一、发生概况 叶螨是果树生产上的主要害虫之一。特别是近两年来,我市黄河沿岸、忻定盆地猖獗发生,一些防治不及时的果树,3～5日内就使树叶变红,进而引起叶片失绿、枯焦、脱落,群众称之为“火烧”,直接影响到苹果、梨、海红、山楂等果树的正常生长和果品产量、质量的提高。 果树叶螨在我市主要有山楂红蜘蛛、苜蓿红蜘蛛,以山楂红蜘蛛为优势 First, the occurrence of Spider mite is one of the major pests on the production of fruit trees. Especially in the past two years, the Yellow River in our city, Xinding basin rampant, some control fruit trees in time, 3 to 5 days make the leaves turn red, and then cause the leaves green, Kujiao, off, the masses called “fire ”Directly affects the normal growth of fruit trees such as apple, pear, sea red and hawthorn and the improvement of fruit yield and quality. Fruit tree spider mites in the city mainly hawthorns red spider, alfalfa spider mite, hawthorn spider mite advantage