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向日葵霜霉病是山西省植物检疫对象.1986年在忻州地区首次发现.主要分布在忻定盆地向日葵春、夏播混种区.带菌种子、病株残体和病田土是该病的初侵染来源.春播向日葵发病较轻,但其病株产生的孢子囊可成为夏播向日葵的再侵染菌源.在夏播后多雨高湿的年份,向日葵幼苗再侵染很严重,发病率高达80%以上.播种晚,连作或相邻种植病害加重.当前生产用品种均不抗病,己筛选出5个高抗油用型杂交种可供生产试种.用瑞毒霉拌种,防治效果可达94%以上.
Sunflower downy mildew is the object of plant quarantine in Shanxi Province.It was first found in Xinzhou area in 1986. It mainly distributed in the spring and summer sowing mixed area of Sunflower in Xinding basin.The contaminated seeds, However, the sporangia produced by the diseased plants could become the source of reintermination of summer-sunflowers.In arid and humid summer after summer sowing, the re-infection of sunflower seedlings was very serious and the incidence rate was as high as 80% or more.Seeding late, cropping or adjacent plant diseases aggravate.Now the current varieties of production are disease-resistant, has been screened five high oil-resistant hybrids available for the production of test species. The effect of up to 94%.