2009年11月上中旬,陕西杨凌2次突降大雪,极端最低气温达到-7.5℃,部分甜柿严重受冻,经田间调查,受冻的枝条形成层褐变,芽受冻后变黑。枝条的形成层较芽易受冻,主芽较副芽易受冻。品种受冻程度以西村早生受冻最重,其次为伊豆、前川次郎和大秋,而夕红、富有、骏河、花御所、晚御所等无论是枝条或芽均未发现有受冻的现象。以上结果说明,在甜柿进入休眠期以前,-7.5℃的低温可导致其发生严重冻害。 In mid-November 2009, Yangling, Shaanxi, twice dived and suffered heavy snowfall. The extreme minimum temperature reached -7.5 ℃. Some persimmon fruits were severely frozen. After field investigation, the frozen branches became brown and the buds became black after they were frozen. The formation of shoots than the bud susceptible to freezing, the main buds than the deputy buds vulnerable to freezing. The degree of frostbite was the highest in Xishui village, followed by Izu, Maejangjiro and Daqiu, and the phenomenon of frostbite was not found in either branches or buds in evening red, rich, Suruga, . The above results show that, before the persimmon into dormancy period, low temperature of -7.5 ℃ can cause serious frost damage.