Plants infected by chrysanthemum white rust exhibit spots on the upper surfaces of leaves. White rust can infect plants both locally and systemically. Controlling white rust is very difficult due to the nature of the 'Albugo' pathogen. This organism causes white rust or white blister diseases in above-ground plant tissues. White rust can be a devastating disease on many important agricultural crops throughout the world. White rust is an important economic disease, causing severe crop losses if not controlled.