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Identification, pathogenicity and comparative virulence of Fusarium spp. associated with insect-damaged, diseased Centaurea spp. in Europe
- Fusarium spp. isolated from insect-infested, diseased Centaurea diffusa and Centaurea maculosa in Europe were assessed for pathogenicity to North American plants of their respective original hosts: either C. diffusa or C. maculosa. Of the ten isolates of Fusarium spp. isolated from diseased Centaurea spp. in the Caucasus region of Russia and eastern Europe, all caused one or more disease symptoms or reductions in fresh weight of North American accessions of their original host species. In three instances, these reductions were statistically significant (p = 0.05). Symptoms included overall stunting, root lesions, and crown rot. Reductions in fresh weight of C. diffusa ranged from 17-78%, and C. maculosa exhibited reductions of 18-82%. The pathogenic cultures were identified as F. solani, F. tricinctum and F. oxysporum. Six of seven other cultures were identified as F. oxysporum, and one as F. tricinctum. It was concluded that further screening of a larger set of isolates of foreign Fusarium spp. under quarantine conditions stateside or in limited USDA-ARS overseas facilities is justified and promising.
Caesar, A.J. , Campobasso, G. , Terragitti, G.
Centaurea diffusa , Centaurea stoebe subsp. stoebe , Centaurea stoebe subsp. micranthos , Fusarium , plant pathogenic fungi , pathogen identification , pathogenicity , virulence , signs and symptoms (plants) , plant growth , insect pests , plant damage , biological control agents , weed control , synergism , Europe , Russia , Hungary , Slovakia
- Includes references
- BioControl 2002 Apr., v. 47, no. 2
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.