昆明地区分瓣臀凹盾蚧天敌种类研究初报

Study on Phenacaspis kentiae Kuwana's Natural Enemies in Kunming

分瓣臀凹盾蚧(PhenacaspiskentiaeKuwana)是茶花、桂花的重要害虫。其捕食性天敌昆虫4种,隶属于鞘翅目的瓢虫科、方头甲科和草蛉科,其中日本方头甲(CybocephalusniponicusEndr by Yonge)为主要捕食性天敌;寄生性天敌昆虫有4种,隶属于膜翅目小蜂总科的跳小蜂科和蚜小蜂科,其中糠片蚧恩蚜小蜂[Encarsiainquirenda(Silvestri)]为分瓣臀凹盾蚧的主要寄生蜂,其数量占寄生蜂总数的95 3%,其数量的变化也反映了寄生蜂的整体数量的消长变化。寄生蜂对分瓣臀凹盾蚧的自然寄生率为10 1%,捕食性天敌对分瓣臀凹盾蚧的自然控制率为78%。自然条件下,天敌昆虫对分瓣臀凹盾蚧的种群数量有一定的控制作用。

Phenacaspis kentiae Kuwana is the important insect pest of camellia,sweet-scented osmanthus. It was found that there were 4 species of predatory natural enemies belonging to Coccinellidae, Cybocephalidae and Chrysopidae, and 4 species of parasitic natural enemies belonging to Encyrtidae and Aphelinidae respectively. Cybocephalus niponicus Endrby-Yonge was the superior predator in number of P.kentiae. Encarsia inquirenda (Silvestri) was the superior parasitoid of the pest, which occupied 95.3% of all parasitoids in number. The parasitic rate of parasitic natural enemies was 10.1%. The control rate of predatory natural enemies came up to 78%. Under natural conditions, natural enemies were effective on the control of the population of Phenacaspis kentiae Kuwana.