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水稻旱育苗技术在我国北方水稻产区推广很快,对提高水稻产量有重要作用。但在旱育苗过程中,苗床有多种病害发生,严重威胁水稻生产。几年来我们对旱育苗秧苗病害进行了调查和防治,取得良好效果。一、发病种类及主要病状 (一) 侵染性病害 1.稻苗立枯病。由多种真菌侵染而引起的。稻苗立针期开始发病,到1.5叶期发病最严重。症状是芽锥呈浅黄色,病苗叶片卷缩呈针状,根变褐色,茎基部有褐色棉毛
Rice drought nursery technology in northern China to promote rice production areas quickly, to improve rice production has an important role. However, in the process of drought nursery, seedbed has a variety of diseases, a serious threat to rice production. In recent years, we carried out the investigation and prevention and cure of the nursery seedling disease of dry nursery and achieved good results. First, the type of disease and the main symptoms (A) of the Infectious Diseases 1 rice seedling blight. Caused by a variety of fungal infections. Rice seedling start needle onset, to 1.5 leaf stage incidence of the most serious. Symptoms are light yellow cone buds, sick leaves crimp acicular, root brown, stem base brown hair