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阿勒泰地区有着良好的生态环境、土壤、水资源条件,是向日葵等经济作物的最佳生产基地。多年来,种植向日葵已成为本地广大农民增收致富的重要途径,但由于连作地较多,霜霉病等病害发生面积和发生程度不断增加,一定程度上影响了向日葵产业的发展。一、症状霜霉病在向日葵整个生长期均可发生,种子发芽至第1对真叶出现是感病的危险期。根据发生时期和症状特点可分为4种类型。1.矮化型
Altay region has a good ecological environment, soil, water conditions, sunflowers and other cash crops is the best production base. Over the years, planting sunflowers has become an important way for the vast majority of peasants in our country to increase their incomes and become rich. However, due to the continuous occurrence of diseases such as downy mildew and the increasing occurrence of diseases, the development of sunflower industry has been affected to a certain extent. First, the symptoms Downy mildew can occur throughout the growing sunflower, seed germination to the first true leaves appear to be susceptible dangerous period. According to the occurrence and symptoms can be divided into four types. Dwarf