Golovinomyces cichoracearum

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Golovinomyces cichoracearum symptoms on Zinnia (click on image to enlarge it)
Source: Florida Department of Agriculture and Consumer Services - IPM Images
Golovinomyces cichoracearum symptoms on Phlox (click on image to enlarge it)
Source: Dow Gardens - IPM Images

Golovinomyces cichoracearum (DC.) V.P. Heluta 1988 - (powdery mildew of cucurbits)

The fungus is widely distributed and causes powdery mildew diseases on many crops. In particular, cucurbits, potato, lettuce and ornamentals are susceptible. Symptoms appear first as yellow leaf spots and later typical white powdery spore masses develop on both leaf surfaces. The fungus seems to prefer moderate temperatures and commonly develops during spring or early summer. Disease progress is rapid under suitable conditions with an incubation period of a week or less.

Conidia are formed in long chains. They are ellipsoid about 30-40 x 20 µ in size. The asci have an ovate shape about 70-80 x 15 µ in size and usually contain 2 ascospores per ascus. See also Podosphaera xanthii which causes a similar disease.

Vernacular names
• Deutsch: Echter Mehltau der Gurke
• English: powdery mildew of cucurbits
phlox powdery mildew
potato powdery mildew
plantain powdery mildew
powdery mildew of potato
powdery mildew of plantain
• Français: blanc du plantain

Synonyms:
Erysiphe cichoracearum