Pale, raised spots on the upper side of a florist's daisy, Chrysanthemum morifolium, leaf infected with Chrysanthemum white rust, Puccinia horiana.

Pale, raised spots on the upperside of a florist's daisy leaf infected with Chrysanthemum white rust. Credit: Central Science Laboratory, Harpenden, British Crown, Bugwood.org
Credit: Central Science Laboratory, Harpenden, British Crown, Bugwood.org