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.
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Publication Revised July 2009