山楂叶螨是苹果、梨、桃等果树的主要害螨。其为害方式主要是吸吮叶片及枝条绿色部分的汁液,破坏叶绿素,影响光合作用。果树严重被害后造成早期大量落叶,甚至当年长二次叶开二次花,影响果树的生长发育和降低产量。影响山楂叶螨种群密度的因 Hawthorn spider mite is apple, pear, peach and other fruit trees the main pest mites. The damage is mainly sucking the green leaves and branches of the juice, destroy chlorophyll, affecting photosynthesis. Fruit trees were severely victimized after a large number of early deciduous leaves, even when the secondary leaves of the second year of secondary flowers, affecting the growth and development of fruit trees and reduce production. Factors influencing population density of hawthorn spider mite population