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Ecological Characteristics of Shivaphis pteroceltis (Hemiptera: Aphididae), A New Pest on Pteroceltis tatarinowii A STUDY ON PHYSOKERMES SHANXIENSIS TANG (HOMOPTERA: COCCOIDEA: COCCIDAE) THE ECOLOGICAL EFFECT OF NWE PESTICIDE MONOCARBOXOLDEHYDE IN PLANT-SOIL SYSTEM