Fumigation May End Oak Embargoes

Because several countries will not permit the import of oak logs and lumber from the United States unless the logs and lumber are certified by the USDA as being free of the fungus Ceratocystis fagacearum, which causes the oak wilt disease, exports are limited. This is an attempt to devise a treatment that is completely effective for killing the fungus prior to export. Laboratory wilt-infested oak bolts were used in experiment, and control methods were also employed. The process involved covering the bolts with plastic and introducing methyl bromide or chloropicrin at room temperature and atmospheric pressure for 3 days. The treatment appeared to be effective in that the fungus was not recovered from any of the treated logs.

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