Combinations of Fungal Antagonists for Biological Control of<i>Armillaria</i>Root Rot of Strawberry Plants

Raziq, Fazli; Fox, R.T.V.

doi:10.1080/01448765.2005.9755307

Cited by 18 publications

(10 citation statements)

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“…However, trees colonized by both A. altimontana and A. solidipes displayed a reduced growth and survival similar to trees colonized by only A. solidipes (Table 4), which suggests that once A. solidipes has colonized the cambial tissue of living roots, it may have a competitive advantage over A. altimontana as a pathogen on substrates within a living host. Understanding the biotic (e.g., [65][66][67][68][69][70][71][72][73][74][75][76]) and abiotic (e.g., [5]) environmental factors that influence the dynamic interactions of A. altimontana and A. solidipes seems key to the development of management practices for Armillaria root disease in coniferous forests of the interior western North America.…”

Section: Discussionmentioning

confidence: 99%

Armillaria altimontana Is Associated with Healthy Western White Pine (Pinus monticola): Potential in Situ Biological Control of the Armillaria Root Disease Pathogen, A. solidipes

Warwell

McDonald

Hanna

et al. 2019

Forests

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Research Highlights: Two genets of Armillaria altimontana Brazee, B. Ortiz, Banik, and D.L. Lindner and five genets of Armillaria solidipes Peck (as A. ostoyae [Romagnesi] Herink) were identified and spatially mapped within a 16-year-old western white pine (Pinus monticola Doug.) plantation, which demonstrated distinct spatial distribution and interspecific associations. Background and Objectives: A. solidipes and A. altimontana frequently co-occur within inland western regions of the contiguous USA. While A. solidipes is well-known as a virulent primary pathogen that causes root disease on diverse conifers, little has been documented on the impact of A. altimontana or its interaction with A. solidipes on growth, survival, and the Armillaria root disease of conifers. Materials and Methods: In 1971, a provenance planting of P. monticola spanning 0.8 ha was established at the Priest River Experimental Forest in northern Idaho, USA. In 1987, 2076 living or recently dead trees were measured and surveyed for Armillaria spp. to describe the demography and to assess the potential influences of Armillaria spp. on growth, survival, and the Armillaria root disease among the study trees. Results: Among the study trees, 54.9% were associated with Armillaria spp. The genets of A. altimontana and A. solidipes comprised 82.7% and 17.3% of the sampled isolates (n = 1221) from the study plot, respectively. The mapped distributions showed a wide, often noncontiguous, spatial span of individual Armillaria genets. Furthermore, A. solidipes was found to be uncommon in areas dominated by A. altimontana. The trees colonized by A. solidipes were associated with a lower tree growth/survival and a substantially higher incidence of root disease than trees colonized only by A. altimontana or trees with no colonization by Armillaria spp. Conclusions: The results demonstrate that A. altimontana was not harmful to P. monticola within the northern Idaho planting. In addition, the on-site, species-distribution patterns suggest that A. altimontana acts as a long-term, in situ biological control of A. solidipes. The interactions between these two Armillaria species appear critical to understanding the Armillaria root disease in this region.

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Section: Discussionmentioning

confidence: 99%

Armillaria altimontana Is Associated with Healthy Western White Pine (Pinus monticola): Potential in Situ Biological Control of the Armillaria Root Disease Pathogen, A. solidipes

Warwell

McDonald

Hanna

et al. 2019

Forests

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“…The identification of mycoparasites that are ‘superpathogens’ of Armillaria would advance the development of biological control for Armillaria root disease. The soil‐borne fungus Trichoderma has already been shown to be an effective parasite of Armillaria (Raziq and Fox, 2005). Antagonistic strains of rhizosphere bacteria are also a promising area of research (Baumgartner and Warnock, 2006; Perazzolli et al ., 2007), especially given the ease of their application through drip‐irrigation systems.…”

Section: Future Prospects: Resistant Plant Materialsmentioning

confidence: 99%

Secrets of the subterranean pathosystem of Armillaria

Baumgartner

Coetzee

Hoffmeister

2011

Molecular Plant Pathology

168

174

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Armillaria root disease affects fruit and nut crops, timber trees and ornamentals in boreal, temperate and tropical regions of the world. The causal pathogens are members of the genus Armillaria (Basidiomycota, Physalacriaceae). This review summarizes the state of knowledge and highlights recent advances in Armillaria research. Taxonomy:Armillaria includes more than 40 morphological species. However, the identification and delineation of species on the basis of morphological characters are problematic, resulting in many species being undetected. Implementation of the biological species' concept and DNA sequence comparisons in the contemporary taxonomy of Armillaria have led to the discovery of a number of new species that are not linked to described morphological species.Host range: Armillaria exhibits a range of symbioses with both plants and fungi. As plant pathogens, Armillaria species have broad host ranges, infecting mostly woody species. Armillaria can also colonize orchids Galeola and Gastrodia but, in this case, the fungus is the host and the plant is the parasite. Similar to its contrasting relationships with plants, Armillaria acts as either host or parasite in its interactions with other fungi.Disease control: Recent research on post-infection controls has revealed promising alternatives to the former pre-plant eradication attempts with soil fumigants, which are now being regulated more heavily or banned outright because of their negative effects on the environment. New study tools for genetic manipulation of the pathogen and characterization of the molecular basis of the host response will greatly advance the development of resistant rootstocks in a new stage of research. The depth of the research, regardless of whether traditional or genomic approaches are used, will depend on a clear understanding of where the different propagules of Armillaria attack a root system, which of the pathogen's diverse biolymer-degrading enzymes and secondary metabolites facilitate infection, and how the course of infection differs between resistant and susceptible hosts.

