雪松疫霉腐烂病症状是针叶枯黄,极易脱落,同时伴有大量绿针脱落,根末端呈鸡爪状,根部树皮易剥离,树干形成层变褐色。经专家多年研究,发现发病树木多是樟疫霉(Phytophthora cinnamomi)引起根部病害。这种病害,据国外报道可危害100多种针阔叶树种。经多年观察,此病干旱年份很少发生,但在多雨年份,一般是在雷雨季节多雨的年份,8月后,树木表现出发病 Cedar disease rot disease symptoms are yellow, extremely easy to fall off, accompanied by a large number of green needles off, the end of the foot was chicken claw-like, root bark peel easily, the trunk formation brown. After years of research by experts, it is found that most of the diseased trees are root diseases caused by Phytophthora cinnamomi. This disease, according to foreign reports can endanger more than 100 kinds of coniferous and deciduous tree species. After many years of observation, the disease rarely occurs in dry years, but in rainy years, it is generally during the rainy and thunderstorm season, and after August, the trees show disease