Fumigants can stop internal decay of Douglas-Fir poles for at least 5 years
Graham, R.D.; Scheffer, T.C.; Helsing, G.; Lew, J.D.
Forest Products Journal 26(7): 38-41
(Cf. preceding abstract) Describes field studies to test the effectiveness of chloropicrin, Vapam and Vorlex in stopping internal decay in Douglas Fir transmission poles previously pressure-treated with pentachlorophenol in heavy oil. Two pints of the fumigants were placed in 7 holes within 3 feet of the ground line of each pole in 1969, and changes in the fungal population were measured annually.