Australasian Plant Pathology

, Volume 20, Issue 2, pp 67–72 | Cite as

Phoma clematidina, causal agent of leafspot and wilt of Clematis in New Zealand

  • G. R. Smith
  • A. L. J. Cole


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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Anon (1898)—Clematises dying. The Garden 54: 99.Google Scholar
  2. Arthur, J.C. (1885)—Disease of Clematis. New York State Agricultural Experiment Statio, Third Annual Report (1884). pp. 383–385.Google Scholar
  3. Blok, I. (1963)—Verwelkingsziekte in clematis. Jarrboek (1963) Profestation voor Boomkwekerij te Boskop. pp. 86–89.Google Scholar
  4. Blok, I. (1965)—Verwelkingszikte in clematis. Jarrboek (1965) Profestation voor Boomkwekerij te Boskop. pp. 80–82.Google Scholar
  5. Boerema, G.H. (1979)—Mycologisch-taxonomish onderzoek verslagen en mededelingen. Plantenziekenkundige Dienst 153: 1–21.Google Scholar
  6. Boerema, G.H. and Bollen, G.J. (1975)—Conidiogenesis and conidial septation as differentiating criteria between Phoma and Ascochyta. Persoonia 8: 111–144.Google Scholar
  7. Bos, J.R. (1893)—Phytomyza affinis Fall. as a cause of decay in clematis. Insect Life 6: 92–93.Google Scholar
  8. Comstock, J.H. (1890)—The clematis disease. Garden and Forest 3: 59.Google Scholar
  9. 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.Google Scholar
  10. De Waard, M.A. and van Nistelrooy, J.G.M. (1982)—Antagonistic and synergistic activities of various chemicals on the toxicity of fenarimol to Aspergillus nidulans. Pesticide Science 13: 279–286.CrossRefGoogle Scholar
  11. Ebben, M.H. and Last, F.T. (1966)—Clematis wilt. Annual Report — Glasshouse Crops Research Institute 1965. pp. 128–131.Google Scholar
  12. Gloyer, W.O. (1915)—Ascochyta clematidina, the cause of stem rot and leafspot of clematis. (a) Journal of Agricultural Research 4: 331–342. (b) New York State Agricultural Experiment Station, Geneva Technical Bulletin Number 44.Google Scholar
  13. Hayat, M.A. (1975)—Positive staining for electron microscopy. Van Nostrand Reinhold Company: New York.Google Scholar
  14. Maag, R. (1982)—Corbel: fungicide against cereal diseases. BASF Aktiengesellschaft Agricultural Research Station. D-6703 Limburgerhof, Federal Republic of Germany.Google Scholar
  15. Morel, F. (1903)—La maladie noire des clematites. Revue Horticole pp. 364-365.Google Scholar
  16. Prillieux, E.E. and Delacroix, G. (1894)—Maladies bacillaires de divers végétaux. Comptes Rendus Hebdomadaires des Séances de l’Academie des Sciences (Paris) 118: 668–671.Google Scholar
  17. Rayner, R.W. (1970)—A mycological colour chart. Commonwealth Mycological Institute and the British Mycological Society: Kew, Surrey.Google Scholar
  18. Smith, G.R., Cole, A.L.J. and Munro, M.H.G. (1987)—Leafspot and wilt of large flowered Clematis hybrids caused by Phoma clematidina (Thüm.) Boerema. Australian Microbiologist 8: 210.Google Scholar
  19. Spurr, A.R. (1969)—A low-viscosity epoxy resin embedding medium for electron microscopy. Journal of Ultrastructural Research 26: 31–43.CrossRefGoogle Scholar
  20. Whitehead, S.B. (1959)—Garden clematis. John Gifford: London.Google Scholar

Copyright information

© Australasian Plant Pathology Society 1991

Authors and Affiliations

  • G. R. Smith
    • 1
  • A. L. J. Cole
    • 1
  1. 1.Department of Plant and Microbial ScienceUniversity of CanterburyChristchurch 1New Zealand

Personalised recommendations