Oidium sp.
![Creator: Ross Beever. © Landcare Research. [Image: 17S8]](https://data.landcareresearch.co.nz/Image/17S8/SysPortalThumb)
![Creator: Ross Beever. © Landcare Research. [Image: 17S9]](https://data.landcareresearch.co.nz/Image/17S9/SysPortalThumb)
![REB 1344, 7/6/93, AK, on Weinmania sylvicola (as E. polygoni). © R.E. Beever. [Image: IG6]](https://data.landcareresearch.co.nz/Image/IG6/SysPortalThumb)
![Creator: Ross Beever. © Landcare Research. [Image: 17S8]](https://data.landcareresearch.co.nz/Image/17S8/SysPortalPreview)
![Creator: Ross Beever. © Landcare Research. [Image: 17S9]](https://data.landcareresearch.co.nz/Image/17S9/SysPortalPreview)
![REB 1344, 7/6/93, AK, on Weinmania sylvicola (as E. polygoni). © R.E. Beever. [Image: IG6]](https://data.landcareresearch.co.nz/Image/IG6/SysPortalPreview)
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Details
Details
Oidium sp.
Oidium sp.
Nomenclature
invalidly published
ICN
Oidium sp.
species
Oidium sp.
Classification
Synonyms
Associations
View full associations recordhas host
Descriptions
Perithecia have been collected only on Aristotelia sp. and only in Canterbury. In the North Island, as with other species of powdery mildew, only the oidium conidial form is present. It was first recorded from New Zealand by Berkeley (1855) on the indigenous host Aristotelia as Erysiphe densa. Salmon (1900) showed this fungus to be a synonym of E. polygoni. In the autumn it is very common throughout the country, but only when weather conditions are unfavourable are losses in fodder crops such as swede and rape likely to become severe. Brien, Chamberlain et al. (1955) reported that it may cause dwarfing and distortion of pea plants. Except for the two species of Aristotelia and Geum urbanum all host plants are introduced cultivars.
Oidium sp.
In New Zealand, powdery mildews rarely form Perithecia and the Oidium conidial stages are difficult to identify unless the fungus is known to be host specific. Thus records have been placed under Oidium. On tree tomato (Cyphomandra betaceae) mildew can cause severe defoliation (Fletcher, 1952). It is also common throughout New Zealand on Euonymus hedges.
Taxonomic concepts
Erysiphe polygoni sensu auct. NZ
Collections
Metadata
565e2aca-1182-449d-9265-add141357808
scientific name
Names_Fungi
18 February 2004
6 July 2010
