冬季冻害可造成冬春季节小麦死苗死蘖。冬季冻害是小麦进入冬季以后,到越冬期间由于寒潮降温引起的冻害。根据小麦受冻后的植株症状可分为严重冻害和一般冻害两大类。严重冻害是主茎和大分蘖死亡、心叶干枯,一般发生在已拔节的麦田,这类冻害会影响小麦产量。一般冻害症状表现为叶片黄白干枯,但主茎和大分蘖没有冻死,基本上不会 Winter frost damage can cause winter and spring dead wheat dead tiller. Winter frost damage is the frost damage caused by cold spell after winter wheat enters winter period. According to the plant symptoms of wheat after freezing can be divided into two major categories of severe frost damage and general frost damage. Severe frost damage is the death of the main stem and tillering, heart leaf dry, usually occurs in the jointed wheat fields, such frost damage will affect the wheat yield. The general symptoms of frost damage leaves yellowish-white dry, but the main stems and big tillers are not frozen to death, basically do not