Sphaerotheca pannosa, Erysiphe cichoracearum, Oidium spp.

Crime report

A fuzzy, white fungal growth appears first on leaves, then on stems and flowers. If left unchecked, the powdery colonies on the upper surface of the leaf will continue to grow until the entire leaf surface is covered.

Infected new growth may be dwarfed or distorted.

Powdery mildew spores may be released if heavily infected plants are disturbed. 

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