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[目的]为优势种异色瓢虫十九斑变型的保护利用和菜蚜的生物防治提供理论依据。[方法]以甘蓝田异色瓢虫十九斑变型的各龄幼虫及成虫为供试虫源,设5个菜蚜密度,研究异色瓢虫十九斑变型对菜蚜的捕食功能反应。[结果]不同虫态的异色瓢虫十九斑变型对菜蚜的日捕食量差异较大,当菜蚜密度相同时,4龄幼虫捕食量最大,成虫和3龄幼虫次之,各龄幼虫及成虫对菜蚜的捕食功能反应均可以用HollingII型圆盘方程拟合。同一虫态瓢虫的捕食量随着蚜虫密度的增大而相应增大。异色瓢虫十九斑变型各龄幼虫及成虫自身密度对捕食作用的干扰效应明显,符合Hassel-Verley的干扰效应模型。[结论]不同虫态的异色瓢虫十九斑变型对菜蚜的日捕食量差异较大,且随捕食者自身密度的增加而减少。 相似文献
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A survey of species of Homoptera and
Hemiptera as well as its distribution and dynamic in Paulownia woods in Lankao County was
carried out in 1997. Among 27 species,there was 11 species of Hemiptera and 16 of
Homoptera. Results showed that the quantities were significant differences. The
quantities of 6 species was 99.56% of the whole number of insects captured among those
27 species,while the number of Empoasca flavescens (F.) Smaller was 88.8%.
The distribution of insects was in positive correlation to the height of Paulownia canopy.
The population of the insects underwent 3 stages from early May~mid June,late June~mid
September and from late Sept.~Nov. 相似文献
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