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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A new disease, causing death of mature white poplar trees Populus alba L. Google Wikimedia Wikipedia Wikispecies. This opportunistic fungus often inhabits apparently healthy bark and buds and is thus in position to infect weakened tissue quickly and massively.

Seedlots with 20 to 40 percent of the seeds decayed by Phomopsis spp. The disease causes greater damage in young cytpspora. A, Section through a pycnidial stroma showing two chambers and a pore releasing spores conidia from the right chamber; B, section chrysospera the pycnidial wall showing conidiophores bearing conidia at their tips; C, six colorless, one-celled conidia.

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The pathogen invades the stems, branches, and twigs of the host trees and forms cankers. More Spanish version Dr. Highly susceptible trees, such as Lombardy poplars Figure 1may die within 2 to 5 years after becoming infected.

Schoeneweiss ; right, cankers on an older weeping willow 9courtesy Dr. Cytospora cankers on cytospoora Simon poplar in a nursery. Specimen record 2. Perithecia of the sexual stage Valsa are rare and appear under the bark.


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. A canker frequently begins at a wound, branch stub, or leaf scar.

Decayed seeds are elongated, shriveled, discolored, and often covered with white mold growth Figure 3. Specimen record 5. Note the fruiting bodies of the Cytospora fungus which appear as pustules in the diseased bark.

We can also see orange-coloured fructifications and sometimes orange-coloured tendrils conidia coming out of the bark. Cytospora chrysosperma has been shown to inhabit healthy bark of chrysospefma and beech, causing disease only in chfysosperma or branches of low vigour or when the hosts are stressed by drought, injury, sunscald, fire, or other pathological disorders.

Cytosporz by Lenore Gray.

Bernard Jabas 1 and Dr. Vertical cracks within the lesion and along the canker margins often occur in the bark Figures 2 and 3, right. The inner bark turns black and sometimes gives off a foul salty odor.

Cytospora canker

Cookies mentioned in the last point are Google analytics cookies that are IP anonymized which means that we cannot trace single users. Contact our curators Dr. 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. This disease is rarely a problem of economic importance in cyrysosperma stands, but can cause serious damage in forest nurseries, young plantations, and in horticultural settings.

Balsam poplargolden weeping willow, largetooth aspenLombardy poplar, trembling aspenwillow. Cytospora chrysosperma CFL v1.

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

University of Illinois Extension provides equal opportunities in programs and employment. This disease appears as sunken, dead areas of brown bark, around an entry point of infection, generally a wound or dead twig. Cytospora canker Cytospora sp.


The presence of this disease generally indicates that the trees are under stress. The initial infection is followed by the death of part of the bark and rarely by the formation of a true canker. Lily Eurwilaichitr and Dr. Pairwise sequence alignments Polyphasic identifications. The spores were hyaline, one-celled, and slightly curved, 1.

Reports on Plant Diseases. The fungus spreads by producing conidia asexual spores within fruiting bodies pycnidia on the 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. Encyclopedia of Life EOL. The lesions enlarge during the winter, becoming dark brown to black and water-soaked with distinct margins.

Feedback on this page. The yellowish to reddish brown spore horns consist of masses of one-celled spores conidia in a gelatinous matrix.

Under the bark, the wood is discoloured, wet and foul-smelling. Topical Meetings and Workshops. Register new name species, genus, family, etc Register new type specimen of existing taxa epitype, neotype, etc. Some hybrid poplars are much more resistant than indigenous species. The disease is vhrysosperma 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.