The Influence Of Wood Moisture Content On The Fungitoxicity Of Methylisothiocyanate In Douglas-Fir Heartwood
Keywords:Methylisothiocyanate, moisture content
AbstractHigh concentrations of the fumigant methylisothiocyanate (MITC) will effectively control decay fungi in large wood structures, but the fungitoxicity of low MITC concentrations and the influence of wood moisture content (MC) on its performance are not well understood. The MC of Douglas-fir heartwood greatly influenced the susceptibility of the decay fungus Poria carbonica to MITC vapors and the amount of MITC adsorbed by the wood. At constant, low MITC vapor concentrations (less than 1μg/cc air), wood at 10% MC adsorbed 5 times more MITC, but required 4 times the exposure period to control P. carbonica, than wood above the fiber saturation point. Adsorption of MITC to wood was not substantially influenced by the amount of wood decay. When wood MC was raised from 10% to 30% during fumigation, previously adsorbed MITC rapidly volatilized and fumigant fungitoxicity increased.
Goodell, B. S., R. D. Graham, and R. L. Krahmer. 1980. Chloropicrin movement and fungitoxicity in a decaying southern pine laminated timber. For. Prod. J. 30(7):39-43.nGraham, R. D. 1973. Preventing and stopping internal decay of Douglas-fir poles. Holzforschung 27:168-173.nHelsing, G. G., J. Morrell, and R. D. Graham. 1984. Evaluation of fumigants for control of internal decay in pressure-treated Douglas-fir poles and piles. Holzforschung 38:277-280.nMorrell, J. J., and M. E. Corden. 1986. Conserving energy by safe and environmentally acceptable practices in maintaining and procuring transmission poles for long service. Sixth Annual Report. Cooperative Pole Research Program. Oregon State University, Corvallis, OR.nZabel, R. A., C. J. K. Wang, and F. C. Terracina. 1982. The fungal associates, detection, and fumigant control of decay in treated southern pine poles. Electric Power Research Institute, Project 1471-1, Final Report, El-2768. SUNY College of Environmental Science and Forestry, Syracuse, NY.nZahora, A. R., and M, E. Corden. 1985a. Gelatin encapsulation of methylisothiocyanate for control of wood-decay fungi. For. Prod. J. 35(7):64-69.nZahora, A. R., and M, E. Corden., 1985b. Methylisothiocyanate fungitoxicity to Poria carbonica in Douglas-fir heartwood. Mater. Org. 20:193-204.n
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