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Title:	*Abundance of Armillaria* within old-growth eastern hemlock stands in South-Central Pennsylvania**
Author(s):	Fromm, Matthew S.; Davis, Donald D.
Date:	2007
Source:	e-Gen. Tech. Rep. SRS–101. U.S. Department of Agriculture, Forest Service, Southern Research Station: 169-175 [CD-ROM].
Description:	Abstract—In early summer 2002, 329 soil-sampling pits were dug within an old-growth, eastern hemlock (Tsuga canadensis [L.] Carrière) stand in south-central Pennsylvania recently infested with the hemlock woolly adelgid (Adelges tsugae Annand). For comparison, 199 similar pits were dug in an adjacent hardwood stand. Rhizomorphs of Armillaria (Fr: Fr) Staude were recovered from 8.5 percent of the sample pits in the old-growth hemlock stand, and from 6.0 percent of the pits within the hardwood stand. Average lengths of rhizomorphs per sample pit were 1.8 and 1.6 cm within the hemlock and hardwood stand, respectively. For only pits that contained rhizomorphs, the average length of rhizomorphs per sample pit was 21.5, and 26.6 cm within the hemlock and hardwood stand, respectively. Based on IGS-1 rDNA sequence data, recovered Armillaria were either A. ostoya or within the A. gallica/calvescens/sinapina group. There were no readily apparent differences n Armillaria between the two stands.
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