病情与症状本病发生于青森县内的7个町村,主要在津轻半岛一带及太平洋沿岸石町。两年中水稻发病的有六个品种三个品系。发病时期都是分蘖期-幼穗形成期,这段时期大体同时发病。但以后未见病情发展,两年都是到抽穗期病斑就消失了。本病的特征,是在水稻叶片上形成黄色,圆—长圆形的大型病斑,初期呈淡黄 Illness and Symptoms The disease occurs in seven towns and villages within Aomori Prefecture, mainly in the Tsugaru Peninsula area and on the shores of the Pacific Ocean. Two years of rice disease there are six varieties of three lines. The onset of the tillering stage - panicle formation period, during this period generally simultaneously. However, after the disease has not seen the development of two years are heading to lesions disappeared. The disease is characterized by the formation of yellow, round - oblong large lesions on rice leaves, initially pale yellow