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病虫的发生期、发生量和危害程度的变化,同周围的物理环境(温度、雨量、土壤等)和生物环境(天敌、食物等)密切相关.病、虫预测预报中的一个重要方面,就是研究病、虫消长的内在和外在规律及其和其他事物之间的联系,并抓住其本质的联系,通过测量外界环境因素的变化程度,估测病、虫发生期,发生量或危害程度.分析研究变化因素间是否有关系,称为相关;分析研究
The occurrence and occurrence of pest and disease, the occurrence and the degree of damage are closely related to the surrounding physical environment (temperature, rainfall, soil, etc.) and the biological environment (natural enemies, food, etc.) An important aspect of the prediction and forecast of diseases and insects, Is to study the internal and external laws of the disease, the growth and decline of insects and their relationship with other things, and grasp its essential relationship. By measuring the degree of change of external environmental factors, the disease, the occurrence period of the insects, the occurrence or Degree of harm.Analysis of whether there is a relationship between the changing factors, known as the correlation; analysis and research