科研之友
微信
新浪微博
Facebook
分享链接
摘要
An invasive sawfly Aproceros leucopoda Takeuchi, 1939, which originates from East Asia, has colonized elms (Ulmus spp) in Austria, Hungary, Poland, Romania, Slovakia and the Ukraine, at least since 2003. In Europe, the larvae can completely defoliate native and non-native elm trees and may cause at least partial (dieback Field observations indicate that elms are infested independent of then age and site characteristics The life cycle of A leucopoda is described based on material reared in Hokkaido, Japan. Parthenogenetic reproduction, short life cycle of summer generations and the ability to produce four generations per year result in the production of numerous piogeny The evolution of a seasonal dimorphism in head morphology, a simple cocoon that is attached directly to the host plant and a short period spent in the cocoon stage during summer, are putative apomorphies shared by Aproceros Takeuchi, 1939 and Aprosthema Konow, 1899 These traits reduce developmental costs and contribute to the proliferation of A leucopoda No specialized parasitoid, that can effectively reduce outbreaks of this species, is known It is likely that this pest will spread into central and south-western Europe Further monitoring of A leucopoda is required to assess future range extensions in Europe, its exacerbating effect on Dutch elm disease and to Find a suitable biocontrol agent Concise keys to imaginal and larval stages are presented that will facilitate the identification of A leucopoda
- 出版日期2010
