【摘要】 本文通过研究雅脊金小蜂Theocolaxelegans在6个不同温度梯度下对米象Sitophilusoryzae幼虫的寄生和取食能力,评价了雅脊金小蜂对米象的控制效果。雅脊金小蜂寄生米象的功能反应结果表明,在17℃～29℃的温度范围内,寄生蜂的寄主处理时间与温度成反比,从0.333天(17℃)到0.063天(29℃)。寄主搜索率也随温度变化而变化,17℃时最低(0.083头天),26℃时最高(1.521头天);当温度升高到29℃,寄主搜索率略有下降;但当温度升高到32℃,寄主搜索率明显下降。温度调节的功能反应模型表明,在26℃～29℃的温度范围内,寄生率较高。所以,在26℃～29℃时,雅脊金小蜂对米象有较好的控制效果。更多还原

【Abstract】 The larval-pupa parasitoid Theocolax elegans was evaluated as a biological control agent against the rice weevil, Sitophilus oryzae, in stored wheat. The parasitization and host-feeding of the parasitoid at six constant temperatures (17-32℃) were determined in the laboratory. The functional response of T. elegans parasitizing S. oryzae was examined over a range of temperatures and host densities. A functional response equation was fitted to each temperature regime. Within the temperature range of 17℃ to 29℃, the handling time was inversely proportional to temperature, and ranged from 0.333 d at 17℃ to 0.063 d at 29℃. Instantaneous search rate also changed with temperature and was the lowest at 17℃ and highest at 26℃. But over 29℃, the instantaneous search rate decreased significantly as the temperature increased. A temperature-mediated functional response equation was fitted to the data, in which handing time was a quadratic function of temperature. T. elegans can parasitize greater numbers of hosts within the temperature range of 26℃ to 29℃.更多还原