STUDIES ON THE WILLOW OYSTER SCALE LEPIOSAPHES SALICINA BORCHS Relationship between the Lepidosaphes salicina-Caused Damages and Activities of Leaf Defensive Proteins of Syringa spp. Life table study on Lepidosaphes salicina Bersch Relationships between Lepidosaphes salicina Attack and Contents of Tannins and Phenolic Acids in Leaves of Different Syringa Species and Cultivars Leaves