Effects of selective cutting on the epidemiology of armillaria root disease in the southern interior of British Columbia

Morrison, D. J.; Pellow, K. W.; Nemec, A.; Norris, Dorothy; Semenoff, P.

doi:10.1139/x00-144

Cited by 52 publications

(63 citation statements)

References 12 publications

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“…Armillaria ostoyae is capable of penetrating intact healthy root bark ( Thomas 1934; Solla et al. 2002) and all commercial species of conifers in British Columbia are susceptible to infection ( Morrison et al. 1991).…”

Section: Introductionmentioning

confidence: 99%

Necrophylactic periderm formation in the roots of western larch and Douglas‐fir trees infected with Armillaria ostoyae. II. The response to the pathogen

2004

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Summary Periderm formation was studied in bark samples collected from the roots of western larch (Larix occidentalis) and Douglas‐fir (Pseudotsuga menziesii) trees infected with Armillaria ostoyae. Necrophylactic periderms were formed in advance of infection and successfully restricted continued fungal spread in 68 and 45% of the samples collected from 10‐ and 27‐year‐old western larch, respectively. However, all periderms formed in 11‐ and 25‐year‐old Douglas‐fir had been breached by the advancing fungus. In both species, necrophylactic periderms were commonly breached at the junction of the periderm with the vascular cambium. In western larch, stone phellem often comprised the external phellem layer of necrophylactic periderms with multiple bands of phellem. In 27‐year‐old western larch, infection was often confined to discrete lesions bounded by multiple periderms with multiple bands of phellem. In both tree species, phellem production was greater in response to infection than in response to abiotic wounding.

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Section: Introductionmentioning

confidence: 99%

Necrophylactic periderm formation in the roots of western larch and Douglas‐fir trees infected with Armillaria ostoyae. II. The response to the pathogen

2004

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“…These are known activities that can promote the spread and infection of trees by wood-rotting basidiomycetes (Morrison et al 2001). These are known activities that can promote the spread and infection of trees by wood-rotting basidiomycetes (Morrison et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Wood‐rotting basidiomycetes associated with declining native trees in timber‐harvesting compartments of the Garden Route National Park of South Africa

et al. 2017

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Trees in the Garden Route National Park (GRNP) indigenous forests in South Africa are selectively harvested for timber based on criteria that include signs and symptoms induced by wood-rotting fungi. However, virtually nothing is known regarding the identity and host associations of these macro-fungi in this natural ecosystem. Surveys were conducted in three harvesting compartments in the GRNP to investigate the taxonomic affiliation and species richness of these fungi on standing and recently harvested trees. Samples were collected from basidiomes on infected trees and tree stumps, and from diseased tissues on symptomatic trees. Phylogenetic analyses using ITS sequences characterized the isolates obtained into 26 Operational Taxonomic Units (OTUs) belonging to 17 genera after clustering the sequences at a 97% identity threshold. Ganoderma (Ganodermataceae) and Inonotus (Hymenochaetaceae) were the most species-rich genera and the Bloukrans compartment, with 22 OTUs, showed the highest species richness. A fungus (OTU1) affiliated with Ganoderma pfeifferi was the most abundant in the surveyed areas. Its predominance was also evidenced on host trees since it occurred on 15 of the 20 tree species sampled, with Olea capensis subsp. macrocarpa (Oleaceae) being the most colonized host. Given the wide variety of wood-rotting basidiomycetes revealed by this study and particularly the preponderance of species with pathogenic potential, more attention should be given to better understand their ecological role in this natural ecosystem as well as the effects of logging that may enhance their dissemination or negatively affect their diversity and the health of trees in the region. Fig. 2. Symptoms and signs observed on sampled trees in the GRNP: (a) sap exudation and basal stem rot, (b) bracket-like basidiomes of a Ganoderma species, (c) white mycelial mat under the bark of tree with basal stem rot. [Colour figure can be viewed at wileyonlinelibrary.com]

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“…Tree mortality because of A. ostoyae is known to occur in natural forests and plantations throughout Europe and North America ( Kile et al. 1991; Morrison et al. 1991a).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the virulence of Armillaria cepistipes and Armillaria ostoyae on four Norway spruce provenances

Prospero

Holdenrieder²,

Rigling

2004

Forest Pathology

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Summary The basidiomycetes Armillaria cepistipes and Armillaria ostoyae frequently occur in the same forest stand. In this study, we determined the virulence of 20 isolates of A. cepistipes and 16 isolates of A. ostoyae on four different provenances of 2‐year‐old Norway spruce (Picea abies). Within 30 months after inoculation, 1.1 and 19.1% of the seedlings inoculated with A. cepistipes and A. ostoyae, respectively, had died or were dying. The incidence of dead and dying seedlings varied between 3 and 49% among the A. ostoyae isolates. The virulence of an isolate was positively correlated to its ability to produce rhizomorphs. One Norway spruce provenance showed significantly lower susceptibility to A. ostoyae than the other three. Rhizomorphs of both Armillaria species were attached to the root surface. The attached rhizomorphs of A. ostoyae, however, were associated with significantly more lesions. The virulence of the isolates was not correlated with their wood‐degrading capability for either of the Armillaria species.

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Effects of selective cutting on the epidemiology of armillaria root disease in the southern interior of British Columbia

Cited by 52 publications

References 12 publications

Necrophylactic periderm formation in the roots of western larch and Douglas‐fir trees infected with Armillaria ostoyae. II. The response to the pathogen

Necrophylactic periderm formation in the roots of western larch and Douglas‐fir trees infected with Armillaria ostoyae. II. The response to the pathogen

Wood‐rotting basidiomycetes associated with declining native trees in timber‐harvesting compartments of the Garden Route National Park of South Africa

Comparison of the virulence of Armillaria cepistipes and Armillaria ostoyae on four Norway spruce provenances

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