Effects of Foraging Experience on Natural Population of Kerria yunnanensis (Homopterae: Kerridae) Effect of population of Kerria yunnanensis on diversity of ground-dwelling ant Seasonal Variations of Secondary Phloem Development in Pterocarya Stenoptera and Its Relation to Feeding of Kerria yunnanensis Spatiotemporal Dynamics of Nests and Population of Crematogaster macaoensis Wheeler in Mutualistic Relationship THE ANATOMY OF SECONDARY PHLOEM AND PERIDERM OF EIGHT HOST TREE SPECIES OF KERRIA YUNNANENSIS Observation on the Morphology of Kerria yunnanensis with Scanning Electron Microscope