Isolates of Fusarium oxysporum f. sp. lactucae obtained from six localities in Japan were divided into three patho-genicity 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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Received 21 February 2001/ Accepted in revised form 28 May 2001
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YAMAUCHI, N., HORIUCHI, S. & SATOU, M. Pathogenicity Groups in Fusarium oxysporum f. sp. lactucae on Horticultural Types of Lettuce Cultivars. J Gen Plant Pathol 67, 288–290 (2001). https://doi.org/10.1007/PL00013032
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DOI: https://doi.org/10.1007/PL00013032