（宣城地区林业局盛常顺）银杏茎腐病常发生于夏季高温炎热的地区。多危害1年生幼苗，2年生苗也能感病。感病后，叶茎部生黑褐色病斑，很快延及茎基一圈，使皮层臃肿皱缩坏死，养分输送受阻，叶子自上而下退色垂萎，但不脱落。其后茎部皮层腐烂碎裂，皮层内和木质部上出现许多 (Xuancheng District Forestry Bureau Shengshun Shun) ginkgo stem rot often occurs in hot summer hot areas. More endangered 1-year-old seedlings, 2-year-old seedlings can also be susceptible. After the illness, the leaf stem dark brown spots, and soon extended to the stem base circle, so that the cortex bloated shrink necrosis, nutrient transport blocked, the leaves fade from top to bottom fade, but does not fall off. Subsequent cortex decay and disintegration of the cortex, there are many in the cortex and xylem