II.IPM of Stone Fruits 1.Scientific layout of orchards >Avoid planting apple,pear,peach and apricot together; Choose resistant varieties to pests; >Rational density of trees >Enough basal fertilizer.1. Scientific layout of orchards ¾ Avoid planting apple, pear, peach and apricot together; ¾ Choose resistant varieties to pests; ¾ Rational density of trees ¾ Enough basal fertilizer. Ⅱ. IPM of Stone Fruits