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众所周知,自去年冬小麦播种以来,我国北方大部降水较少,对小麦越冬带来不利影响。特别是暖冬,使越冬害虫基数较大。虽然在今年2月末,上述地区普遍出现一次较大的降雪使旱情暂时得以缓解,但就目前来看,从上次降水以来,已过去1个多月的时间,上述地区再没有发生有效降水,旱情再次出现严峻形势。随着气温的日渐回升和这种干旱少雨的持续,导致当前小麦病虫害较往年同期偏重发生,主要以麦蜘蛛、麦蚜、小麦条锈病、白粉病为主。这正如全国农业技术推广服务
As we all know, since the sowing of winter wheat last year, most of the precipitation in northern China has less adverse impact on winter wheat. Especially warm winter, so that pests more base. Although at the end of February this year, a relatively large amount of snowfall had generally eased the drought in the above areas, for now, more than a month has passed since the last rainfall and no effective precipitation has occurred in the above areas. The drought again appeared a grim situation. With the gradual recovery of the temperature and the prolonged dry weather, the current wheat pests and diseases are more prevalent than the same period of previous years. The main diseases are wheat spiders, wheat aphids, wheat stripe rust and powdery mildew. This is just like the national agricultural extension service