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稻曲病(Ustilaginoidea virens.)是近年来上升的一种重要病害,过去仅在山区一季中、晚稻上偶有零星发生。近年来,特别是桂朝二号等感病品种的引进和扩大种植,发病面积不断扩大,为害程度逐年加重。1981年赣南全区据18个县(市)统计,二季晚稻发病面积达94万多亩,1982年仅16个县(市)发病面积扩展到126万多亩,占二季晚面积的45.7%。病穗率一般4—5%,高的达15%,严重田块达78%。每个病穗有病粒3—4粒,多的达48粒,严重影响水稻的产量与品质。
Ustilaginoidea virens. Is an important disease that has risen in recent years. In the past, occasional sporadic occurrence occurred on late rice only in the first season of mountainous areas. In recent years, especially the introduction and expansion of susceptible varieties such as Gui and Chao No. 2, the area of disease has been continuously expanding and the degree of harm has been increasing year by year. According to the statistics of 18 counties (cities) in southern Jiangxi Province in 1981, the incidence of late rice in the second quarter reached 940,000 mu. In 1982, the incidence of the disease in 16 counties (cities) expanded to 1.26 million mu, accounting for 45.7% . Disease panicle rate is generally 4-5%, up to 15%, serious field of up to 78%. Each sick panicle has 3-4 grains, more than 48 grains, seriously affecting the yield and quality of rice.