1. UC IPM
Dry, orangish spore masses on the underside, and discolored spots on the upper side, of rose leaves infected by rose rust, <i>Phragmidium mucronatum.</i>.
Dry, orangish spore masses on the underside, and discolored spots on the upper side, of rose leaves infected by rose rust, Phragmidium mucronatum..
Credit: Jack Kelly Clark