据省农科院植保所稻病组1971～1972年调查观察,小球菌核病与小黑菌核病通常在田间混合发生,但一般以小球菌核病为主。水稻苗期,早、晚稻都能发病。本田期,早稻(绿肥田)于5月上旬开始发病,后期株发病率一般在5～20%之间,影响产量轻;晚稻于8月上旬开始发病,后期株发病率一般在10～40%之间,重病田株发病率可高达90%以上,常成片枯死,严重影 According to the Provincial Academy of Agricultural Sciences Institute of Plant Protection rice disease investigation from 1971 to 1972, the small ball sclerotinosis and black spider sclerotinia usually occur in the field, but in general the small sclerotinia-based. Rice seedling, early and late rice can attack. Honda period, early rice (green fertilizer field) began to emerge in early May, the late strains generally occur between 5 to 20%, affecting the yield of light; late rice began to attack in early August, the late strains generally 10 to 40% Between the severe disease incidence rate of up to 90%, often into a film dead, severe shadow