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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When the stromata are wet for a prolonged period the asci Figure 4ceach containing 8 ascospores, may exude from the perithecium much like the release of conidia. This will help to protect your privacy. Topical Meetings and Workshops. Vertical cracks within the lesion and along the canker margins often occur in the bark Figures 2 and 3, right. The pathogen invades the stems, branches, and twigs of the host trees and forms cankers.

Contact our curators Dr. Specimens and strains links: This is used when first reloading the page. Seed decay is most severe when the crop has matured under high rainfall and humidity and when harvest has been delayed by wet weather. The pycnidia are much more abundant than the perithecia.

Cytospora canker

The bark dried out and separated from the underlying wood. The disease causes greater damage in young trees. Cytospora canker Spore tendrils on willow, characteristic of one type of fruiting of Valsa sordidathe causal agent of Cytospora canker. In humid weather, the spores of the fungus are released from the bark in the form of orange tendrils and are spread by rain, wind or animals.


Shortly after the bark dies two types of black, pinhead-sized, spore-producing bodies form in stromata in the outer diseased bark Figure 2 and 3 ; the pycnidia of the asexual phase Cytospora chrysosperma i and the perithecia of the sexual state Valsa sordida Figure 4.

A new disease, causing death of mature white poplar trees Populus alba L. Valsa sordida Nitschke, Pyrenomycetes Germanici 2: We can also see orange-coloured fructifications and sometimes orange-coloured tendrils conidia coming out of the bark.

Matches exactly Value is undefined. Cookies are small text files that contain a string of characters and uniquely identifies a cytodpora. We use cookies in a very limited number of scenarios that are cytosplra present to help the users to have an easier experience. If you would like to know more about cookies and how they work, please visit www.

No other cookies than the ones mentioned above are used on our websites. Cytospora cankers on a Simon poplar in a nursery. The initial infection is followed by the death of part of the bark and rarely by the formation of a true canker. Many factors affect seed quality.

Mushroom Observer: Name: Cytospora chrysosperma (Pers.) Fr.

Other fungal links Bibliography links General links Molecular links Specimens and strains links. Catalogue of Life CoL.

These cankers are circular to oval or irregular in shape. Isolations made from affected branches yielded colonies of Cytospora chrysosperma Pers.: Specimen record 2.

Register new name species, genus, family, etc Register new type specimen of existing taxa epitype, neotype, etc. Lombardy poplar trees being killed by Cytospora canker. After the infection is initiated, part of the bark dies and a true crysosperma may form in rare cases Other information The disease causes greater damage in young trees.

Cytospora canker Spore tendrils of C. Contains Matches exactly Value is undefined. As the cankers enlarge the diseased outer bark may become black, brown, gray, reddish brown or yellow and sunken depending on cytosoora host species and stage of disease development.

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Bark susceptibility may be induced by heating to approximately F 40 C which is not uncommon on hot summer days. The presence of this disease generally indicates that the trees are under stress. Specimen record 6. The fungus grows through the bark cells and the outer few rings of wood.

Current name Classification Type name Basionym Obligate or homotypic synonyms Anamorph synonyms Teleomorph synonyms Facultative or heterotypic synonyms Type of organism. The disease is usually associated with trees growing outside their normal range or under unfavorable conditions due to a poor site, frost damage, periods of drought, extremely cold winter weather, transplant shock, or severe pruning pollarding. A, Section through a pycnidial stroma showing two chambers and a pore releasing spores conidia from the right chamber; B, section of the pycnidial wall showing conidiophores bearing conidia at their tips; C, six colorless, one-celled conidia.

Common Names of Plant Diseases.

The yellowish to reddish brown spore horns consist of masses of one-celled spores conidia in a gelatinous matrix. Plant Disease Management Reports. Cytospora chrysosperma CFL v1. chryxosperma

The fungus kills areas of bark on branches and trunks creating circular to oval or elongate sunken lesions cankers Figures 2 and 3. No cankers developed on the control seedlings.