Effects of Methyl Iodide on Mortality of Forest Insect Pests

摘要

Each stage of nine species of forest insect pests (Callidiellum rufipenne, Monochamus alternatus, Semanotus japonicus, Cryphalus fulvus, Ips cembrae, Xyleborus pfeili, Xylosandrus germanus, Pissodes nitidus and Shirahoshizo rufescens) were fumigated with methyl iodide (MI) at 5, 10, 15, 30 and 50 g/m~3 for 24 hours at 15°C with approximately 25% loading. Egg stages of five species of the pests were killed completely at 5 - 10 g/m~3 of MI, while larval and pupal stages of all species of the pests under bark and in xylem and artificial diet were also killed completely at 30 g/m~3 except for C. rufipenne, M. alternatus and S. rufescens. A 100% mortality of all stages of the pests except for C. rufipenne larvae in xylem were obtained at 50 g/m~3. MI would be a high potential fumigant for imported logs infested with various species of forest insect pests.