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Disease Control and Pest Management

Efficacy of Various Fumigants in the Eradication of Decay Fungi Implanted in Douglas-fir Timbers. Wallace E. Eslyn, Supervisory research plant pathologist, Forest Products Laboratory, USDA Forest Service, Madison, WI 53705; Terry L. Highley, research plant pathologist, Forest Products Laboratory, USDA Forest Service, Madison, WI 53705. Phytopathology 75:588-592. Accepted for publication 10 December 1984. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1985. DOI: 10.1094/Phyto-75-588.

Vapam proved to be the most effective of 12 fumigants in killing test tube cultures of Poria placenta, P. carbonica, P. xantha, Fibroporia vaillantii, Lentinus lepideus, Antrodia serialis, Serpula incrassata, and Gloeophyllum trabeum implanted in Douglas-fir timbers. Of 11 other fumigants tested, Busan 40, Mylone, and sodium bisulfite were the next most effective. Fumigant toxicity was generally greatest during the first 4 mo following treatment. Vapam continued to be effective up to 16 mo at 0.61 m from the base of fumigation, after which its lethality dropped markedly. The variation in fumigant efficacy between timbers could be attributed to checking in the timbers. Differences in fungal sensitivity to the fumigants were observed.