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.

Author: Fauran Fautaur
Country: China
Language: English (Spanish)
Genre: Video
Published (Last): 18 August 2008
Pages: 154
PDF File Size: 8.67 Mb
ePub File Size: 10.84 Mb
ISBN: 773-9-16690-728-6
Downloads: 85203
Price: Free* [*Free Regsitration Required]
Uploader: Tomuro

Cytospora chrysosperma left as it would be seen under a high-power microscope.

Severely infected trees usually die branch by branch often producing sprouts at the base of the trunk which also become infected and die. The fungus grows through the bark cells and the outer few rings of wood. The spores were hyaline, one-celled, and slightly curved, 1. A herbarium specimen was deposited at the U. They are sent to a computer by website operators or third parties. Cytospora chrysosperma CFL v1.

We can also see orange-coloured fructifications and sometimes orange-coloured tendrils conidia coming out of the bark. The stromata are shaped like short cones with flattened, gray-brown to black tips that break through the bark surface as small dark pimples or pustules Figure 3. Symptoms of blackstem occur in the fall as small lesions at the ends of cuttings or at leaf scars chdysosperma lenticels, usually on stems but occasionally on the roots.


The affected branches turned yellowish brown, and the inner bark turned black. The spores ooze out, forming long, orange-red, coiled “spore tendrils”. To our knowledge, this is the first report of Cytospora canker on white poplar in Israel.

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

Matches exactly Value is undefined. The disease causes greater damage in young trees. Under moist conditions, spore masses oozed out in long, reddish brown, coiled tendrils.

Specimens and strains links: Schoeneweiss ; right, cankers on an older weeping willow 9courtesy Dr. Reports on Plant Diseases.

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

The Cytospora fungus has been reported on a number of hosts Table 1. Discrete cankers first appear on young trees as brown, slightly sunken areas in the smooth bark of crysosperma and trunks Figure 3, left. Infection usually occurs through bark wounds typically resulting from mechanical damage. Contact Us – Report a Bad Link. Twigs commonly die without the formation of typical lesions. The lesions enlarge during the winter, becoming dark brown to black and water-soaked with distinct margins.


Cytospora canker of willow. Plant Disease Management Reports.

Cytospora canker

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

Specimen record 5. Many factors affect seed quality. Note the sunken girdling cankers on the branches and trunk and the flow of gum oozing from the dead tissues Illinois Natural History Survey photo.

Cytospora canker

We use cookies in a very limited number of scenarios that are all present to help the users to have an easier experience. Pairwise identification Polyphasic identification.

It attacks several hardwoods, notably trees used for bioenergy such as cottonwood, trembling cytodpora, and willows. Click on the language titles to launch them. Your feedback is very important to us. No other cookies than the ones mentioned above are used on our websites. A canker frequently begins at a wound, branch stub, or leaf scar.