Pathogenicity groups in Fusarium oxysporum f. sp. lactucae on horticultural types of lettuce [Lactuca sativa] cultivars
2001
Yamauchi, N. (National Inst. of Vegetable and Tea Science, Ano, Mie (Japan)) | Horiuchi, S. | Satou, M.
Isolates of Fusarium oxysporum f. sp. lactucae obtained from six localities in Japan were divided into three pathogenicity groups. Group 1 was highly pathogenic to lettuce cultivars of crisphead and red leaf types and was less pathogenic to butterhead and green leaf type cultivars. Group 2 was highly pathogenic to butterhead type and less pathogenic to crisphead and leaf types. Group 3 was less pathogenic to all lettuce types than groups 1 and 2. These results indicated pathogenic differentiation in F. oxysporum f. sp. lactucae, roughly relating to horticultural types of host lettuce cultivars.
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