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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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Bernard Jabas 1 and Dr. You may be, however, able to change your browser cytospkra to cause your browser to refuse cookies in general, block third party cookies or to indicate when a cookie is being sent.

This opportunistic fungus often inhabits apparently healthy bark and buds and is thus in cytospkra to infect weakened tissue quickly and massively.

For practical reasons we have decided not to translate all pages in several languages anymore because it was too heavy to maintain but some of the labels of the basic and advanced query pages are still available. Inoculation of eight 1-year-old seedlings of white poplar and willow Salix acmophylla Boiss proved the pathogenicity of several isolates of C. The bark dried out and separated from the underlying wood.

IPM : Reports on Plant Diseases : Cytospora Canker of Poplars and Willows

The inner bark turns black and sometimes gives off a foul salty odor. No cankers developed on the control seedlings.

This can be challenging since pathogens can remain dormant or have endophytic stages in the host tissues. Obligate or homotypic synonyms: The colorless, one-celled ascospores Figure 4d may also be forcibly expelled into the air when the stromata in dry bark become saturated with water.

Discrete cankers first appear on young trees as brown, slightly sunken areas in the smooth bark of branches and trunks Figure 3, left. Exposure to daylight induced pycnidial development after 3 to 4 weeks. Cookies are small text files that contain a string of characters and uniquely identifies a browser. Valsa sordida Nitschke, Pyrenomycetes Germanici 2: We use cookies in a very limited number of scenarios that are all present to help the users to have an easier experience.


Using Cytospoga Analytics, we can see what content is popular on our websites. This will help to protect your privacy. It attacks several hardwoods, notably trees used for bioenergy such as cottonwood, trembling aspen, and willows. Careers In Plant Pathology. The fungus spreads by producing conidia asexual spores within fruiting bodies pycnidia on the cankers.

Twigs commonly die without the formation of typical lesions. 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. Under moist conditions, spore masses oozed out in long, reddish brown, coiled tendrils. Google Wikimedia Wikipedia Wikispecies. The lesions enlarge during the winter, becoming dark brown to black and water-soaked with distinct margins.

Seedborne fungi, insect damage, adverse weather such as frostimproper storage, and physiological aging all reduce seed vigor and viability. Seedlots with 20 to 40 percent of the seeds decayed by Phomopsis spp. Cytospora chrysosperma and its perfect state Valsa sordida is generally considered to be a saprophyte or weak parasite living on dead bark.

When the stromata are wet for a prolonged period the asci Figure 4ceach containing chrysospera ascospores, may exude from the perithecium much cytosproa the release of conidia.

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

Cytospora chrysosperma left as it would be seen under a high-power microscope. In disease affects already weakened or stressed trees, and the fungus usually gains entry through a wound on the branches or trunk. Decayed seeds are elongated, shriveled, discolored, and often covered with white mold growth Figure 3.


A herbarium specimen was deposited at the U. You can prevent the information generated by the Google cookie about your use of our Sites from being cytosporz and processed by Google in cygospora future by downloading and installing Google Analytics Opt-out Browser Add-on for your current web browser.

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

Cankers usually develop in the fall, winter, and early 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 or 20 to 30 C. Specimen record 4.

Plant Disease Management Reports. Contact Us – Report a Bad Link. The fungus kills areas of bark on branches and trunks creating circular to oval or elongate sunken lesions cankers Figures 2 and 3.

Cytospora canker

Encyclopedia of Life EOL. Pairwise sequence alignments Polyphasic identifications. It is replaced each time there is a query done. Reisolations from inoculated plants yielded C. The pathogen invades the stems, branches, and twigs of the host trees and forms cankers. As the cankers enlarge the diseased outer bark may become black, brown, gray, reddish brown or yellow and sunken depending on the host species and stage of disease development.

Outbreak prevention depends largely on a better understanding of how pathogens infect trees so that resistance can be developed and on early detection, spread of the disease can be reduced through monitoring and surveillance. Sanctioned by Sanctioning name Validated by Type specimen or ex type More specimens Human pathogenicity code Plant pathogenicity code Code toxicity. Open the calendar popup. Bark susceptibility may be induced by heating to approximately F 40 C which is not uncommon on hot summer days.

Severely infected trees usually die branch by branch often producing sprouts at the base of the trunk which also become infected and die.