Downy Mildew

Pseudoperonospora cubensis

Symptoms:
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.

Control:
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.

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