Downy Mildew

Pseudoperonospora cubensis

image of downy mildewimage of downy mildew damageimage of downy mildew damage

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Foliar symptoms begin with yellowish spotting, that eventually turns brown. A white to brown “fuzzy” mat of fungal mycelia occurs on the underneath leaf surface beneath each of the spots. Severely infected plants eventually lose their leaves and die.

Use resistant varieties and monitor leaf wetness to time fungicide sprays. Warm temperatures and wet leaves result in rapid disease spread.

See also The Texas Plant Disease Handbook.

The information given herein is for educational purposes only. Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Texas AgriLife Extension Service is implied.

Educational programs of the Texas AgriLife Extension Service are open to all people without regard to race, color, sex, disability, religion, age, or national origin.

Publication Revised July 2009

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