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冬季气候变化较大,易形成灾害。遭遇冰雪冻灾后,农作物生长受损,抵抗力下降,加上冰冻造成的直接伤害,易受病害侵染。并且灾害天气过后湿度较大,如气温回升较快,则利于多种疫病的发生和加重。而果树受冻修剪后会萌发大量枝梢嫩叶,易造成煤烟病、炭疽病、疮痂病、叶斑病、蚜虫、粉虱、螨类等病虫害的发生、流行。具体防治措施(一)叶菜类蔬菜1.做好育苗地的防寒保暖工作
Winter climate changes, easy to form a disaster. After suffering from freezing snow and ice, crop growth is impaired, resistance is reduced, coupled with direct injury caused by freezing, susceptible to disease infection. And the humidity after the disaster weather is bigger, if the temperature picks up fast, it is good for the occurrence and aggravation of many kinds of epidemics. The fruit trees after freezing pruning will germinate a large number of shoots young leaves, easily lead to sooty tobacco, anthracnose, scab disease, leaf spot, aphids, whitefly, mites and other pests and diseases, the epidemic. Specific prevention and control measures (a) leafy vegetables 1 well nursery to cold warm work