1危害状梨木虱以成虫与若虫吸食梨芽、叶片及嫩梢的汁液,以若虫危害为主。叶片受害后出现褐色枯斑,严重时全叶变褐再变黑,并造成早期落叶。若虫能分泌大量黏液,导致煤污病。新梢被害后发育不良。果实受害后果面呈烟污状,影响梨果的外观质量,并影响果实的生长发育。梨木虱危害后使树势衰弱,减少当 1 Harmful pear psyllids to adults and nymphs to attract pear buds, leaves and young shoots of the juice, mainly to nymphs. Brownish blotches appear after the leaves are damaged, browning and then blackening of the whole leaves in severe cases, and causing early deciduous leaves. Nymphs can secrete large amounts of mucus, leading to coal pollution. Shoot damage after the development of new shoots. The consequences of fruit damage were smoky, affecting the appearance of pear quality, and affect the fruit growth and development. Pest damage after the fall of the pomegranate tree, reducing when