１９９９年６～７月我市葡萄霜霉病大流行，对葡萄产量和品质影响较大。据６月下旬对我市葡萄产区唐先镇调查，葡萄园感病率达６０％以上，田间感病株率达５０％，发病严重的葡萄园叶片发病率５２％，果穗发病率达３５％，严重影响产量和质量。发病特点表现为：盛发期提前，往? From June to July 1999, the pandemic grape downy mildew in our city had a great influence on the yield and quality of grape. According to a survey conducted in Tangxian Town, a grape producing area in late June, the susceptibility rate of vineyards reached more than 60% and the rate of susceptible plants in the field reached 50%. The incidence of serious vineyards leaves was 52% and the incidence of ear was 35 %, Seriously affecting the yield and quality. Incidence of the disease as follows: Shengfa period ahead, to?