Concern over accidental introduction of the oak wilt fungus (Ceratocystis fagacearum) into oak-importing nations has prompted a study supported by the US National Lumber Exporters Association to assess the efficacy of methyl bromide fumigation to eradicate the fungus from logs. Introduction of pure methyl bromide at a rate of 240 g/m₃ of space under a polyethylene cover, kept in place for three days, eradicated the fungus from short log sections of red and white oak at temperatures down to 5°C in laboratory chamber fumigations. Outdoor trials using small stacks of 2.4-meter logs with intact bark reduced the fungus isolation frequency to a small percentage of untreated controls. Reducing the duration of fumigation to two days was not as effective. -- AATA