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向日葵霜霉病是一种有重要经济影响的病害,在世界上几乎所有了;陆国家都有分布。 我国1963年刘惕若等在黑龙江省首次报导此病害,并指出在该省的牡丹江和合江农垦区普遍发生,个别地区为害较重。其后再未见有报导。1972年以来我们在吉林省白城、四平、通化、长春等地区,相继发现此病害。此病在我省虽零星发生,但年年可见。主要表现有以下几种症状:
Sunflower downy mildew is a disease that has a significant economic impact, almost all in the world; land is distributed throughout the land. In 1963, Liu Tiiruo et al. First reported the disease in Heilongjiang Province and pointed out that it was common in the Mudanjiang and Hejiang reclamation areas in the province, causing serious damage in some areas. No further reports have been made thereafter. Since 1972, we have found the disease in Baicheng, Siping, Tonghua and Changchun in Jilin Province. Although this disease sporadically occurs in our province, it can be seen every year. The main symptoms are the following: