Abstract: With pentachlorophenol sodium and pure water as controls, the soaking liquids of the fresh roots, stem barks, and leaves of Pterocarya stenoptera were used to examine their killing effect on Oncomelania hupensis. The result shows that the soaking liquid at>5% concentrations could kill 20～100% bodies of Oncomelania hupensis. When treated for 240h., the mortality of O.hupensis was up to 93.5～100%. The soaking liquid of 2.5% fresh leaves of P.stenoptera mixed with 2.5% leaves of Sapium sebiferum, Taxodium ascendens or Cinnamomum camphora, or with the whole boby of Rumex japonicus or Artemisia apiacea, killed 96.7%, 93.3%, 80%, 100%, 86.7% bodies of O.hupensis, respectively, when O.hupensis was treated for 240h.

Key words: Pterocarya stenoptera, Soaking liquid of fresh Pterocarya stenoptera, Oncomelania hupensis, Killing effect