Chrysanthemum white rust on Chrysanthemum. Photo provided by: Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org

Chrysanthemum white rust on Chrysanthemum. Photo provided by: Central Science Laboratory, Harpenden Archive, British Crown, Bugwood.org

Chrysanthemum white rust on Chrysanthemum. Photo provided by: John W. Dooley, USDA APHIS PPQ, Bugwood.org