薯蓣根结线虫病的初步研究

 山东省荷泽地区薯蓣上根结线虫病发生严重。分离鉴定结果表明,该病的病原线虫是花生根结线虫Meloidogyne arenaria。该病在每年4月末开始发生,线虫在一年内发生完整的4代,完成一代平均约需要40 d,有明显的世代重叠现象。线虫主要在地表以下20~40 cm的土层内分布和为害。当地种植的4个主要品种中,肿脖温发病最重,明豆子发病最轻。

PRELIMINARY STUDY ON THE ROOT-KNOT NEMATODE DISEASE OF YAM

Root-knot nematode disease occurred severely on yam (Dioscorea opposita) in Heze of Shandong Province.The pathogenic nematode was identified as Meloidogyne arenaria mainly by the perineal pattern of female and the stylet of female and male.The disease began to occur at end of April.The nematode completed four entire generations in one growing season. The duration each generation is about 40 d in average and generation overlapping occurred obviously.The greatest population densities of the nematodes occurred in 20-40 cm layer of the soil below the surface.Of the four main cultivars planted locally,Zhongbowen was the most susceptible one to the nematode attack and Mingdouzi the most resistant.