Plant Disease (2005) 89, 237-240

Matias Pasquali, Flavia Dematheis, Giovanna Gilardi, Maria Lodovica Gullino and Angelo Garibaldi (2005)
Vegetative compatibility groups of Fusarium oxysporum f. sp. lactucae from lettuce
Plant Disease 89 (3), 237-240
Abstract: Fusarium oxysporum f. sp. lactucae, the causal agent of Fusarium wilt of lettuce, has been reported in three continents in the last 10 years. Forty-seven isolates obtained from infected plants and seed in Italy, the United States, Japan, and Taiwan were evaluated for pathogenicity and vegetative compatibility. Chlorate-resistant, nitrate-nonutilizing mutants were used to determine genetic relatedness among isolates from different locations. Using the vegetative compatibility group (VCG) approach, all Italian and American isolates, type 2 Taiwanese isolates, and a Japanese race 1 were assigned to the major VCG 0300. Taiwanese isolates type 1 were assigned to VCG 0301. The hypothesis that propagules of Fusarium oxysporum f. sp. lactucae that caused epidemics on lettuce in 2001-02 in Italian fields might have spread via import and use of contaminated seeds is discussed.
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Database assignments for author(s): Matias Pasquali

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Fusarium oxysporum f.sp. lactucae		Japan
	Fusarium oxysporum f.sp. lactucae		Taiwan
	Fusarium oxysporum f.sp. lactucae	Lettuce (Lactuca)	Italy
	Fusarium oxysporum