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Abstract
Species in the white-rot fungal genus
Armillaria vary in parasitic aggressiveness as root and butt rot pathogens of trees.
Armillaria genets (individuals) were mapped in the Throughfall Displacement Experiment (TDE) using mushrooms and rhizomorphs collected in 1994 and 1995. Initiated in July 1993, the TDE consists of three 80 x 80 m plots. The "ambient" plot receives natural precipitation; the "wet" plot also receives 33% of throughfall from the "dry" plot (which also had lower pre-treatment mean soil water content). Isolates from 36 rhizomorph and 48 mushroom collections of
A. gallica Marxmuller & Romagnesi, and from 21 mushroom collections of
A. mellea (Vaht:Fr.) Kummer, represent 5
A. gallica genets and 18
A. mellea genets. Only 3 of the 84
A. gallica collections, and 1 of the 21
A. mellea collections, were obtained from the dry plot. The two largest
A. gallica genets occupy most of the wet and ambient plots, overlapping very little. Most of the
A. mellea genets are represented by single collections throughout the wet and ambient plots. At least nine
A. mellea genets occur within the boundaries of the two largest
A. gallica genets.
Armillaria species interactions with each other, with forest community vegetation, and with the TDE treatments are hypothesized.
Citation
Bruhn, Johann N.; Brenneman, James A.; Wetteroff, James J., Jr.; Mihail, Jeanne D.; Leininger, Theodor D. 1997. Spatial patterns of
Armillaria populations in the walker branch watershed throughfall displacement experiment, Tennessee,USA. In: Pallardy, Stephen G.; Cecich, Robert A.; Garrett, H. Gene; Johnson, Paul S., eds. Proceedings of the 11th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-188. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station: 49-57
