桉树枝瘿姬小蜂中国本地自然天敌调查与捕食性天敌的捕食观察

文章首次报道了桉树枝瘿姬小蜂在中国的捕食性自然天敌。2009年9-12月,以华南农业大学校园窿缘桉（Eucalyptus exserta）和巨园桉（Eucalyptus grandis×E.tereticornis）DH201-2林分为材料,进行林间肉眼观察,并收集桉树枝瘿姬小蜂（Leptocybe invasaFisher＆La Salle）虫瘿羽化出的昆虫,解剖观察虫瘿中的昆虫,调查桉树枝瘿姬小蜂自然天敌。结果发现：3种桉树枝瘿姬小蜂捕食性自然天敌分别为冠猫跳蛛（Carrhotus coronatus）、斜纹猫蛛（Oxyopes sertatusL.Koch）和圆蛛（Cyrtarachnesp.）,其中冠猫跳蛛是优势种。对冠猫跳蛛捕食桉树枝瘿姬小蜂情况进行野外和室内试管观察,统计其捕食量为野外4.8头/头.h、试管内0.36头/头.h。未发现桉树枝瘿姬小蜂寄生性天敌。

Investigations of natural enemies in China of Leptocybe invasa Fisher & La Salle and observations on predating of the predatory natural enemy

Investigations to find out natural enemies of Leptocybe invasa Fisher & La Salle were carried out during the months of September through December 2009, basing on two species of Eucalyptus exserta and Eucalyptus grandis × E. tereticornis DH201-2 from College of Forestry, South China Agricultural University, and three methods of collecting insects emerged from Leptocybe invasa Fisher & La Salle galls, dissecting galls and eye-searching in the forests. Three kinds of spider species are discovered to be predatory natural enemies of Leptocybe invasa Fisher & La Salle, which are Carrhotus coronatus, Oxyopes sertatus L. Koch and Cyrtarachne sp., of which Carrhotus coronatus is predominant species. The observations on Carrhotus coronatus predating both in the field and within test tube show that an individual Carrhotus coronatus predates Leptocybe invasa Fisher & La Salle 4.8head/h in the field and 0.36head/h within test tube. This is the first report of predatory natural enemy of Leptocybe invasa Fisher & La Salle in China. There is not parasitical natural enemy found in this study.