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杂交晚稻上黄矮病和普通矮缩病等病毒病,发生较多,为害较重。据南方病区有关单位调查,一致认为杂交晚稻病毒病发病率平均比常规晚稻高3—5倍以上。杂交稻上普通矮缩病的症状,和常规稻相似,也是植株矮缩,分蘖增多,叶色浓绿,叶片上有白色条点等。而黄矮病的症状,容易与气候、生理影响或杂交稻种性等的问题产生混淆,有时因此而贻误了防治。一、杂交水稻黄矮病的诊断杂交水稻黄矮病的症状,除了叶片发黄,呈现黄色条状花叶外,还有与常规稻不同的一些症状。①病叶片与茎秆之间的夹角增大不明显,而常规稻发病叶片与茎秆之间夹角明显增大,叶片有时平展,甚至下
Hybrid late rice yellow dwarf disease and common dwarf disease and other viral diseases, occurred more serious damage. According to a survey conducted by relevant units in Southern Ward, it was agreed that the incidence of late-season hybrid rice virus disease was 3-5 times higher than that of conventional late rice. Symptoms of hybrid rice common dwarf disease, and conventional rice is similar, but also plant dwarf, increased tillers, dark green leaves, white leaves on the leaves and so on. However, the symptoms of yellow dwarf disease are easily confused with the problems of climatic, physiological effects or hybrid rice species, which in some cases delayed the prevention and treatment. First, the diagnosis of hybrid rice yellow dwarf disease Yellow dwarf disease symptoms of hybrid rice, in addition to yellow leaves, showing yellow stripe mosaic, there are some different from the conventional rice symptoms. ① the angle between diseased leaves and stem increased slightly, while the angle between the leaves of conventional rice and stalks significantly increased, leaves sometimes flattened, or even under