This study describes the movement and persistence of four fumigants in sawn red and white oak timbers exposed out of ground contact for 2 years. Chloropicrin moved the furthest from the point of application, and was the most persistent. Vapam was next best, followed by Dazomet. Methylisothiocyanate (MIT), applied as pellets, was not effective, probably because MIT was lost from pellets prior to treatment. The fumigants did not move as far or persist as long in white oak as in red oak. Wrapping the timbers prior to treatment enhanced the distance chloropicrin and Vapam moved in both red and white oak. However, in white oak, persistence of the fumigants was rather poor in both wrapped and unwrapped timbers.

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