论文部分内容阅读
主要病害及其防治1.枣锈病为枣树重要的流行性真菌病害。夏季高温多雨年份,该病常大流行,受害严重树多于8～9月份叶片落光,果实不能正常成熟,提前脱落,产量大减,果实品质差,且造成树体衰弱。症状:初发病时,叶片背面出现淡绿色小点,后渐变为黄褐色凸出斑块,即夏孢子堆,其形状不规则,多分布于主脉两侧、叶基、叶尖处,有时病斑连接成条状或片状。被害叶片正面初期
The main diseases and their prevention and control 1 jujube rust jujube important epidemic fungal diseases. The hot and rainy summer months, the disease pandemic, severely damaged trees more than 8 September leaf falling, the fruit can not be normal maturity, early off, the yield decreased, poor fruit quality, and the resulting tree debilitating. Symptoms: The first incidence, the leaves appear light green dots on the back, after the gradual change to brown patches, that is, summer spores, irregular shape, and more distributed in the main vein on both sides of the leaf base, leaf tip, and sometimes Lesions connected into a strip or sheet. Victim leaves positive early