一、枣锈病(一)症状该病主要危害叶部,严重时也危害果实,导致叶片提早脱落,影响光合产物的积累,使树体营养储备不足。发病初期,叶片背面散生淡绿色小点,逐渐变为淡灰褐色或黄褐色,病斑突起,发病先从枣树下部开始,逐渐向上蔓延,7、8月份叶片开始脱落。 First, jujube rust (A) Symptoms The disease is the main endanger the leaves, also seriously endangering the fruit, leading to early leaves off, affecting the accumulation of photosynthetic products, so that the lack of nutritional reserves of trees. Early onset, leaf back scattered light green dots, gradually become light gray brown or brown, spot protruding, the incidence of jujube began from the lower part of the first, gradually spread upward, July and August leaves began to fall off.