Methyl Bromide Treatment of Oak Wilt Infected Logs: Laboratory and Preliminary Field Fumigations

Concern over accidental introduction of the oak wilt fungus (Ceratocystis fagacearum) into oak-importing nations has prompted a study supported by the U.S. National Lumber Exporters Association to assess the efficacy of methyl bromide fumigation to eradicate the fungus from logs. Laboratory and field fumigation trials intended to aid in the development of a reliable and realistic treatment were performed on red and white oaks at the University of Minnesota in 1980. Introduction of pure methyl bromide at a rate of 240 g/m3 of space under a polyethylene cover kept in place for 3 days eradicated the fungus from short log sections at temperatures down to 5?C in laboratory chamber fumigations. Outdoor trials using small stacks of 2.4-m logs with intact bark reduced the fungus isolation frequency to a fractional percentage of untreated controls but reducing the duration of fumigation to 2 days was not as effective.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member