crops for at least two years. These cultural practices reduce pathogen populations and delay initial infections. Prepare a well-drained seed bed that is free of plant residues. Plant high-quality seed produced in dry climates and treated with a fungicide to reduce the likelihood of introducing disease on seed. Seed testing procedures are not available for fungal diseases. Therefore, seed treatment with a fungicide is recommended. Control weeds in and around fields, particularly wild crucifers, which may harbor fungal diseases. Leaf spot diseases may develop during periods favorable for infection in spite of these preventive practices. A fungicide spray program is the only effective method of control. Fungicides should be applied according to label directions and repeated if conditions favorable for infection persist. If possible, anticipate disease problems and begin a spray schedule before economic damage occurs. Consult the Extension Agents Handbook of Insect, Disease and Weed Control (Extension Circular E-832) for more information on fungicides currently registered for disease control on leafy greens.