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杨柳腐烂病,全国各地均发生,新疆现有杨柳树品种都被感染,行道树受害率一般达50%,最高的达90%,林带、片林、天然林及苗圃中的林木,也都受害.林木一经感染此病,病斑就年年扩大,当病斑横向扩展绕树一周时,即招致死亡.此病有干腐、枯腐两型,以前者发生普遍,症状都是以患部皮层外面散生黑色小点(分生孢子器)开始,在阴雨或空中湿度大时,黑点顶端放射桔红色的胶质丝状物——分生孢子角.干腐型病斑多出现在主干下部或大枝上,初呈暗褐色水渍状,微隆肿,组织松软,手指按压,内部流出无色液体;剥开树皮,可见靸皮部变
Willow rot disease occurs in all parts of the country. Existing varieties of willow trees are infected in Xinjiang. The damage rate of road trees is generally 50% and the highest is 90%. Forest belts, patch forests, natural forests and trees in nurseries also suffer. Once infected with the disease trees, lesion spread every year, when the lesions extend transversely around the tree a week, which led to death.The disease has dry rot, dry rot two types, the former common, the symptoms are based on the outer part of the affected area At the beginning of the black dots (conidia), in the rainy or in the air humidity, the top of the black spots radiate a orange-red colloidal filament - conidia angle. Dry rot lesions appear in the lower part of the trunk Or large branches, the beginning of the dark brown water stains, micro-swelling, soft tissue, finger pressure, the internal out of colorless liquid;