ISHS Acta Horticulturae 209: II International Workshop on Apricot Culture and Decline, XXII IHC
CYTOSPORA CANKER OF APRICOTS |
| Author: | Zs.D. Rozsnyay |
| 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. 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. | |
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