Anthracnose diseases of fruit crops are mainly caused by Colletotrichum gloeosporioides and C. acutatum. In these Colletotrichum species, intra- and interspecific variation in fungicide sensitivity has been reported; however, the relationship between fungicide sensitivity and molecular phylogeny has not been analyzed. Fifty-one isolates from 10 fruit crops, acacia, and tea were tested for their sensitivities to thiophanate-methyl, diethofencarb, and iminoctadine-triacetate, and their internal transcribed spacer (ITS) and 5.8S regions of rDNA were analyzed. C. gloeosporioides isolates were divided into sensitive, less sensitive, intermediate resistant, or resistant to the three fungicides. In contrast, C. acutatum isolates were all less sensitive. In molecular phylogenetic analyses, C. gloeosporioides isolates fell into the same genetic group, whereas C. acutatum isolates were placed into two genetic groups. Although phylogenetic relationship was not closely related to fungicide sensitivity, the isolates of C. gloeosporioides most resistant to iminoctadine-triacetate were found in the same phylogenetic subgroup.

The causal fungus of Ceratocystis canker of fig in Japan is described as Ceratocystis ficicola sp. nov. This species is characterized by galeated ascospores and is similar to Ceratocystis fimbriata sensu lato. However, the perithecia of the new species are much larger than those of C. fimbriata. The fungus grows more rapidly than C. fimbriata sensu stricto at 25°C but more slowly at 30°C. Molecular analysis of the nucleotide sequences of rDNA ITS regions showed that C. ficicola is phylogenetically placed in the clade of C. fimbriata s. l. but is easily distinguishable from other species of C. fimbriata s. l.

Diaporthe kyushuensis sp. nov. is described and named as the teleomorph of causal fungus of grapevine swelling arm. The anamorph of the fungus is Phomopsis vitimegaspora.In the 1960s, a new canker disease of the grapevine cultivar Kyohou (V. viniferax V. labrusca) was noticed

Five isolates of the pathogen that causes downy mildew in spinach, Peronospora farinosa f. sp. spinaciae, collected in Fukuoka Prefecture, Japan, in 2019 were identified as two races, which were distinct from races 1-17 authorized by the International Working Group on Peronospora. The races were temporarily named J19-1 and J19-2.J19-1 reacted to race-differential cultivars similar to an isolate from the United States, UA201502. However, the response of J19-2 to race-differential cultivars differed from any reported races.