Abstract: Results of the laboratory tests conducted in Fuzhou in 1990 showed that a Beijing strain of Steinernema feltiae, isolated from a dead larva of Holotrichia sp. [Col.:Scarabaeidae] in 1986, had high infectivity to Zeuzera multistrigata. an important pest of Casuarina trees (Casuarina equisetifolia) in Fujian. When the leopard moth larvae were exposed to the nematode at 500 juveniles per larva in petri dishes, the larval and pupal mortalities were 100% after 5 days and 95% after 12 days, respectively. In the field experiment carried out in a Casuarina forest, the nematode was applied at 1,000 juveniles/ml with four different application methods. Two methods were found to be most effective. They were direct injection of nematode water suspension into the boring holes and inserting small pieces of synthetic foam sponge soaked with nematode water suspension into the boring holes. The larval mortality of the pest was 97% and 93%. respectively, for the two methods. The "Sponge-plug Method" was found to be easier to operate and required less water and labor compared with other methods. Applying the nematode with the "Sponge-plug Method" in a Casuarina forest of 25.3 ha in 1990 resulted in a 90% average mortality of Z. multistrigata.