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期 刊 ：植物保护学报 1989年

关键词：水稻；纹枯病；产量损失；

Keywords:rice, sheath blight, yield loss,

摘 要 ：在田间人工接种条件下,比较江苏省10个水稻生产品种的纹枯病发病程度及其产量损失率。结果表明:水稻品种间的发病程度和产量损失率均有明显差异。增施氮肥后纹枯病的严重度增加,但对产量的影响则因品种而异。在按株测定7个水稻生产品种的病害严重度与产量损失的关系中获知:用来衡量病害严重度的病级(病斑高度)与产量损失之间有十分密切的关系,从而建立了病级(x)与产量损失率(y)之间的回归方程:y=4.487x-1.416。

Abstract:Ten rice cultivars were tested under field conditions in Jiangsu province for susceptibility tosheath blight and for the yield loss by artificial inoculation.The results showed that both suscep-tibility and yield loss were obviously different among tested

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