研究植病流行分别研究各种因素对流行的作用,从定性到定量。但由于缺乏系统的观念,流行因素的罗列常不够完善,因素间相互关系的阐明不够准确,使之指导测报与防治常有似是而非之感。因此,在植病流行研究中采用系统论的观点和方法是十分必要的,也为适用系统工程方法控制病虫害流行打下基础。 Studying the prevalence of various endemic diseases on the prevalence of the disease, from qualitative to quantitative. However, due to the lack of systematic concept, the list of prevailing factors is not perfect enough, and the clarification of the interrelationship among factors is not accurate enough to make it a common sense to report and control the newspaper. Therefore, it is very necessary to adopt the systematic viewpoints and methods in the research of plant disease epidemiology, and lay the foundation for the application of systematic engineering methods to control the epidemic of pests and diseases.