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Leaf mold disease caused by Cladosporium fulvum appeared on tomato cultivars carrying the Cf-9 resistance gene in Nara Prefecture, Japan, in 2018. We inoculated a differential set of tomato cultivar with six isolates of the fungus and identified two isolates as race 2.9 and four as 2.4.9. We also sequenced their Avr and mating-type genes. All Avr alleles have been found previously in Japanese populations of C. fulvum, but the genotypes of both races were new, suggesting that these isolates have newly emerged in Nara Prefecture. [ABSTRACT FROM AUTHOR]

Auxotrophic and drug resistant mutants have been isolated in five of the seven races of Fulvia fulva (syn. Cladosporium fulvum) following UV mutagenesis. Drug resistant mutants have also been isolated by genetic transformation using vectors conferring resistance to hygromycin B and phleomycin. Protoplasts of complementing auxotrophs or mutants with different drug resistances have been fused to form diploids as demonstrated by growth characteristics and microfluorimetry. Some of the diploid fusion products remained stable but most went on to haploidise spontaneously. Using this technique it is now possible to perform both complementation and linkage analysis in an imperfect fungal plant pathogen. [ABSTRACT FROM AUTHOR]

Leaf mold symptoms were found on tomato varieties carrying the Cf-9 resistance gene against Passalora fulva, the causal agent of leaf mold, in Japan in 2008. Disease symptoms and morphological characteristics of the isolates were similar to those of P. fulva. After inoculating a set of tomato differentials with the isolates, all isolates were identified as race 2.9 of P. fulva, previously unreported. [ABSTRACT FROM AUTHOR]

Leaf mold of tomato was found on cv. Momotaro-fight in 2003 in Ehime Prefecture. The symptoms were marginal indefinite yellowing on the upper leaf surface, and downy, gray to brown sporulation on the lower surface underneath the spots. The symptoms and morphology were the same as seen with Passalora fulva. The fungal isolates were identified as races 2.4, 2.4.11, 4, and 4.11 by inoculation tests. Races 4 and 4.11 have never before been found in Japan. [ABSTRACT FROM AUTHOR]