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1960～1962年在牡丹江垦区的农场向日葵地里发现此病。1979年在尚志县也有发现。据辽宁农科院在74-4-6品种上调查,发病率为3％。霜霉病是向日葵毁灭性病害,必须引起足够重视。霜霉病的病原菌是藻状菌纲,霜霉目,单轴霉属的一种。此病菌只寄生在向日葵属的一年生的植物上,是专化性真菌。可侵害向日葵的所有部分,病的症状在向日葵地上部分有比较明显的特征。发病时间较早,在
1960 ~ 1962 in Mudanjiang reclamation area farm sunflower found in the disease. In Shangzhi County in 1979 also found. According to Liaoning Academy of Agricultural Sciences 74-4-6 varieties on the survey, the incidence rate of 3%. Downy mildew is a devastating disease of sunflower and must attract enough attention. Downy mildew pathogen is algae Ganglia, downy mildew, a genus of the genus. This pathogen is parasitic only in annuals of sunflower plants, is a specialized fungi. Sunflower can infringe on all parts of the symptoms of the sunflower above ground parts have more obvious features. The onset of time earlier