Assessment of Phaeotheca dimorphospora for biological control of the Dutch elm disease pathogens, Ophiostoma ulmi and O. novo-ulmi |
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| Authors: | L BERNIER D YANG G B OUELLETTE & M DESSUREAULT |
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| Institution: | Centre de Recherche en Biologie Forestière, Facultéde Foresterie et de Géomatique, UniversitéLaval, Sainte-Foy, Québec, Canada, G1K 7P4;, Centre de Foresterie des Laurentides, Service Canadien des Forêts, Sainte-Foy, Québec, Canada, G1V 4C7 |
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| Abstract: | The antagonistic fungus Phaeotheca dimorphospora was tested as a biocontrol agent against the Dutch elm disease pathogens, Ophiostoma ulmi and O. novo-ulmi , on Ulmus americana seedlings in the glasshouse. Curative inoculation of seedlings with P. dimorphospora had no significant effect on disease development. Conditioning inoculation of seedlings with the antagonist protected them against O. ulmi but not against the more aggressive O. novo-ulmi . In seedlings challenged with both the antagonist and either one of the pathogens, P. dimorphospora only spread locally around the inoculation point; however, the pathogens spread systemically throughout the whole plant. O. novo-ulmi survived in the region colonized by P. dimorphospora , whereas O. ulmi did not. |
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