 期

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收录情况： JCR（2021版）

摘要： Agasicles hygrophila, a leaf-feeding Chrysomelid beetle, was introduced into China in 1986 as a biological control for Alternanthera philoxeroides (alligatorweed), a noxious perennial invasive weed. However, Hunan’s Ag. hygrophila populations decrease suddenly during summers (at high temperatures), leading to the inefficient control of alli-gatorweed. To investigate this phenomenon, herein, the effects of four different temperatures (26, 30, 36, or 39°C) on the reproductive capacity and egg-hatch, pupation, eclosion, and adult survival rates of Ag. hygrophila were explored. The effects of four different durations of each temperature treatment (4, 8, 12, or 16 days) were investigated. All the studied parameters were significantly affected following each of the four temperature and time treatments. At 30°C, the egg-hatch, pupation, and eclosion rates were considerably lower than those in the control group at 26°C. However, there were no significant differences in the number of eggs laid and the adult survival rates. Heat-shock at 36°C and 39°C led to significant decreases in the number of eggs laid, and the egg-hatch, pupation, eclosion, and adult survival rates compared to those at 26°C. Furthermore, high temperature had the greatest effect on Ag. hygrophila pupae, and the eclosion rate was close to zero; this may have caused the sharp decrease in the Ag. hygrophila population. The results will help better understanding the impact of biological control on Al. philoxeroides during summer temperatures and will also support optimization of biocontrol strategies, notably for the release of biocontrol agents across different geographical regions with different climates. © 2020 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany.

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