【摘要】 杭白菊白绢病是浙江省杭白菊上的一种严重病害。常年发病率达29.6％～84.1％。该病主要危害杭白菊茎基部,引起皮层腐烂,进而全株青枯死亡。病原菌经鉴定为罗氏白绢小菌核菌Sclerotium rolfsii Saccardo.菌核在10～40℃内生长,以25～30℃生长最好;菌核萌发的pH值范围为2～12。杭白菊产区桐乡县白绢病从6月中旬开始发生,一直持续到11月中旬的收获期,其中8月上旬和8月下旬至9月上旬的压条摘心时期为发病高峰期。压条、摘心和后期偏施氮肥等栽培措施是病害严重的重要因素,高温高湿有利于白绢病发生。防治试验表明:植物生长前期用3％井冈霉素或20％稻脚青,中后期用3％井冈霉素或50％多菌灵防治能控制病害蔓延,在杭白菊生长季节应防治4～6次。更多还原

【Abstract】 Southern sclerotium blight is a severe disease to damage the stembase of white chrysanthemum in Zhejiang. The incidence of disease for an average year is 29.6%～84.1% with appearance at the middle ten days of June, prevailing peak through the first ten days of August to the first ten days of September, and ceasing spread at the harvest period of the middle ten days of November. Cultural practices which are nipping, layering, and over fertilized, especially nitrogen have an important effect to the disease prevailing. The pathogen is identified as Sclerotium rolfsii Saccardo. Fungicidal test show that 3% Jinggangmeisu and 50% Carbendazol have a good result to control the disease.更多还原