Abstract
Between 2002 and 2017, asexual morphs of powdery mildews (Erysiphales) were collected in Thailand from the following hosts: Cassia fistula, Castanopsis argyrophylla, Durio zibethinus, Jatropha curcas, Kydia calycina, Hevea brasiliensis, Hodgsonia macrocarpa, Mallotus philippinensis, Mimosa pudica, Nephelium lappaceum, Tamarindus indica and Ziziphus jujuba. Combined molecular and morphological analyses revealed that all these specimens belong to Erysiphe quercicola. Sequences retrieved from these powdery mildews are nested within the E. quercicola clade. These results show that Erysiphe quercicola may form its asexual morph on a very broad range of hosts belonging to various plant families, particularly in the tropics, in contrast to its sexual morph which is confined to oak species (Quercus, Fagaceae). Cassia fistula, Castanopsis argyrophylla, J. curcas, K. calycina, H. macrocarpa, M. philippinensis, M. pudica, T. indica and Z. jujuba are new host records for E. quercicola worldwide.
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