Phragmidium violaceum (weed pathogen)

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Phragmidium violaceum symptoms on Rubus armeniacus (click on image to enlarge it)
Author(s): Eric Coombs, Oregon Department of Agriculture
Source: IPM Images

Phragmidium violaceum (weed pathogen) (C. Schultz) Winter - (blackberry rust)

This rust fungus infects both weedy/invasive as well as cultivated species of blackberry like European blackberry (Rubus fruticosus agg.). It was released in Australia in the 1980s and 1990s against invasive blackberries in Australia. For literature covering rust of cultivated blackberry see P. violaceum on crops.