上海地区土壤线虫类型与西瓜枯萎病的关系研究

Relationship between Types of Soil Nematodes and Watermelon Wilt Caused by Fusarium oxysprium in Shanghai Region

连续两年在上海地区的不同土壤类型进行多点系统取样、分离，初步探明该地区作物根围土壤线虫的优势种类及数量变化。调查显示，在21个取样点6种土壤类型中共发现5种植物寄生线虫，分别为丝尾垫刃属的辣椒丝尾垫刃线虫、圆筒形线丝尾垫刃线虫、平滑垫刃属的喜悦平滑垫刃线虫、根结线虫属的南方根结线虫及头线虫属等，其出现频率达61．9％，数量占调查总量的3．7％；土壤线虫数量随季节变化显著，线虫活动主要集中在4～7月份。通过人工接种，证实了植物寄生性线虫数量与西瓜枯萎病的发病程度呈正相关。

The soil samples were collected from different soil types in Shanghai region for 2 years. The investigation revealed that there were 5 plant parasitic nematodes, such as Fileuchus capasici, Filenchus cylindricus, Psilenchus hilarulus, Meloidogyne incognita, Terylenchus . The appearing frequency and occupancy proportion of those parasitic nematodes were 61.9% and 3.7% in total soil nematodes, respectively. The quantity of soil nematodes changed significantly in different seasons . The soil nematodes were active during April to July. The artifical inoculation indicated that the incidence of watermelon Fusarium oxysprium were positive correlation with the inoculating quantity of plant parasitic nematodes.