山桂花腐病菌为害叶片、新梢和幼果。叶片上,展叶后4～5天即可出现褐色小班,经6～7天后病斑可扩展到病叶的1/2～2/3。天气潮湿时,在病斑上生出灰白色霉层,即病菌的分生孢子。在新梢上,初生褐色至红褐色病斑,当病斑环绕新梢一周时,新梢上部萎蔫枯死。在幼果上,落花后10天左右幼果果面出现褐色病斑,逐渐扩大,直至整个果实变成暗褐色脱落。 Shan Guihua rot fungus damage leaves, shoots and young fruit. Leaves, leaves 4 to 5 days after the emergence of brown small class, by 6 to 7 days after the lesion can be extended to the diseased leaves 1/2 ~ 2/3. When the weather is wet, it produces grayish mildew on the lesion, which is the conidia of the germs. In the shoots, newborn brown to reddish brown spot, when the spots around the shoot a week, shoot the upper wilt died. In young fruit, after about 10 days after falling flower seedlings appear brown spot, gradually expanded until the whole fruit becomes dark brown off.