两种拟隐脉叶蝉的种群动态及生物学特性初步观察

Population dynamics and bionomics of Pseudonirvana pallida and P. furcilinea.

拟隐脉叶蝉原产于东南亚及我国华南地区 ,近年传入美国并在夏威夷等地暴发成灾。为了从拟隐脉叶蝉的原产地寻找有效天敌 ,以便在传入地开展生物防治 ,作者近年在福建省福州地区对 2种拟隐脉叶蝉的种群动态及生物学特性进行调查。结果获知 :在福州地区的番石榴和相思树上 ,淡色拟隐脉叶蝉和叉线拟隐脉叶蝉年可发生 3～ 4代 ,若虫 5龄 ,夏秋冬初世代重叠 ,没有明显的越冬现象。它们的共同寄主有 :番石榴、甘薯、花生和扁豆。罩养条件下 ,淡色拟隐脉叶蝉也能在相思树上取食并产卵。

Leafhoppers Pseudonirvana originally distributed in Southeast Asia and the South part of China. They were inadvertently introduced to Hawaii and caused severe damage to many crops and endemic plants. In order to find out their effective natural enemies for biological control, the bionomics of Pseudonirvana pallida on guava Psidium guajava, P. furcilinea on Acacia confusa were studied in Fuzhou since 1998. The preliminary results indicated that the 2 species of leafhoppers kept developing without distinct overwintering. They occured with 3～4 generations in a year and the generations obviously overlapped after summer. Nymphs had 5 instars and lasted 40～60 days from summer to the beginning of winter. In Fujian, P. pallida is fond of feeding on guava, and P. furcilinea is on Acacia confusa.