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Notes: Movement of Chloropicrin or Methylisothiocyanate through the Boles of Douglas-Fir Trees

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Movement of the wood fumigants chloropicrin and methylisothiocyanate (MITC) through living Douglas-fir trees was evaluated at selected heights above treatment holes 18 and 42 months after treatment. Wood-sample extracts were analyzed by gas chromatography. After 18 months, concentrations of MITC were 10 to 30 times higher than those of chloropicrin. Concentrations of both chemicals were higher in heartwood than in the wetter sapwood. After 42 months, concentrations of both chemicals were much higher and apparent at greater distances from the point of application. MITC concentrations were again higher than those of chloropicrin, which has a lower water solubility that may limit diffusion. Both chemicals moved through Douglas-fir heartwood as far as 4 m from the application point over the 42 months. For. Sci. (36):192-195.
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Keywords: Laminated root rot; Phellinus weirii; chloropicrin; fumigant; methylisothiocyanate

Document Type: Miscellaneous

Affiliations: Research Assistant, Department of Forest Products, College of Forestry, Oregon State University, Corvallis, Oregon 97331

Publication date: 01 March 1990

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