豆卷叶螟及其主要寄生蜂——长颊茧蜂的若干生物学特性

The biological characters of Lamprosema indicata and its parasitoid Dolichogenidea sp.(Hymenoptera:Braconidae)

豆卷叶螟Lamprosema indicata Fabricius是菜用大豆的一种重要食叶性害虫。在福州地区1 a发生4-5代,以老熟幼虫越冬,次年越冬幼虫4月中下旬出蛰。5月中下旬是第1代幼虫危害高峰期,第1代成虫高峰期在6月中旬;第2代幼虫高峰期在6月下旬,7月中旬是第2代成虫高峰期;8月中下旬第3代幼虫盛发,9月上旬是第3代成虫的高峰期;第4代幼虫发生期在9月中下旬,9月下旬10月上旬是第4代成虫盛发期;10月中旬是第5代幼虫的高峰期。豆卷叶螟的主要寄生性天敌有长颊茧蜂Dolichogenidea sp.、广黑点瘤姬蜂Xanthopimpla punctata Fabricius、广大腿小蜂Brachymeria lasus Walker和家蚕追寄蝇Exorista sorbillans Wiede-mann,其中长颊茧蜂是天敌优势种,其田间寄生率最高可达80%,对豆卷叶螟的种群的控制起主要作用。

Lamprosema indicata Fabricius(Lepidoptera: Pyralidae)is an important pest of vegetable soybean.The pest annually develops 4-5 generations in Fuzhou,China.It overwinters with the larvae.The larvae break hibernation in middle or late April.The peak of larval population density of 1st-5th generations in the field was in middle or late May,late June,middle or late August,middle or late September and middle October,respectively.And the peak of adult population density of 1st-4th generations in the field was in middle June,middle July,early September and late September to early October,respectively.Four species of parasitoids,Dolichogenidea sp.(Hymenoptera: Braconidae),Xanthopimpla punctata Fabricius(Hymenoptera: Ichneumonidae),Brachymeria lasus Walker,and Exorista sorbillans Wiedemann were found.Dolichogenidea sp.is a dominant natural enemy,which parasited in the larvae of L.indicata,and its the highest parasitism was about 80%.Dolichogenidea sp.plays an important role in controlling population of L.indicata.