Visible versus actual incidence of Armillaria root disease in juvenile coniferous stands in the southern interior of British Columbia

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

doi:10.1139/cjfr-30-3-405

Cited by 32 publications

(43 citation statements)

References 25 publications

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“…Incidence of A. ostoyae on individual Douglas-fir was recorded where they were either dead or symptomatic (i.e., with chlorotic or red foliage; stunted or sparse foliage; basal resinosis on the bark surface; A. ostoyae fruiting bodies on or near the sapling stem; or creamy-white mycelial fans in the bark of the lower stem (Morrison et al, 1991)). Although aboveground symptoms underestimate belowground infection rates (Morrison et al, 2000), we could not excavate root systems to quantify this because it would compromise the long-term viability of the experiment.…”

Section: Douglas-fir Responsementioning

confidence: 99%

Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia

Baleshta

Simard

Guy

et al. 2005

Forest Ecology and Management

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Section: Douglas-fir Responsementioning

confidence: 99%

Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia

Baleshta

Simard

Guy

et al. 2005

Forest Ecology and Management

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“…It is also an important commercial species for production of pulpwood and construction-grade lumber. However, in nurseries and plantations, white spruce is sensitive to multiple fungal diseases (23,29,42,62,76). Climate change scenarios suggest that diseases could result in increased mortality in conifer forests (22,48).…”

mentioning

confidence: 99%

Impact of Endochitinase-Transformed White Spruce on Soil Fungal Biomass and Ectendomycorrhizal Symbiosis

Stefani

Tanguay

Pelletier

et al. 2010

Appl Environ Microbiol

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The impact of transgenic white spruce [Picea glauca (Moench) Voss] containing the endochitinase gene (ech42) on soil fungal biomass and on the ectendomycorrhizal fungi Wilcoxina spp. was tested using a greenhouse trial. The measured level of endochitinase in roots of transgenic white spruce was up to 10 times higher than that in roots of nontransformed white spruce. The level of endochitinase in root exudates of three of four ech42-transformed lines was significantly greater than that in controls. Analysis soil ergosterol showed that the amount of fungal biomass in soil samples from control white spruce was slightly larger than that in soil samples from ech42-transformed white spruce. Nevertheless, the difference was not statistically significant. The rates of mycorrhizal colonization of transformed lines and controls were similar. Sequencing the internal transcribed spacer rRNA region revealed that the root tips were colonized by the ectendomycorrhizal fungi Wilcoxina spp. and the dark septate endophyte Phialocephala fortinii. Colonization of root tips by Wilcoxina spp. was monitored by real-time PCR to quantify the fungus present during the development of ectendomycorrhizal symbiosis in ech42-transformed and control lines. The numbers of Wilcoxina molecules in the transformed lines and the controls were not significantly different (P > 0.05, as determined by analysis of covariance), indicating that in spite of higher levels of endochitinase expression, mycorrhization was not inhibited. Our results indicate that the higher levels of chitinolytic activity in root exudates and root tissues from ech42-transformed lines did not alter the soil fungal biomass or the development of ectendomycorrhizal symbiosis involving Wilcoxina spp.

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“…Fourthly, only mortality, and not infection, was measured in this experiment. In with below ground symptoms displayed above ground symptoms, depending on climatic region (Morrison et al 2000). It is possible that there could have been an increase of infection on the crop trees that was not expressed above ground because the trees were able to hold the infections in check.…”

Section: Discussionmentioning

confidence: 99%

Post-spacing mortality of lodgepole pine from armillaria root disease

Blenis¹

2000

The Forestry Chronicle

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To evaluate the threat of annillaria root disease in precommercially thinned lodgepole pine (Pinus contorta var. latifolia), a total of 66 15 x 15-m plots were established in dense lodgepole pine regeneration, 18 to 21 years after harvest, on three infested sites near Hinton, Alberta. Three treatments (2.5-m spacing, 1.5-m spacing and an unspaced control) were randomly applied to plots having similar densities and levels of mortality. After 11 years there was no significant difference among the treatments in cumulative percent mortality. Based on observed levels of mortality, it would appear that spacing need not be avoided in infested stands, although it likely would be prudent to space more closely than 2.5 m in younger stands and in parts of stands having more than 5-10% mortality.Key words: precommercial thinning, spacing, armillaria root disease, Amzillaria ostoyae Afin d'6valuer la menace de carie des racines dans les peuplements de pin lodgepole (Pinus contorta var. latifolia) ayant subi une Cclaircie pr6-commerciale, 66 parcelles de 15 x 15 m ont kt6 mises en place dans un couvert dense de rCgCn6ration de pin lodgepole, 18 B 21 ans aprirs la rkcolte, sur trois sites infest6s situCs prks de Hinton en Alberta. Trois traitements (un espacement de 2.5 m, de 1.5 m et un tkmoin sans espacement) ont 6t6 appliqu6s au hasard dans les parcelle ayant des densit6s et des taux de mortalit6 semblables. Aprks 11 ans, on estime qu'il n'y a pas de diff6rence significative entre les traitements au niveau du pourcentage cumulatif de mortalit& Selon les niveaux de mortalit6 observCs, il semblerait que l'espacement pourrait ne pas 6tre 6vit6 dans les peuplements infestks, m6me s'il semblerait prudent d'effectuer un espacement de moins de 2.5 m dans les peuplements plus jeunes et dans les parties de peuplements atteignant plus de 5 B 10 pour-cent de mortalit6.

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Visible versus actual incidence of Armillaria root disease in juvenile coniferous stands in the southern interior of British Columbia

Cited by 32 publications

References 25 publications

Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia

Reducing paper birch density increases Douglas-fir growth rate and Armillaria root disease incidence in southern interior British Columbia

Impact of Endochitinase-Transformed White Spruce on Soil Fungal Biomass and Ectendomycorrhizal Symbiosis

Post-spacing mortality of lodgepole pine from armillaria root disease

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