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捕食性的普通草蛉Chrysoperla sp.(carnea group)和安平草蛉Mallada desjardinsi(Navas)(脉翅目:草蛉科)的寄主-生境定位取决于其觅食行为以及对各阶段释放的植物气味的行为反应。本研究调查了这两种交配的草蛉成虫以及取食棉花的扶桑绵粉蚧Phenacoccus solenopsis的反应,以便了解它们之间的三重营养关系。结果表明:草蛉雄虫和雌虫均能感受到棉花植株释放的绿叶挥发物;植株的各个阶段均可使捕食性昆虫和绵粉蚧定位。在受绵粉蚧为害的棉叶上饱和烃含量高,说明草蛉成虫的反应更为强烈;在植株受为害期和开花期释放捕食性昆虫,可提高田间捕食性昆虫的作用。这些结果提示有效的生物防治取决于捕食性昆虫在植株上的天然定殖能力以及对害虫的吞食能力。
The host-habitat location of the predatory common grass chrysoperla sp. (Carnea group) and Mallada desjardinsi (Navas) (Mycenales) is dependent on their foraging behavior and on the plant odors released at each stage The behavioral response. The present study investigated the response of the two mating adult members of the genus Ruditapes and the cotton-eating Phenacoccus solenopsis, to understand the trophic relationship between them. The results showed that the green leaf volatiles released from the cotton plants could be felt by both the males and females, and the predatory insects and mealybugs could be located in all stages of the plant. The high content of saturated hydrocarbons on cotton leaves contaminated by mealybugs showed that the response of the adults was stronger. The release of predatory insects during the period of detritus and flowering increased the effect of predatory insects in the field. These results suggest that effective biological control depends on the natural colonization of predatory insects on plants and their ability to swallow pests.