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6月下旬,即端午节前后,天气开始炎热,容易形成强烈的对流,一般在午后出现骤雨,在田间形成高温高湿的小气候,极易诱发葡萄炭疽病、霜霉病。而此时正值葡萄着色和采收,每串葡萄只要有一个烂果就会降低收购价格,同时葡萄的保存时间缩短,因此,此时的病害控制是能否增收的关键。预防为主、选择特效农药是防治葡萄霜霉病的两个基本原则。因为霜霉病发生之后要彻底扑灭相当困难,而一遇高温高湿又易复发。因此,在着色初期至采收初期,宜每隔5～7天,用杜邦克露600倍液,或抑快净2000倍
In late June, that is, before and after the Dragon Boat Festival, the weather started to become hot and easy to form a strong convection. Generally, a showers appeared in the afternoon and a microclimate of high temperature and humidity was formed in the fields. Anthrax and downy mildew were easily induced. At this moment, the grapes are colored and harvested. As long as there is a rotten fruit in each bunch of grapes, the purchase price will be reduced and the preservation time of the grapes will be shortened. Therefore, the disease control at this time is the key to whether the income can be increased. Prevention, the choice of special pesticides is prevention and control of grape downy mildew two basic principles. Because downy mildew disease to completely extinguished after quite difficult, but a case of high temperature and humidity and easy to relapse. Therefore, the initial coloring in early harvest, it is advisable every 5 to 7 days, with DuPont grams exposed 600 times, or 1000 times faster net inhibition