山楂叶螨是苹果、梨、桃等果树的主要害螨,在冀中南苹果产区发生的尤为严重。在防治上,目前生产上仍沿用过去在发芽前、花前或花后和麦收前后三个时期防治的方法。有些果园还使用高浓度的有机磷农药,全年防治次数一般为3～4,多则6～7次。因此,在防治上存在着用药不当、费 Hawthorn spider mite is the main pest mite of apple, pear, peach and other fruit trees, especially in the apple producing area in south central Hebei. In the prevention and control, the current production is still used in the past in the pre-germination, pre-or post-flowering and wheat harvest before and after the three control methods. Some orchards also use high concentrations of organophosphorus pesticides, the annual number of control is generally 3 to 4, as many as 6 to 7 times. Therefore, in the prevention and control there is improper medication, fees