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近年来随着果树栽培面积的不断扩大．果树的各类病害也逐年升高．其中梨树黄化病在伊盟伊金霍洛旗发生最为严重。病树树势衰弱．产量大减．严重的造成枯枝或死亡。这种病害不仅发生在1～3年生小树上．也发生在初果、盛果和多年结果的老树上。其原因有以下两点：1．该地区土壤理
In recent years, with the growing area of fruit trees. Various diseases of fruit trees are also increasing year by year. Among them, pear-tree disease occurs most frequently in the Iraqi Union Ejin Horo flag. The diseased tree is weak. Significant reduction in output. Severe litter or death. This disease occurs not only in 1 to 3 years old trees. Also occurred in the early fruit, fruit and years of fruit trees. The reason is the following two points: 1. Soil science in the area