Observation 84853: Pucciniales Clem. & Shear
When: 2011-05-11
No herbarium specimen

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I doubt it’s Phragmidium violaceum
By: Andrew Khitsun (Andrew)
2013-04-21 19:37:39 CDT (-0400)

That species seems to appear in Pacific Northwest on a few species of invasive blackberry only, and it’s claimed not to infect any native plants. The species in question here is all over the place here in Wisconsin on native dewberry. Is there more information on Phragmidium violaceum being widespread around here?
Here is a link to a document from Pacific Northwest on Phragmidium violaceum:
http://www.pnwfungi.org/...

Rust
By: Darvin DeShazer (darv)
2012-03-18 21:58:38 CST (-0500)

Dewberry and brambles are the alternate host for the rust Pucciniasrtum arcticum. The aecia form on the main host, Picea glauca (white spruce). But the uredinia stage infects dewberry and causes yellow-brown leaf spot.

Fungal or not?
By: Andrew Khitsun (Andrew)
2011-12-18 11:20:00 CST (-0500)

Yet another beautiful pattern, but not sure if it’s fungal or caused by other organisms. The plant appears to be Rubus hispidus – Bristly Dewberry. See also observation 85537, which may or may not be a similar disease.

Created: 2011-12-18 11:16:43 CST (-0500)
Last modified: 2013-04-21 19:37:48 CDT (-0400)
Viewed: 86 times, last viewed: 2017-06-10 07:14:29 CDT (-0400)
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