Abstract
Genetic similarity among Armillaria genets responsible for root disease foci in a northern Michigan red pine plantation was investigated. The study plantation was established in 1984 in a clear-cut portion of a 60-yr-old hardwood forest. Armillaria isolates obtained from 87 moribund seedlings were examined. All 87 isolates were identified as A. ostoyae on the basis of mitochondrial DNA (mtDNA) restriction fragment patterns and/or mating interactions with voucher isolates. Independent assays of nuclear DNA restriction fragment patterns and somatic incompatibility groups agreed completely in distinguishing genets at the study site. Given knowledge of the stand history and previous estimates of mycelial growth rates, we conclude that several genets occupying large territories must have been established long before the 1984 stand conversion [...]
Published Version
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