煤污病为害果树叶片、枝杆和果实表面 ,并形成果色煤污 ,严重影响果树的光合作用和水果外观形象。该病在我国北方温带水果主产区较少发生 ,因此研究较少 ,但在西南、华南等地则较普遍 ,主要为害水稻、烤烟、园林观赏植物和水果。我省以芒果发病最多、最重 ,其次苹果、梨、桃、 Coal stains damage fruit tree leaves, branches and fruit surface, and the formation of fruit color coal, seriously affecting the photosynthesis of fruit trees and fruit appearance image. The disease occurs less frequently in temperate fruit producing areas in the northern part of China. Therefore, the study is rare, but it is more common in the southwest and southern China, mainly affecting rice, flue-cured tobacco, ornamental plants and fruits. The most incidence of mango in our province, the heaviest, followed by apple, pear, peach,