Bioconcentration effects of Cd, Pb and Zn in soil-Eupatorium adenophorum Spreng-Procecidochares utilis Stone system Effects of parasitizing on the sexual reproduction of Eupatorium adenophorum Sprengel by Procecidochares utilis Stone at different microhabitats PARASITISM OF PROCECIDOCHARES UTILIS AND ITS EFFECT ON GROWTH AND REPRODUCTION OF EUPATORIUM ADENOPHORUM