Phoma clematidina, causal agent of leafspot and wilt of Clematis in New Zealand Article Received: 31 May 1990 Accepted: 14 November 1990 DOI:
Cite this article as: Smith, G.R. & Cole, A.L.J. Australasian Plant Pathology (1991) 20: 67. doi:10.1071/APP9910067 Abstract Phoma clematidina (Thüm.) Boerema is shown to be the causal agent of leafspot and wilt of large-flowered Clematis L. hybrids, and leafspot of clematis species. P. clematidina is a wound pathogen and causes leafspots on both wilt susceptible and wilt resistant cultivars. Wilting is usually the result of nodal rotting or ‘stem girdling’ following hyphal extension into the node from the infected leaf. Resistance to wilt is manifested by abscission or senescence of infected leaves. The fungicides chlorothalonil and fenpropimorph were the most effective of those tested for inhibiting spore germination and mycelial growth, respectively. A mixture of these fungicides significantly reduced the number of leaf lesions after wound inoculation. Other fungicides, including dichlofluanid, captafol, prochloraz and propiconazole, also displayed in vitro fungicidal activity and could be useful alternative sprays for chemical control, although proper plant hygiene and maintenance are important for disease-free clematis. References
Anon (1898)—Clematises dying.
Arthur, J.C. (1885)—
Disease of Clematis. New York State Agricultural Experiment Statio, Third Annual Report (1884). pp. 383–385.
Blok, I. (1963)—Verwelkingsziekte in clematis.
Jarrboek (1963) Profestation voor Boomkwekerij te Boskop. pp. 86–89.
Blok, I. (1965)—Verwelkingszikte in clematis.
Jarrboek (1965) Profestation voor Boomkwekerij te Boskop. pp. 80–82.
Boerema, G.H. (1979)—Mycologisch-taxonomish onderzoek verslagen en mededelingen.
Boerema, G.H. and Bollen, G.J. (1975)—Conidiogenesis and conidial septation as differentiating criteria between
Phoma and Ascochyta
Bos, J.R. (1893)—
Fall. as a cause of decay in clematis.
Comstock, J.H. (1890)—The clematis disease.
Garden and Forest
Cowling, E.B. (1978)—The engineering mechanics of pathogenesis. In:
Plant Disease: An Advanced Treatise. Volume III: How plants suffer from disease
. (Eds J.G. Horsfall and E.B. Cowling) pp. 299–325. Academic Press, London.
De Waard, M.A. and van Nistelrooy, J.G.M. (1982)—Antagonistic and synergistic activities of various chemicals on the toxicity of fenarimol to
CrossRef Google Scholar
Ebben, M.H. and Last, F.T. (1966)—Clematis wilt.
Annual Report — Glasshouse Crops Research Institute 1965. pp. 128–131.
Gloyer, W.O. (1915)—
, the cause of stem rot and leafspot of clematis. (a)
Journal of Agricultural Research
: 331–342. (b)
New York State Agricultural Experiment Station, Geneva Technical Bulletin
Hayat, M.A. (1975)—
Positive staining for electron microscopy
. Van Nostrand Reinhold Company: New York.
Maag, R. (1982)—Corbel: fungicide against cereal diseases. BASF Aktiengesellschaft Agricultural Research Station. D-6703 Limburgerhof, Federal Republic of Germany.
Morel, F. (1903)—La maladie noire des clematites.
Revue Horticole pp. 364-365.
Prillieux, E.E. and Delacroix, G. (1894)—Maladies bacillaires de divers végétaux.
Comptes Rendus Hebdomadaires des Séances de l’Academie des Sciences (Paris)
Rayner, R.W. (1970)—A mycological colour chart. Commonwealth Mycological Institute and the British Mycological Society: Kew, Surrey.
Smith, G.R., Cole, A.L.J. and Munro, M.H.G. (1987)—Leafspot and wilt of large flowered
hybrids caused by
Spurr, A.R. (1969)—A low-viscosity epoxy resin embedding medium for electron microscopy.
Journal of Ultrastructural Research
CrossRef Google Scholar
Whitehead, S.B. (1959)—
. John Gifford: London.
Google Scholar Copyright information
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