由于杏树开花早 ,而此时北方天气尚冷 ,随时都会有晚霜发生 ,造成春季杏树满树花 ,而到收获时却所剩无几。防治方法 :1.浇水　萌芽前浇 1次水 ,可降低地温 ,推迟杏树开花 ,一般可延迟 3～ 5天。2 .熏烟　当天气预报有晚霜时 ,按每亩等距放 6个碎草堆儿。当观察到清晨温度达 0℃ As apricot flowering early, but the weather is still cold in the north at any time there will be a night cream, resulting in spring apricot trees, but to harvest when little left. Control methods: 1. Watering a water before sprouting, can reduce the ground temperature, delayed apricot blossom, the general delay of 3 to 5 days. 2. Fumigation When the weather forecast has a night frost, put 6 broken grass heaps per mu equidistantly. When it was observed early morning temperature of 0 ℃