Plant Pathology (2003) 52, 579-585

A. Solla and L. Gil (2003)
Evaluating Verticillium dahliae for biological control of Ophiostoma novo-ulmi in Ulmus minor
Plant Pathology 52 (5), 579-585
Abstract: The ability of isolate Vd-48 of Verticillium dahliae to induce resistance against subsequent challenge with Ophiostoma novo-ulmi was examined in Ulmus minor. In the first experiment, conditioning inoculation of 5-year-old elm trees (2-3 m in height) with Vd-48 15 days prior to challenge inoculation with O. novo-ulmi significantly reduced wilting (P < 0.05) compared with trees not conditioned with Vd-48. However, in another experiment on 6-year-old trees (2-3·5 m in height), no protection was achieved when the length of time between conditioning and challenge inoculations was 45 or 60 days. In a further experiment, inoculations with Vd-48 alone resulted in severe wilting in 22 out of 118 trees (6-10 years old and 4-7 m in height). Across the 2 years of this last trial, nine trees showed massive feeding wounds made by Scolytus sp., while O. novo-ulmi strains were isolated from six trees. Vd-48 provided a variable prophylactic effect against O. novo-ulmi in U. minor. Major difficulties with this approach to control Dutch elm disease are discussed.
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Database assignments for author(s): Luis Gil, Alejandro Solla

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ophiostoma novo-ulmi	Elm (Ulmus)	Spain (continental)