A SIMULATION OF INTERSPECIFIC RELATIONSHIP BETWEEN WOOLLY APPLE APHID, ERIOSO- MA LANIGERUM (HAUS.) AND ITS PARASITE, APHELINUS MALI (HALD.)Ⅱ. A SIMULATION AND SENSITIVE ANALYSIS OF NATURAL SYSTEM OF HOST-PARASITE A SIMULATION OF INTERSPECIFIC RELATIONSHIP BETWEEN WOOLLY APPLE APHID ERIOSOMA LANIGERUM (HAUS.) AND ITS PARASITE APHEL1NUS MALI (HALD.) 1 . THE COMPARATIVE STUDY OF BIOLOGY AND ECOLOGY OF WOOLLY APPLE APHID AND ITS PARASITE Natural control of Aphelinus malion Eriosoma lanigerumand the parasitoid’s overwintering protection measures 鲁西南地区苹果绵蚜(Eriosoma lanigerum)及其天敌种群动态与群落结构特征