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果树刮皮是果区群众创造的一种保护树体的有效措施。果树随着年龄的增长,树皮变得粗糙。老而粗糙的树皮失去弹性和伸展性,不适应树干木质部加粗的生长而挤压导管,因而削弱生长,使树体早衰。刮树皮则可以减少老皮压力,更新重长。更重要的是,有许多害虫的卵、蛹、幼虫、成虫和病菌孢子,潜藏在粗糙的树皮、翘皮或枯老树皮缝里休眠越冬,不吃也不活动。通过刮树皮可以消灭在老皮裂缝中越冬的害虫、虫卵和病菌,是消灭病虫的有力措施。树皮缝里越冬的害虫有梨小食心虫、梨蝽象、梨黄粉虫、康氏粉蚧、梨星毛虫、梨木虱,苹果小食心虫、山楂红蜘蛛、卷叶蛾类、旋纹潜叶蛾、桃蚜、柿毛毡蚧壳虫、柿蒂虫、枣粉蚧壳虫、枣粘虫、栗大蚜虫等20多种。根据河北省果树研究所调查,仔细
Fruit tree skin scraping is a kind of effective measures to protect the tree created by the people in the area. The tree bark gets rough with age. The old and rough bark loses its elasticity and extensibility and does not adapt to the thick growth of the trunk xylem and squeezes the catheter, thus weakening the growth and premature aging of the tree. Bark scraping can reduce the pressure of the old skin, update the heavy length. More importantly, there are many pests of eggs, pupae, larvae, adults and spores of bacteria hiding in the rough bark, bark or dead bark cracks in the dormant overwintering, do not eat or not active. By scraping the bark you can eliminate the overwintering pests, eggs and germs in the cracks in the old skin, is a powerful measure to eliminate pests. Bark pests overwintering pests with pear pest insects, pear pests like, pear mealworm, Cornish mealybugs, pear caterpillars, pear psylla, apple moth worms, hawthorn red spider, leaf roll moths, curling leaf moth, peach Aphids, persimmon felt scale insects, persimmon insect persimmon, jujube powder scale insects, jujube armyworms, chestnut aphids and other 20 kinds. According to the survey of fruit trees Institute of Hebei Province, carefully