楸树根结线虫病及其病原线虫的初步研究

作者自1986年5月至1987年11月对山东蒙阴县境内天麻林场等地的楸树根结线虫病的感染率、危害、症状及其病原线虫种类进行了调查,并通过对病原的雌虫、雄虫和二龄侵袭期幼虫的形态观察、测量、寄主反应及北卡罗来纳鉴别寄主试验,确认中山寺林场楸树根结线虫病病原为爪哇根结线虫(Meloido-gyne javanica(Treub,1885),Chitwood,1949),杨庄苗圃病原为北方根结线虫(M.hapla Chitwood,1949),而天麻林场与蒙阴县苗圃病原主要为以上二种根结线虫,其中以爪哇根结线虫为优势种,偶见极少量南方根结线虫(M.incognita Chitwood,1949)。本文还对二种主要病原线虫的重要鉴别特征作了较详细的描述,为楸根结线虫病的防治提供了必要的基础资料。

A PRELIMINARY STUDY ON THE ROOT-KNOT NEMATODE DISEASE OF CATALPA BUNGEI AND THEIR PATHOGENETIC NEMATODES

Root-knot nematode disease is an important disease of Catalpa bungei.Up to the present,the root-knot nematode disease of Catalpa bungei wasnot reported in China.In the years 1986-1987,the infective percentages,damages and symptoms of root-knot nematode disease of Catalpa bungeiwere investigated by the authors in Tianma tree farm,Zhonshansitree farm,Mengying tree nursery and Yangzhuang tree nursery,MengyingCountry,Shandong Province.According to the combination of methodsto identify the species of genus Meloidogyne by The International Meloi-dogyne Project,the species of pathogenetic nematodes were identified.They are M.javanica in Zhongshansi tree farm and M.hapla in Yangzh-uang tree nursery.The pests in Tianma tree farm and Mengying treenursery are mainly M.javanica and M.hapla but sometimes M.incognita is occasionly found.The present paper also describes and compares diagnostic charactersin mature females,males and second-stage juveniles of the two mainroot-knot nematodes.