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刮皮是综合防治果树害虫的有效措施。冬前或春初进行刮皮,可将处于越冬休眠状态的害虫,从集中潜伏的场所刮除,从而大大压低越冬基数,为全年防治打下基础。但在刮皮时,必须注意保护天敌。据调查果树害虫的天敌大部分集中在三主枝以下树干上越冬,占全树越冬量的83.5％,其中捕食红蜘蛛的重要天敌如小黑瓢虫和小黑花蝽高达85.8％和90.2％,三主枝以上干部和剪锯口只占15.8％和0.7万。而害虫则
Skin scraping is an effective measure to prevent fruit pests. Pre-winter or early spring scraping the skin, pests can be in winter dormancy, from the concentrated place of potential curettage, which greatly reduce the base of winter, lay the foundation for the prevention and treatment of the year. However, when scraping the skin, care must be taken to protect the natural enemies. According to the survey, most of the natural enemies of fruit pests concentrated in the trunk below the three main branches of the winter, accounting for 83.5% of the tree overwintering, of which predators spider mite, such as black ladybugs and black snaffletius as high as 85.8% and 90.2% Three cadres and more than 15.8% of cadres and scissors saws and 7,000. The pests are