温度对六斑平颜蚜蝇种群生长发育及繁殖的影响

六斑平颜蚜蝇Eumerus seximaculatum Huo&Liu是一种对肉苁蓉造成毁灭性危害的蛀茎害虫,本研究旨在探索温度对六斑平颜蚜蝇生长发育及繁殖影响,为其预测预报和防治提供依据。在室内测定了六斑平颜蚜蝇在16、20、24、28和32℃5个恒温处理下各发育阶段的发育历期、存活率、繁殖力以及种群增长指数。结果表明,在16~32℃恒温范围内,六斑平颜蚜蝇均能完成整个世代,各虫态的发育历期随着温度升高逐渐缩短;而存活率、繁殖力、种群增长指数随着温度升高先增多后减少。28℃时世代存活率、每雌平均产卵量、预计下一代产虫数、种群趋势指数均最大,分别为66.67%、150.77粒、2277.25头、34.68,说明28℃为六斑平颜蚜蝇种群增长的最适宜温度。

Two new species in the genus Eumerus Meigen(Diptera:Syrphidae)from Inner Mongolia,China

This paper describes two new species in the genus Eumerus Meigen,1822(Diptera:Syrphidae)from Alashan Right Banner of China.Eumerus alxaensis Huo&Liu sp.nov.is similar to E.tuberculatus Rondani,but differs from the latter by mesonotum without whitish pollinose middle stripes,tergite 4 with distinctly L-shaped whitish pollinose bands,eyes with long and dense hairs in male but shorter in female,hypandrium ventrally with a semicircular sheet protruding on the middle of lateral margins.Eumerus seximaculatum Huo&Liu sp.nov.is allied to E.strigatus(Fallén),but differs from the latter by eyes bare,vertex covered with pale yellow hairs,whitish pollinose bands on broader tergites,sternite 4 of male with deeply concave posterior margin and male terminalia distinctly different.

温度对阿拉善平颜蚜蝇生长发育和繁殖的影响

为明确不同的温度对阿拉善平颜蚜蝇(Eumerus alxaensis Huo&Liu)生长发育和繁殖的影响,本研究测定了在20、24、28、32和36℃5个恒温处理下阿拉善平颜蚜蝇各虫态的发育历期、成虫寿命、产卵期和产卵量等参数,构建了发育速率与温度关系模型,并计算了各虫态的发育起点温度和有效积温。研究结果表明,在20~36℃恒温范围内,阿拉善平颜蚜蝇各虫态的发育历期总体上随着温度升高而缩短,数量表现上在32℃时各虫态发育历期最短,但除成虫期外与36℃处理各发育历期间均无显著差异,线性和Logistic模型均能较好地解释发育速率与温度间的关系。成虫寿命和产卵期均随着温度升高而逐渐缩短,产卵量在28℃条件下最多,达(162.93±22.31)粒。总体上,28~32℃为该蝇生长发育和繁殖的适温范围。该研究结果为阿拉善平颜蚜蝇的预测预报和综合防治提供了依据。