II.IPM of Stone Fruits 3.Control in early spring Key pests:scale insects;red spider mites Control methods:spray 0.3-0.5 Baume degree(波美度)of calcium polysulphides(石 硫合剂3. Control in early spring ‰ Key pests: scale insects; red spider mites. ‰ Control methods: spray 0.3-0.5 Baumé degree (波美度) of calcium polysulphides ( 石 硫合剂). Ⅱ. IPM of Stone Fruits