灰霉病是一种花木常见病害。我国地域辽阔,南北气候相差很多,地区间、不同季节间灰霉病的发生略有差异。如江浙、上海、福建等地在梅雨季节易流行。而在西南边远云南昆明,8、9月份旬均温度23℃左右,降雨频繁,许多花木如矮牵牛、美人蕉、虾衣花、孔雀草、醉蝶花、大丽花、天竺葵及秋海棠、绣球花、大岩桐甚至玉兰花上,都可见到灰霉病。11月份后,全国气温普遍降低,直至次年2月,是全年温度最低的一 Botrytis is a common disease of flowers and trees. China has a vast territory with a large difference between the north and south climates. There are slight differences in the occurrence of gray mold between regions and different seasons. Such as Jiangsu and Zhejiang, Shanghai, Fujian and other places easy to popular in the rainy season. In the southwestern margin of Kunming, Yunnan, in August and September, the average temperature is about 23 ℃, rainfall is frequent, and many flowers such as petunias, canna, shrimps, peacock grass, Cleome, Dahlias, geraniums and begonias, hydrangeas, Eucalyptus even magnolia flowers, can be seen gray mold. After November, the temperature generally dropped throughout the country until February the following year, which is the year with the lowest temperature