为了提高经济效益增加农民收入,号召广大农民进行反季节栽培蔬菜,即日光温室或塑料大棚蔬菜栽培,但是,在冬季生产过程中经常遇到连阴天天气,由于棚内湿度大,蔬菜极易产生各种病害,因此,不得不用药剂进行化学方法防治。通过儿年来的生产实践,连阴天蔬菜喷药很容易产生药害,为了安全用药,避免不必要的药害所产生的损失应注意以下几点。一、看天气喷药 In order to increase economic efficiency and increase peasants’ incomes, it is called for peasants to carry out cultivation of vegetables in counter-season cultivation, that is, solar greenhouse or plastic greenhouse vegetable cultivation. However, cloudy weather is often encountered in the winter production process. Produce a variety of diseases, therefore, had to use chemical agents for chemical control. Through the years of production practice, even the cloudy vegetable spray is easy to produce phytotoxicity, in order to safely medication, to avoid unnecessary injury caused by the loss should pay attention to the following points. First, see the weather spray