分析了南充市小麦条锈病、水稻稻瘟病、稻飞虱和油菜菌核病的发生流行规律,病虫发生相关性,找出了影响重大病虫重发的决定因子,评价了主要病虫发生危害情况、灾变规律和风险。 The prevalence of wheat stripe rust, rice blast, planthopper and sclerotinia sclerotiorum in Nanchong City was analyzed, and the correlation between pests and diseases was analyzed. The determinants of the recurrence of major pests and diseases were identified and the main pest occurrences were evaluated Hazard, catastrophes and risks.