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Control of Dutch elm disease by induced host resistance
Author(s) -
Sutherland M. L.,
Mittempergher L.,
Brasier C. M.
Publication year - 1995
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1995.tb01346.x
Subject(s) - dutch elm disease , conidium , biology , horticulture , inoculation , canker , ophiostoma , ulmaceae , botany , plant disease resistance , ceratocystis , fungus , disease control , microbiology and biotechnology , genetics , gene
Summary A range of fungi was screened for the ability to suppress symptoms of Dutch elm disease in European and hybrid elms under UK and Italian field conditions. The efficacy of the preventative inoculations varied Considerably between elm clones of differing resistance to the causal fungus Ophiostoma novoulmi . On susceptible English elm, Ulmus procera , preventative inoculations with conidia of Verticillium dahlias, Opbiostoma ulmi or Ophiostoma piceae (OPH form) caused no reduction in final disease levels. On U. x bollandica cv.‘Commelin’, pretreatment with V. dabliae or O. ulmi reduces final disease levels, but not significantly, On the elm clone Ca06 of U. carpinifolia , and on the hybrid clones FL025 and 196–6, significant (p0.05) symptom suppression occurred in trees pretreated with O. ulmi or V. dahliae . On the more resistant elm clones 3–14 and Lobel, only V. dahliae was an effective pretreatment (p0.05). Certain pretreatment fungi alone caused symptoms in some of the elm clones. Major difficulties in using this approach to control Dutch elm disease are discussed.The technical assistance by F. C. B aldwin , R. B rooker , S. A. K irk and J. R ose at the Forest Research Station, Alice Holt, and by A. F agnani and F. F errini at CNR, Florence, as well as statistical advice from A. J. P eace at Alice Holt, is gratefully acknowledged.The authors would like to thank the Pilkington Charitable Trust for funding the research in the UK and lsotron plc, Swindon, Berkshire, for gamma irradiating the conidial suspensions. The Italian contribution was supported by the National Research Council of Italy, special project RAISA, subproject no. 2, paper no. 2133. The authors also thank John GIBBS for helpful comments on the manuscript.