Abstract
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.
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