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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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Cytospora canker

We can observe a zone of dead bark, sunken and brown around the entry point, generally a wound or a dead twig. Under the bark, the wood is discoloured, wet and foul-smelling.

We can also see orange-coloured fructifications and sometimes orange-coloured tendrils conidia coming out of the bark. This disease appears as sunken, dead areas of brown bark, around an entry point of infection, generally a wound or dead twig. Under the bark, the wood is discoloured and wet and has an unpleasant odour.

Orange fruiting bodies and occasionally orange tendrils conidia protruding through the bark can also be seen. 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. The initial infection is followed by the death of part of the bark and rarely by the formation of a true 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.

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In disease affects already weakened or stressed trees, and the fungus usually gains entry through a wound on the branches or trunk.

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

After the infection is initiated, part of the bark dies and a true canker may form in rare cases. The disease causes greater damage in young trees.

Some hybrid poplars are much more vhrysosperma than indigenous species. 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 other pathological disorders. The presence of this disease generally indicates that the trees are under stress.

Other species of Valsaincluding Valsa abietis Fr. Balsam poplargolden weeping willow, largetooth aspenLombardy poplar, trembling aspenwillow. Apples, choke cherryeastern cottonwoodelders, European white poplar, maple, mountain-ash, Norway maple, oaks, silver maplesugar maplewater birchwhite birch.

Cytospora canker Valsa sordida. Description Micro-habitat s Trunk, Annual shoot, Branch Distribution Eastern Canada Damage, symptoms and biology We can chryslsperma a zone of dead bark, sunken and brown around the entry point, generally a wound or a dead twig. 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.

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Cytospora canker Spore tendrils of C.

Cytospora canker Poplar infected by Valsa sordidathe cause of Cytospora canker. Cytospora canker Spore tendrils on willow, characteristic of one type of fruiting of Valsa sordidathe causal agent of Cytospora canker. Cytospora canker Cytospora canker on aspen, caused by Valsa sordida. Feedback on this page.