Puccinia jaceae (Otth.)

Plant species attacked: Diffuse knapweed | Spotted knapweed
Biocontrol Agent Type: Leaf and stem rust (fungus)
Country of Origin: The populations in BC orginated in western Europe
First Released in BC: Adventive
Click on image to view larger photo: Puccinia jaceae rust pustules on knapweed
 
Positive monitoring and/or dispersal locations in BC on Diffuse knapweed:
(click image to view larger map)
Established Puccinia jaceae on Diffuse knapweed locations
 
View the in-depth Puccinia jaceae information page here