Abstract
Proffer, T. J., Jones, A. L., and Ehret, G. R. 1987. Biological species of Armillaria isolated from sour cherry orchards in Michigan. Phytopathology 77:941-943. In Michigan, Armillaria root rot severely affects Montmorency sour intersterility groups were compatible with North American intersterility cherry trees growing in sandy soils. Haploid, single basidiospore cultures groups I, III, and VI of Armillaria as designated by Anderson and Ullrich. were established from basidiocarps of Armillaria collected from 56 sour From the 72 orchard trees sampled, groups I, III, and VI were collected cherry, two sweet cherry, four peach, one apple, and five oak trees. A total from 58, 3, and I 1 trees, respectively. Group VI was also collected from five of 77 trees from 20 orchards and from one nonorchard site were sampled. oaks at one location. North American group I, which corresponds with the Where basidiocarps or viable basidiospores were absent, haploid isolates taxonomic species A. ostoyae, was widely distributed in Michigan were recovered from diploid isolates by inducing somatic segregation. orchards. Group VI, A. mellea sensu stricto, and group III were restricted Based on the sexual compatibility of paired isolates, three intersterile in their distribution. All three biological species should be considered groups of Armillaria were identified among the collected isolates. These pathogens of orchard crops. Additional key word: Prunus cerasus.
Published Version
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