TWO SPECIES OF <i>VALSA</i> CAUSING DISEASE IN <i>POPULUS</i>

Schreiner, E. J.

doi:10.1002/j.1537-2197.1931.tb09569.x

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…The involvement of predisposing environmental stresses in the ability of Cytospora fungi to infect hosts is not well understood. Cytospora fungi are mostly opportunistic pathogens and attack hosts that are stressed and of poor vigor (Schreiner 1931;Hinds and Stewart 1965;Schoenweiss 1967;Hinds 1985;Sinclair et al 1987;Biggs 1989;Guyon et al 1996;Mclntyre et al 1996). Helton (1961b) and Dhanvantari (1978) reported that low-temperature injury could predispose stone fruit trees to infection by Cytospora.…”

Section: Discussionmentioning

confidence: 99%

Pathogenicity of Cytospora Fungi on Six Hardwood Species

Kepley¹,

Jacobi²

2000

AUF

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Cytospora canker is a serious fungal disease of many shade, fruit, and ornamental tree species in the urban forest, orchards, and nurseries. Because Cytospora species are difficult to identify and their host ranges are poorly understood, it is not known if disease occurrence on one host poses a threat to other host species. Cytospora isolates were collected from aspen (Populus tremuloides) (Cytospora chrysosperma), green ash (Fraxinus pennsylvanica) (Cytospora pruinosa), Siberian elm (Ulmus pumila) (Cytospora sacculus), alder (Alnus spp.) (Cytospora umbrina), cottonwood (Populus spp.) (Cytospora chrysosperma), and multi- and singlestemmed willow (Salix spp.) (Cytospora fugax). These isolates were inoculated into drought-stressed aspen, green ash, Siberian elm, thinleaf alder (A. tenuifolia), eastern cottonwood (P. deltoides), and single-stemmed willow. Ash, alder, and elm isolates were host specific. Aspen and cottonwood isolates were pathogenic only on aspen and cottonwood trees. Isolates from multi-stemmed willows caused cankers on aspen only and not single-stemmed willows. However, Cytospora spp. isolates collected from a single-stemmed willow were pathogenic on trees cloned from that willow. Water potential, as a covariate, did not explain variation in canker size among trees. Thus, Cytospora fungi that are host specific may not be a threat to other nearby tree species.

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Section: Discussionmentioning

confidence: 99%

Pathogenicity of Cytospora Fungi on Six Hardwood Species

Kepley¹,

Jacobi²

2000

AUF

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“…Schreiner (1931) found a few hyphae among cells which apparently were not entirely dead, on the edge of V. sordida cankers. The wood was stained brown, and the mycelium was found in the vessels, the fibers, to some extent in the wood parenchyma, and also between the medullary ray cells; but they apparently penetrated into the medullary ray cells only when the cells were dead.…”

Section: Canker Formationmentioning

confidence: 99%

“…Inoculation experiments indicate that the fungus is a facultative wound parasite, and that the degree of parasitism is more severe during the tree's dormant period, and is usually greatest on poorly growing trees and branches (Schreiner 1931). Large trees in healthy condition may successfully callus out an infection or severely limit canker growth.…”

Section: Cytospora Cankermentioning

confidence: 99%

“…A black line of demarcation always formed when different clones of the fungus were grown in culture. Schreiner (1931) suggested that an enzyme action preceded the advance of the mycelium, and that the nature or amount of the toxic substance was specific for the individual clone.…”

Section: Canker Formationmentioning

confidence: 99%

“…Large trees in healthy condition may successfully callus out an infection or severely limit canker growth. Although the fungus often is not responsible for the injury with which it is associated, Cytospora infection is associated with frost cracks and sunscald (Hinds 1964), elk feeding wounds (Krebill 1972, Packard 1942, partially cut stands (Martin 1965), tree vigor and slash fires (Hubert 1920), drought (Riley and Hildahl 1963, Schreiner 1931, Wright 1957, and as a secondary parasite with other cankers (Hinds 1981).…”

Section: Cytospora Cankermentioning

confidence: 99%

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Aspen: Ecology and management in the western United States

DeByle¹,

Winokur²

1985

224

139

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Information about the biology, ecology, and management of quaking aspen on the mountains and plateaus of the interior western United States, and to a lesser extent, Canada, is summarized and discussed. The biology of aspen as a tree species, community relationships in the aspen ecosystem, environments, and factors affecting aspen forests are reviewed. The resources available within and from the aspen forest type, and their past and potential uses are examined. Silvicultural methods and other approaches to managing aspen for various resources and uses are presented.

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Forest-tree genetics research:Populus L.

Pauley

1949

Econ Bot

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TWO SPECIES OF VALSA CAUSING DISEASE IN POPULUS

Cited by 10 publications

References 13 publications

Pathogenicity of Cytospora Fungi on Six Hardwood Species

Pathogenicity of Cytospora Fungi on Six Hardwood Species

Aspen: Ecology and management in the western United States

Forest-tree genetics research:Populus L.

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