Cytospora Canker Cytospora chrysosperma (Pers.:Fr.) Fr. PDF file. Hosts: Aspen, cottonwood, alder and other riparian species. Figure An expanding. Cytospora chrysosperma (Pers.:Fr.) Fr. is a fungus that causes a tree disease called Cytospora canker. It attacks several hardwoods, notably trees used for. Cytospora canker of poplars–including aspens and cottonwoods–and willows is caused by the fungus Cytospora chrysosperma (perfect or teleomorph state.

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Exposure to daylight induced pycnidial development after 3 to 4 weeks. Later, copious, dark pycnidia developed on the dead bark. Common Names of Plant Diseases. Specimen record 4. We can observe a zone chryeosperma dead bark, sunken and brown around the entry point, generally a wound or a dead twig. Lombardy poplar trees being killed by Cytospora canker.

Cytospora chrysosperma

Cytospora cankers on a Simon poplar in a nursery. The cytodpora infection is followed by the death of part of the bark and rarely by the formation of a true canker. Highly susceptible trees, such as Lombardy poplars Figure 1may die within 2 to 5 years after becoming infected. University of Illinois Extension provides equal opportunities in programs and employment. Cytospira rough or excessive handling of dry or moist seeds at harvest or planting can cause cracked seedcoats and kill seed embryos.

Sanctioned by Sanctioning name Validated by Type specimen or ex type More specimens Human pathogenicity code Plant pathogenicity code Code toxicity. Cankers usually develop in the fall, winter, and cbrysosperma spring and enlarge slowly at low temperatures 36 to 50 F or 2 to 10 C and up to 40 millimeters per day at higher temperatures 68 to 86 F chryslsperma 20 to 30 C. Left, canker on a dwarf arctic willow stem following transplant shock courtesy Dr.


Bark susceptibility may be induced by heating to approximately F 40 C which is not uncommon on hot summer days. Cytosoora view of four perithecial stromata erupting through the bark; B, section through a stroma showing four perithecia with the tips of their necks protruding from the stroma; C, an ascus with 8 ascospores; D, two ascospores. We use cookies in a very limited number of scenarios that are all present to help the cytospoga to have an easier experience.

Note the sunken girdling cankers on the branches and trunk and the flow of gum oozing from the dead tissues Illinois Natural History Survey photo. This pathogen can cause serious damage in forest nurseries, young plantations, and in horticultural settings. The fungus grows through the bark cells and the outer few rings of wood.

The affected branches turned yellowish brown, and the inner bark turned black.

Valsa sordida Nitschke, Pyrenomycetes Germanici 2: Feedback on this page. To our knowledge, this is the first report of Cytospora canker on white poplar in Israel. The perithecia are black, spherical, and several are arranged in a ring in the lower, outer part of the cytospkra.

The inner bark turns black and sometimes gives off a foul salty odor. Contains Matches exactly Value is undefined. Orange fruiting bodies and occasionally orange tendrils conidia protruding through the bark can also be seen. Under the bark, the wood is discoloured, wet and foul-smelling. The lesions enlarge during the winter, becoming dark brown to black and water-soaked with chrysospwrma margins.


Cytospora canker of willow.

Apples, choke cherryeastern cottonwoodelders, European white poplar, maple, mountain-ash, Norway maple, oaks, silver maplesugar maplewater birchwhite birch. Severely infected trees usually die branch by branch often producing sprouts at the base of the trunk which also become infected and die. Discrete cankers first appear on young trees as brown, slightly sunken areas in the smooth bark of branches and trunks Figure 3, left.

Other fungal links Bibliography links General links Molecular links Specimens and strains links. Current name Classification Type name Basionym Obligate or homotypic chrysosprrma Anamorph synonyms Teleomorph synonyms Facultative or heterotypic synonyms Type of organism. This Add-on is available at http: Description Micro-habitat s Trunk, Annual shoot, Branch Distribution Eastern Canada Damage, symptoms and biology We can observe a zone of dead bark, sunken and brown around the entry point, generally a wound or a dead twig.

Infection usually occurs through bark wounds typically resulting from mechanical damage. Cytospora chrysosperma CFL v1.

Cytospora canker

Specimen record 3. Cytospora canker Cytospora canker on aspen, caused by Valsa sordida. Cytospora canker Spore tendrils on willow, characteristic of one type of fruiting of Valsa sordidathe causal agent of Cytospora canker.

The pycnidia are much more abundant than the perithecia. Since pathogens of cytopsora and pines tend to track their hosts worldwide better detection and surveillance are essential. Google Wikimedia Wikipedia Wikispecies. Perithecia of the sexual stage Valsa are rare and appear under the bark.