苹果、梨烂根病及防治烂根病的诱发因素可分侵染性因素和非侵染性因素，前者有根腐病、白绢病、紫纹羽、根朽病，后者主要指水涝、盐害、冻害、施肥不当等。两类因素往往同时存在或互为诱因，所以要注意全面分析，对症治疗。一般土壤粘重、栽植过深、低洼积水的果园较易发... Apple, pear root rot and control of rotten root disease inducing factors can be divided into invasive factors and non-invasive factors, the former root rot, Sclerotium, purple lines feather, root rot, the latter mainly refers to water Waterlogging, salt damage, frost damage, improper fertilization and so on. Two types of factors often exist at the same time or each other incentives, it is necessary to pay attention to a comprehensive analysis of symptomatic treatment. General soil sticky, planting too deep, low-lying water orchard prone to hair ...