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Abstract

Powder mildews, caused by the Erysiphales, which consist of various different tribes, genera and species, are popular diseases causing severe damage on many economically important crops in Vietnam. The identification is important for biocontrol as well as fullfilling gaps in knowledge of the world about their distributions and epidemics. In current study, Erysiphe quercicola has been discovered in Vietnam for the first time as causal agent of powdery mildew disease on mango (Mangifera indica) based on both molecular and morphological classifications and pathogenicity test as well. Phylogenetic analysis using ITS sequences clearly demonstrated that this species in Vietnam belongs to E. quercicola group with strong bootstrap supports of 99% in both MP, PAUP 4.0 and ML, MEGA7 analyses. The 28S ribosomal DNA sequence analysis for better elucidation its phylogeny and taxonomic structure also has had similar result.