Causing Leaf Spot Disease in Key Tropical Fruit Crops in Thailand.

Fruit crops have a pivotal role in Thailand's economy. Continuous evaluation of 13 potential and emerging diseases in fruit crops is important. Necrotic and discolored leaf spots were observed in (avocado) and (mango). The isolated fungi from the leaf spot were identified through multi-loci phylogenetic analyses using a concatenated matrix of ITS, LSU, , and . The fungal isolates from were identified as , and isolates from were identified as . The pathogenicity assays confirmed that causes leaf spots of , while causes leaf blotch of The pathogenicity of and has been reported in China and Taiwan. Hence, this study provides a report of the novel geographical distribution of and . Moreover, the cross-inoculation tests of and on and were conducted, respectively. Both pathogens showed host specificity, as suggested by the phylogenetic relationship and the host plants. In addition, disease control with carbendazim, trifloxystrobin, mancozeb, and prochloraz was assayed. All fungicides equally inhibited the mycelial growth of both pathogens.