Preventing Tomato Diseases Plant Pathology Preventing Tomato Diseases Septoria leaf spot and early blight are common fungal leaf diseases of tomato.
Cultural techniques can help reduce the risk of foliar blight outbreaks.
Water and fertilize to maintain plants in a vigorous condition. Avoid fluctuations of too much and too little water. Avoid wetting foliage when watering. If overhead irrigation is used, water early in the day so the leaves dry quickly. Do not work with plants when the foliage is wet.