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“…Armillaria is thought to serve as the mycobiont in a complex symbiotic relationship in which the Armillaria mycelium is consumed by the orchid (Kusano, 1911). All other reports of herbaceous infection describe a typical, pathogenic symbiosis on herbaceous hosts from the field (Thomas, 1934;Raabe, 1958;Shaw III et al, 1976;Gregory, 1985;Klein-Gebbinck et al, 1991;Mwenje et al, 1998;Raziq & Fox, 2005). It is important to note that herbaceous hosts infected with Armillaria in the field, including our findings on daylily, are always proximal to woody substrate (Klein-Gebbinck et al, 1991), suggesting that woody hosts serve as the source of inoculum.…”

Section: Discussionmentioning

confidence: 66%

Natural infection of an herbaceous host byArmillaria: a case study onHemerocallis^†

Blaedow

Baumgartner

Cox

et al. 2010

Canadian Journal of Plant Pathology

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Symptoms of Armillaria root rot were observed on the herbaceous ornamental, Hemerocallis sp. (daylily), in a residential area in Walhalla, South Carolina, which was surrounded by dense, hardwood forest that also contained diseased hosts. Our objectives were to describe a natural occurrence of Armillaria root rot on daylily, a newly discovered host for the pathogen, and to characterize the Armillaria species involved. To characterize the Armillaria species collected from daylily, we used all available methods, including both traditional (sexual compatibility tests, basidiome morphology) and molecular (phylogenetic analyses of rDNA internal transcribed spacer, ITS, and intergenic spacer I, IGS-I) approaches. The presence of rhizomorphs in the topsoil of daylily beds and on the roots of symptomatic daylilies, coupled with our finding of identical ITS1 sequences among isolates originating from each of a rhizomorph, a daylily, and a neighbouring dogwood, suggests that Armillaria rhizomorphs had spread from native hosts to infect the daylilies. Basidiocarp morphology and basidiospore size best matched that documented for A. gallica. However, rDNA sequence analysis and sexual compatibility were not 100% conclusive. Phylogenetic analysis of ITS sequences revealed that the unknown Armillaria isolates were most closely related to A. calvescens and A. gallica. Analysis of IGS-I sequences was even less informative, grouping our isolates with A. cepistipes, A. gallica and A. sinapina. Sexual compatibility (mating) tests revealed that haploid isolates from daylily were compatible with three of the A. gallica tester isolates, but also one of the A. calvescens tester isolates. Our findings suggest a possible southerly distribution and expanded host range for A. gallica, and raise further questions about the Armillaria species concept as it pertains to the two closely related species, A. calvescens and A. gallica. Résumé:Les symptômes du pourridié-agaric ont été observés sur la plante herbacée ornementale Hemerocallis sp. (belle-d'un-jour) dans un quartier résidentiel de Walhalla, en Caroline du Sud, qui était entouré par une forêt dense de feuillus qui comportait également des arbres infectés. Nos objectifs étaient de décrire une occurrence naturelle du pourridié-agaric sur la belle-d'un-jour, un hôte récemment découvert, et de caractériser l'espèce d'Armillaria impliquée dans le processus. Afin de caractériser l'espèce d'Armillaria collectée sur la belle-d'un-jour, nous avons utilisé toutes les méthodes disponibles, y compris les méthodes traditionnelles (les tests de compatibilité sexuelle, la morphologie du basidiome) et moléculaires [les analyses phylogéniques de l'espaceur transcrit interne de l'ADNr (ITS) et de l'espaceur intergénique I (IGS-I)]. La présence de rhizomorphes dans le sol des massifs de belles-d'un-jour et sur les racines des plants affichant les symptômes, associée à notre découverte de séquences ITS1 identiques dans les isolats provenant d'un rhizomorphe, d'une belle-d'un-jour et d'un cornouiller voisin, su...

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Combinations of Fungal Antagonists for Biological Control ofArmillariaRoot Rot of Strawberry Plants

Cited by 18 publications

References 19 publications

Armillaria altimontana Is Associated with Healthy Western White Pine (Pinus monticola): Potential in Situ Biological Control of the Armillaria Root Disease Pathogen, A. solidipes

Armillaria altimontana Is Associated with Healthy Western White Pine (Pinus monticola): Potential in Situ Biological Control of the Armillaria Root Disease Pathogen, A. solidipes

Secrets of the subterranean pathosystem of Armillaria

Natural infection of an herbaceous host byArmillaria: a case study onHemerocallis^†

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Combinations of Fungal Antagonists for Biological Control ofArmillariaRoot Rot of Strawberry Plants

Cited by 18 publications

References 19 publications

Armillaria altimontana Is Associated with Healthy Western White Pine (Pinus monticola): Potential in Situ Biological Control of the Armillaria Root Disease Pathogen, A. solidipes

Armillaria altimontana Is Associated with Healthy Western White Pine (Pinus monticola): Potential in Situ Biological Control of the Armillaria Root Disease Pathogen, A. solidipes

Secrets of the subterranean pathosystem of Armillaria

Natural infection of an herbaceous host byArmillaria: a case study onHemerocallis†

Contact Info

Product

Resources

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Natural infection of an herbaceous host byArmillaria: a case study onHemerocallis^†