向日葵霜霉病是一种具有流行病特征的病害.本病十九世纪末发现于北美,现已传播到美洲、欧洲和中东许多国家,并继续向东扩展.向日葵发病严重时,减产达60%左右.在我国,向日葵被视为小油料作物,故对其病害研究很少.刘惕若等1963年曾报道黑龙江有向日葵霜霉病,其它地区尚未见报道.1976年,我区霍城、沙湾、乌鲁木齐、奎屯、奇台、玛纳斯等地均发生向日葵霜霉病;1978年乌鲁木齐市五一农场向日葵发病率达37%;1979年新疆八一农学院实验农场向日 Sunflower downy mildew is a disease characterized by epidemics, which were found in North America at the end of the nineteenth century and have now spread to many countries in the Americas, Europe and the Middle East and continue to expand eastwards. When the incidence of sunflowers is severe, the yield is reduced by 60% So in our country, sunflower is considered a small oil crop, so little research on its disease Liu Tiruo and other reports of sunflower downy mildew in Heilongjiang in 1963, the rest of the region has not been reported in 1976, I District Huocheng, Bay , Urumqi, Kuitun, Qitai, Manas and other places sunflower downy mildew occurred; 1978 Wuyi County, Urumqi, a sunflower farm incidence of 37%; 1979 Xinjiang Bayi Agricultural College experimental farm day