Articles
CYTOSPORA CANKER OF APRICOTS
Article number
209_14
Pages
141 – 146
Language
Abstract
Cytosporal canker and dieback (Cytospora cincta SACC.= C. rubescens FR. (Gvritishvili, 1982) perfect form: Valsa cincta (FR.) Höhn.) is a widespread disease in apricot growing areas of Europe, excluding the Mediterranean.
The pathogen attacks xylem and bark tissues.
If the necrotic tissue completely girdles branches or trunk, the section above the girdled region dies.
When cambium necrosis does not girdle the branch or trunk, canker development ensues.
Apricot trees are susceptible to Cytospora infection from early summer to next bud opening, and in complete resistance occurs in the apricot trees. C. cincta infection causes a chronic, ever-spreading disease, characterized by continuous growth of canker from year to year.
The pathogen attacks xylem and bark tissues.
If the necrotic tissue completely girdles branches or trunk, the section above the girdled region dies.
When cambium necrosis does not girdle the branch or trunk, canker development ensues.
Apricot trees are susceptible to Cytospora infection from early summer to next bud opening, and in complete resistance occurs in the apricot trees. C. cincta infection causes a chronic, ever-spreading disease, characterized by continuous growth of canker from year to year.
Cytospora cincta is a facultative wound parasite which is able to penetrate living tissues either through fresh wounds or through died parts of the tree.
Frequently this fungus can colonize the cancerous wounds which were infected at first by Pseudomonas syringae or by Eutypa lata and so the original symptoms are masked. C. cincta produces an endotoxin which may cause xylem necrosis.
Authors
Zs.D. Rozsnyay
Keywords
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