Effect of Temperature on Growth and Survival of Fomes annosus
The effect of temperature on growth rate and inactivation of Fomes annosus (Fr.) Karst. was determined in freshly cut stem sections of Pinus taeda L. Stem sections 5 to 6 cm in diameter from 5- to 6-year-old trees were washed with 65 percent ethanol, inoculated on one end with conidia, and incubated in plastic chambers. Growth rate from 5° to 35° C was similar to that obtained on malt-extract agar. For the isolate used, growth rate at 25° C was 0.9 cm per day and at 30° C was 0.6 cm per day. Actively growing mycelium in wood chips was killed in less than 2 hours at 40° C. Preliminary data indicated that stump surface temperatures reached 40° C or higher for periods of at least 2 hours on more than 50 percent of the days from May to August. These data provide one explanation of why less stump colonization by F. annosus occurs in parts of the southeastern United States during the summer than during other seasons.
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Document Type: Journal Article
Affiliations: Plant Pathologists, Southeastern Forest Expt. Sta., Forest Service, USDA, Athens, Ga.
Publication date: 1966-09-01
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