The fumigation activity of phosphine (PH3) to T. castaneum as a storage grain pest was evaluated. The lethal concentration time (LCT) value of each developmental stage (egg, early larva, late larva, pupa and adult) of T. castaneum was analyzed in 12 L desiccator. At the T. castaneum larva stages, exposure for 4 h showed low LCT value, especially in early stage larvae (LCT99 = 0.32 mg·h/L) which is very high susceptibility to PH3. However, T. castaneum eggs were observed very high tolerance to PH3 at LCT99 77.47 mg·h/L. Therefore, the fumigant activity of PH3 against T. castaneum can be found to be significantly different depending on developmental stage.

• Geun Ho Jeong(Department of Plant Medicine, Chungbuk National University)
• Sung Woo Cho(Department of Plant Medicine, Chungbuk National University)
• Hyun-Na Koo(Department of Plant Medicine, Chungbuk National University)
• Hyun Kyung Kim(Department of Plant Medicine, Chungbuk National University)
• Bongsu Kim(Department of Plant Medicine, Chungbuk National University/Animal and Plant Quarantine and Inspection Agency (APQA))
• Jeongoh Yang(Animal and Plant Quarantine and Inspection Agency (APQA))
• Gil-Hah Kim(Department of Plant Medicine, Chungbuk National University)