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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Attacks by pathogens represent one of the most important threats to the sustainable growth of bioenergy trees in plantations.

First Report of Cytospora Canker Caused by Cytospora chrysosperma on White Poplar in Israel

Other fungal links Bibliography links General links Molecular cchrysosperma Specimens and strains links. Cytospora canker Spore tendrils of C. The affected branches turned yellowish brown, and the inner bark turned black. Cytospora canker of willow.

The bark dried out and separated from the underlying wood. Cookies are small text files that contain a string of characters and uniquely identifies a browser. This pathogen can cause serious damage in forest nurseries, young plantations, and in horticultural settings. Plant Disease Management Reports. Symptoms of blackstem occur in the fall as small lesions at the ends of cuttings or at leaf scars and lenticels, usually on stems but occasionally on the roots.

Cytospora chrysosperma

Seedborne fungi, insect damage, adverse weather such as frostimproper storage, and physiological aging all reduce seed vigor and viability. Severely infected trees usually die branch chrysisperma branch often producing sprouts at the base of the trunk which also become infected and die.


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The fungus spreads by producing conidia asexual spores within fruiting bodies pycnidia on the cankers. Matches exactly Value is undefined.

Feedback on this page. Encyclopedia of Life EOL. Infection usually occurs through bark wounds typically resulting from mechanical damage. Using Google Analytics, chrjsosperma can see what content is popular on our websites.

Seed decay is most severe when the crop has matured under high rainfall and humidity and when harvest has been delayed by wet weather.

This disease is rarely a problem of economic importance in natural stands, but can cause serious damage in forest nurseries, young plantations, and in horticultural settings.

You can prevent the information generated by the Google cookie about your use of our Sites from being collected and processed by Google in the future by downloading and installing Google Analytics Opt-out Browser Add-on for your current web browser. Specimen record 3. The pycnidia are much more abundant than the perithecia. 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.

Note the fruiting bodies of the Cytospora fungus which appear as pustules in the diseased bark.

The spores were hyaline, one-celled, and slightly curved, 1. The information is depersonalized and is displayed as chryosperma, meaning it cannot be traced back to individuals. By sequencing and comparing the genomes of the most important pathogens of poplars and pines, we plan to create a database that will be used to develop tools for the detection, monitoring, surveillance and rapid response of pathogens in these economically and ecologically important trees.


Schoeneweiss ; right, cankers on an older weeping willow 9courtesy Dr. Any rough or excessive handling of dry or moist seeds at harvest or planting can cause cracked seedcoats and kill seed embryos.

Some hybrid poplars are much more resistant than indigenous species. This Add-on is available at http: The presence of this disease generally indicates that the trees are under stress.

Decayed seeds are elongated, shriveled, discolored, and often covered with white mold growth Figure 3. You may be, however, able to change your browser settings to cause your browser to refuse cookies in general, block third party cookies or to indicate when a cookie is being sent.

Cytospora canker

Discrete cankers first appear on young trees as brown, slightly sunken areas in the smooth bark of branches and trunks Figure 3, left. Specimen record 6. Drawing by Lenore Gray. Frequently, as the chryzosperma gradually enlarges, affected stems are girdled and killed. The disease causes greater damage in young trees. 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. Your feedback is very important to us.