桔小实蝇及其寄生蜂消长规律

对福建漳州地区桔小实蝇及其主要寄生蜂的种群消长规律进行了研究.结果表明:桔小实蝇在漳州天宝地区发生期为3～11月,种群高峰为6～9月;寄生桔小实蝇的寄生蜂有4种,各自种群消长与桔小实蝇种群的消长呈跟随效应,其中切割潜蝇茧蜂占已知寄生蜂总量的77.6%,在田间寄生率达11.42%,发生期为5～11月,在已知寄生蜂种类中为优势寄生种群,是控制桔小实蝇的主要蜂种;桔小实蝇和切割潜蝇茧蜂对寄主水果都有明显的选择性,其种群数量关系为:番石榴≈杨桃＞莲雾,表明该蜂更趋向在番石榴和杨桃上的桔小实蝇幼虫上产卵.

Seasonal Incidence of Bactrocera dorsalis and Its Parasitoids in the Field

The seasonal incidence of Bactrocera dorsalis and its major parasitoids were studied by the field investigation in Tianbao,Zhangzhou Prefecture.The results showed that B.dorsalis occurred from March to November each year in the studied area and the peak population took place from June to September.It was made clear that there were 4 species of parasitoids which parasitized on B.dorsalis,and there was a following phenomenon between population variation of each parasitoid and B.dorsalis.It was indicated that Psyttalia incisi was the predominant species of the 4 parasitoids to control B.dorsalis and its population accounted for 77.6% of the total parasitoids samples in the field,which occurred from May to November and its parasitism ratio reached 11.42%.It was found out that both B.dorsalis and P.incisi had obvious preference for infesting and parasitizing,and the population order of P.incisi observed on host plant species was: guava(Psidium guajava) > carambola > rose apple.It was showed that P.incisi preferred of parasitizing on larvae of B.dorsalis infesting on guava and carambola.