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入冬以后,由于寒流、冰冻、低温天气多,易造成小麦冻害。据多年观察受凉小麦,受害程度主茎重于分蘗,低位分蘖重于高位分蘗。受害小麦一般减产10～30%,重者达50%。受冻害的小麦植株脉尖端发白,无心叶,形成空心,一层层剖开叶鞘,从下往上数第二节嫩茎折迭,柔软无光,似水烫一般。如果第二节不再伸长,则说明主茎生长点已停止生长,黄化后死亡。
After winter, due to cold, freezing, cold weather, easy to cause wheat frost damage. According to years of observation of cold wheat, the degree of damage to the main stem heavier tillers, tillers tillers heavier than the high tiller. Victims of wheat generally cut 10 to 30%, severe cases up to 50%. Frostbite of wheat plant tip white, no heart leaves, the formation of hollow, cut open the leaf sheath layer by layer, from the bottom of the second section of stems fold, soft and dull, like hot water in general. If the second section is no longer elongation, then the growth point of the main stem has stopped growing, died after yellowing.