玉米植株的病害较多,其中属于传染性的是由真菌、细菌,病毒等微生物引起,一般都有典型的症状,根据症状和病原微生物的鉴定,即可获得正确的诊断。另一类属于生理性病害,主要由不良的气候与土壤条件和缺乏某种营养元素造成,有的还由于化学药物和过量肥料的伤害。生理性病害的症状往往不甚典型,而又无病原微生物作为鉴定依据,但只要仔细观察植株在一定生育期中症状的出现和演变,充分了解当时当地的气候、土壤和管理等情况,并考虑和某些传染性病害的区别,多数 Maize plant diseases are more, which are contagious is caused by fungi, bacteria, viruses and other microorganisms, usually have typical symptoms, according to the identification of symptoms and pathogenic microorganisms, you can get the correct diagnosis. The other is a physiological disease, mainly caused by poor climate and soil conditions and the lack of certain nutrients, some also due to chemical drugs and excessive fertilizer damage. Physiological disease symptoms are often not typical, but no pathogenic microorganisms as a basis for identification, but as long as the careful observation of plants in a certain period of the emergence and evolution of symptoms, fully understand the local climate, soil and management, etc., and consider and The difference between some infectious diseases, most