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稻瘟病在我省普遍发生,而丹东、抚顺、新宾及开原等地发生较重,尤其是东沟县年年发生,成为该县水稻增产的严重障碍。 稻瘟病因发生时期和危害部位不同,可分为苗稻瘟、叶稻瘟、穗茎瘟、枝梗瘟。其中叶瘟和穗茎瘟对产量影响很大。叶瘟多危害叶片,常发生在分蘖盛期,拔节期及幼穗形成期。病斑一般呈梭形,四周黄褐色,中心灰白,两端有褐色坏死线向外伸延成条状。潮湿时,病斑背面也产生灰褐色霉层,发病严重时,造成白穗。
Rice blast occurred frequently in our province, while heavy discharge took place in Dandong, Fushun, Xinbin and Kaiyuan, especially in Donggou County, which became a serious obstacle to the rice yield increase in this county. Blast disease due to the occurrence of different parts and hazards can be divided into seedling blast, leaf blast, ear stem blast, branch stem blast. Among them, leaf blast and ear stem blast affected the yield greatly. Leaf blast more dangerous leaves, often occur in the tillering stage, jointing and panicle formation period. Lesions are generally fusiform, surrounded by brown, the center of gray, brown necrosis at both ends of the line extending outward into a strip. Moist, the back of the lesion also produces gray brown moldy layer, severe disease, resulting in white spike.