Residue Retention and Fungal Invasion of Chloropicrin-Treated Douglas-Fir

Chlorinated residues in amounts up to 1.5 percent of the ovendry weight of wood were present in Douglas-fir exposed to chloropicrin vapors for 240 days. These residues could not be totally removed by aeration, acetone extraction, or heating. The only volatile, fungitoxic component that could be detected in the vapor-treated wood was chemically unaltered chloropicrin. Microscopic observation of Douglas-fir wood exposed in the laboratory under severe decay conditions to Poria carbonica (a brown rot fungus) and to Ganoderma applanatum (a white-rot fungus) showed that these fungi will attack chloropicrin-treated wood, producing bore holes and erosion of cell lumen surfaces as in untreated wood. Lysis and vacuolation of the fungal hyphae, particularly of G. applanatum, indicate that the chloropicrin residue has an inhibitory effect on fungi in wood.

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