Factors Influencing The Movement of Chloropicrin Vapor In Wood To Control Decay

P. A. Cooper, R. D. Graham, R. T. Lin


Some of the factors affecting the movement of chloropicrin vapor in wood to control decay were studied in a series of four experiments. Chloropicrin moved much faster in permeable Douglas-fir heartwood than in wood of low permeability, partly because of more extensive liquid movement in the permeable woods. The lethal dosage of chloropicrin to the wood decay fungus Poria monticola was from 20 to 100 mg-h/liter for the conditions evaluated. Chloropicrin movement in a decaying Douglas-fir pole section was variable and was facilitated by the decayed area. Most areas in the pole received a high dosage of vapor, more than sufficient to kill decay fungi. Vapor could still be detected at most of the sampling sites six months after treatment. The release of chloropicrin vapor in wood could be controlled by dissolving paradichlorobenzene in the chemical to lower its vapor pressure and by confining chloropicrin in polymer slow-release capsules. These approaches increased the duration of the vapor in wood.


Chloropicrin;Poria monticola;Pseudotsuga menziesii;Thuja plicata;diffusion;air permeability;fungal toxicity;sterilants;<i>in situ</i> treatments

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