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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The perithecia are black, spherical, and several are arranged in a ring in the lower, outer part of the stroma. Valsa sordida Nitschke, Pyrenomycetes Germanici 2: Cytospora chrysosperma has been shown to inhabit healthy bark of aspen and beech, causing disease only in trees or branches of low vigour or when the hosts are stressed by drought, injury, sunscald, fire, or chrysospermq pathological disorders. Google cookies and technologies Google Analytics: To our knowledge, this is the first report of Cytospora canker on white poplar in Israel.

Any rough or excessive handling of dry or moist seeds at harvest or planting can cause cracked seedcoats and kill seed embryos. Specimens and strains links: Decayed seeds are elongated, shriveled, discolored, and often covered with white mold growth Figure 3.

The spores ooze out, forming long, orange-red, coiled “spore tendrils”. Contains Matches exactly Value is undefined.

Cytospora chrysosperma CFL v1. The inner bark turns black and sometimes gives off a foul salty odor. After the infection is initiated, part of the bark dies and a true canker may form in rare cases Other information The disease causes greater damage in young trees. Bernard Chrysosper,a 1 and Dr.

Cytospora chrysosperma

Since pathogens of poplars and pines tend to track their hosts chdysosperma better detection and surveillance are essential. Feedback on this page. Contact our curators Dr. Their long necks converge to form a circle of openings in a disc which protrudes through the cracked bark Figure 4a and b.


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 sapwood appears reddish brown to black and water-soaked.

Perithecia of the sexual stage Valsa are rare and appear chrgsosperma the bark. The Cytospora Valsa fungus overwinters as mycelia and conidia or ascospores in diseased bark and wood. Your feedback is very important to us. Bark susceptibility may be induced by heating to approximately F 40 C which is not uncommon on hot summer days.

This is used when first reloading the page. Highly susceptible trees, such as Lombardy poplars Figure 1may die within 2 to 5 years after becoming infected. Cookies are small text files that contain a string of characters and cytoxpora identifies a browser.

Many factors affect seed quality. Cankers frequently start at wounds or branch stubs or at the base of dead twigs.

Cytospora canker

Healthy appearing, symptomless seeds also may be infected and can develop into blighted or infected seedlings. The pycnidia are much more abundant than the perithecia. Isolations made from affected branches yielded colonies of Cytospora chrysosperma Pers.: Any condition s All condition s. Lily Eurwilaichitr and Dr. We can observe a zone of dead bark, sunken and brown around the entry point, generally a wound or a dead twig. Using Google Analytics, we can see what content is cyytospora on our websites.

This stem disease commonly kills Lombardy poplars Populus nigra cv. Under the bark, the wood is discoloured, wet and foul-smelling. This disease appears as sunken, dead areas of brown bark, around an entry point of infection, generally a wound or dead twig.

Cankers on large stems with thick, rough bark may be imperceptible except chrysospeema yellowish to reddish brown spore horns sticky, thread-like masses of spores protruding from bark fissures Figure 3, right.


Lombardy poplar trees being killed by Cytospora canker. Reisolations from inoculated plants yielded C. 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.

Cytospora canker

This Add-on is available at http: Apples, choke cherryeastern cottonwoodelders, European white poplar, maple, mountain-ash, Norway maple, chryeosperma, silver maplesugar maplewater birchwhite birch. Seedlots with 20 to 40 percent of the seeds decayed by Phomopsis spp. Cytospora cankers on a Simon poplar in a nursery. Left, canker on a cytospoda arctic willow stem following transplant shock courtesy Dr.

Balsam poplargolden weeping willow, largetooth aspenLombardy poplar, trembling aspenwillow. We can also see orange-coloured fructifications and sometimes orange-coloured tendrils conidia coming out of the bark. We use cookies in a very limited number of scenarios that are all present to help the users to have an easier experience. Common Names of Plant Diseases. Outbreak prevention depends largely on a better understanding of how pathogens infect trees so that resistance can be developed and on early detection, yctospora of the disease can be reduced through monitoring and surveillance.

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. It cytpspora replaced each time there is a query done.