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一、发生及危害 恶苗病是水稻常见病害,近年来有逐渐加重的趋势。据调查,全省普遍发生,发病重的秧田发病率达60％以上,本田发病率达30～40％,严重威胁着水稻生产。 恶苗病症状不同可分为四种类型:徒长型、矮化型、“正常型”、早穗型等,我省历来以徒长型为主,一般较健苗高1/3,株植细弱,叶片和叶鞘狭长,呈淡黄绿色,根毛少。重病苗多在移栽之前或移栽之后不久死去。在枯死病苗靠近地面部分产生淡红色或白色粉状物。但近年来矮化型和“正常型”有了明显的增长。所谓矮化型较正常植株略矮;“正常型”植株高矮与健株基本一致,早穗型只是提早抽穗,故这三者在秧田和本田生育
First, the occurrence and harm Bakanaemia is a common disease in rice, in recent years has gradually increased the trend. According to the survey, the province is widespread, the incidence of heavy seedling incidence of more than 60%, Honda incidence of 30 to 40%, a serious threat to rice production. Different symptoms of ecstasy can be divided into four types: leggy type, dwarf type, “normal type”, early panicle type, etc. The province has always been mainly of leggy type, generally 1/3 higher than that of Jianmiao, , Narrow blade and sheath, pale yellow-green, root hair less. Heavy seedlings and more before transplanting or died soon after transplanting. In the dead seedlings near the ground part of the produce pink or white powder. However, in recent years dwarfed and “normal” have seen a marked increase. The so-called dwarf type is slightly shorter than the normal plant; “normal” plant height and plant basically the same, early panicle is only early heading, so these three in the seedling and Honda reproductive