山楂红蜘蛛是拉萨市郊园林上的一种主要害虫,其主要危害苹果、桃、梨、山楂等果树。该害虫在春季苹果花芽膨大期发生为害,造成花芽生长不良,花小瘦弱,甚至使花不能开放,变黄枯焦;夏季和秋季为害,常使叶片呈现黄白斑,造成早期落叶,影响果树正常发育和产量,同时秋季还可使花序分化不好,继而影响第二年开花结果.根据我们最近在拉萨市郊部分果园调查,发现山楂红蜘蛛今年在苹果树上发生较为严重。鉴 Hawthorn red spider is a major pest in the suburbs of Lhasa, the main harm to apple, peach, pear, hawthorn and other fruit trees. The pest in apple flower buds during the infancy of damage, resulting in poor growth of flower buds, flowers thin and thin, and even the flowers can not be open, yellowing and scorching; summer and autumn damage, often leaves appear yellowish white spots, causing early deciduous, affecting the normal development of fruit trees And yield, while the fall can also make poor inflorescence, which will affect the flowering results of the second year.According to our recent investigation of some orchards in the suburbs of Lhasa, hawthorn spider mite found in the apple tree more serious this year. Kam