Publication Date:
1984-10-01
Description:
The heartwood in each of eight decay-free Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) trees was injected with 125, 250, or 500 mL of the agricultural fumigant chloropicrin (nitrotrichloromethane). The trees were periodically inspected during 4 years to determine the extent of the phytotoxic response. Diffusion of fungistatic vapors within the heartwood and sapwood of the trees was monitored by closed-tube bioassay of increment cores. During the 1st year, all trees reacted adversely to the treatment, especially those of least diameter. Reaction was less severe in trees treated with smaller doses of fumigant. After 4 years, no continued, adverse response to treatment was apparent, and growth of all trees remained comparable to that of control trees. Fungistatic vapors were detected in the heartwood of the treated trees at some sites 1 and 2 m from the treatment zone. Additional experimentation using trees infected with decay is suggested.
Print ISSN:
0045-5067
Electronic ISSN:
1208-6037
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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