A combination using phosphine (PH3) and ethyl formate (EF) was performed to compensate for the disadventages (long exposure time and phytotoxicity) of a single substance. P. longisipinus was more susceptible to mixed phosphine and ethyl formate than P. orchidicola in 12 L dessicator. Mortality of mixed treatment was higher than aggregated mortalities that treated individually, so it indicated to have a synergic effect on each other. Ethyl formate was showed higher adsorption rate than phosphine on imported nursery plants and showed differences depending on the plant. P. longispinus and P. orchidicola was showed 100% mortality when phosphine and ethyl formate was treated as 1 g/m3 and 30 g/m3 for 4 hour in 0.5 m3 fumigation chamber and in 10 m3 container. Phytotoxicity was evaluated to mixture of phosphine and ethyl formate at 1 month after treatment.

• Sung Woo Cho(Department of Plant Medicine, Chungbuk National University, Korea)
• YeJin Kyung(Department of Plant Medicine, Chungbuk National University, Korea)
• Geun-Ho Park(Department of Plant Medicine, Chungbuk National University, Korea)
• Sun-Ran Cho(Department of Plant Medicine, Chungbuk National University, Korea)
• Byung-Ho Lee(Institute of Agriculture and Life Science, Gyeongsang National University)
• Jeong-Oh Yang(Plant Quarantine Technology Center, Animal and Plant Quarantine Agency)
• Hyun Kyung Kim(Department of Plant Medicine, Chungbuk National University, Korea)
• Gil-Hah Kim(Department of Plant Medicine, Chungbuk National University, Korea)