First Report of Powdery Mildew of <i>Excoecaria cochinchinensis</i> Caused by <i>Pseudoidium neolycopersici</i> in China

Xu, Dandan; Huang, Zibin; Zhang, X.-M.; Li, M.-H.; Huang, Hui-Yuan; Zeng, Qingqian

doi:10.1094/pdis-04-19-0841-pdn

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“…Consequently, the powdery mildew on C. halicacabum is here identified as E. neolycopersici. E. neolycopersici was originally found on leaves and stems of tomato [2,42], further recorded on other solanaceous plants [9,[58][59][60][61], and on hosts in a variety of plant families such as Caricaceae [41,62], Euphorbiaceae [63,64], Moringaceae [65], and Fabaceae [66]. There are only a few records of PMs on the family Sapindaceae, mainly on woody plants [67]; and the recorded PMs on the herbaceous plant genus Cardiospermum were Oidium spp.…”

Section: Description: (On I Aquatica Tnm F0034602)mentioning

confidence: 99%

New Records of Powdery Mildews from Taiwan: Erysiphe ipomoeae comb. nov., E. aff. betae on Buckwheat, and E. neolycopersici comb. nov. on Cardiospermum halicacabum

Hsiao¹,

Ariyawansa

Hsu³

et al. 2022

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Erysiphe is the largest genus of powdery mildews (PMs), a group of obligate plant pathogenic fungi. Exploration of biodiversity generally relies on regional surveys and our aim is to investigate the PMs in Taiwan. Collections of the fungi on five plant species around agricultural environments were subjected to morphological and molecular characterization, using both internal transcribed spacer (ITS) and β-tubulin gene (TUB2) regions for the phylogenetic analyses. Erysipheipomoeae comb. nov., a species able to infect Ipomoea obscura and I. aquatica demonstrated by pathogenicity tests, has been neotypified. The two buckwheat species, Fagopyrum esculentum and F. tataricum, are found to be hosts of E. aff. betae. These results suggest that hosts in some plant families can be infected by more than one Erysiphe pathogen, e.g., Convolvulaceae by E. ipomoeae and E. convolvuli and Polygonaceae by E. polygoni and E. aff. betae, respectively. In addition, phylogenetic analyses of PMs on Cardiospermum halicacabum and tomato belonging to the E. aquilegiae complex are allocated under E. neolycopersici comb. nov. This extends the potential host range of E. aquilegiae complex to the plant family Sapindaceae. We conclude that awareness of the host associations of PMs can potentially benefit crop disease management.

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