Tomatoes and eggplants are in the same family (Solanaceae) with peppers, potatoes. Growing them in the same plot consecutively builds soil pathogens (early blight, Septoria, Fusarium, Alternaria). Rotation: never plant Solanaceae in same spot more than once every 3 years.
Ground cover mulch is not the problem—it prevents pathogen splash. Overhead watering wets leaves, promoting fungus. Switch to drip irrigation. Move Solanaceae to a new area; plant unrelated crops (beans, corn, brassicas) in old spot.
Resource: Yankee Gardener rotation chart, Texas A&M tomato problem solver.
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