![]() ![]() Edward Sikora, Auburn University, Ĭool and moist weather arriving later in the season favors the development and often rapid spread of late blight. Late Blight ( Phytophthora infestans) Late blight ( Phytophthora infestans). As with early blight, the lower leaves are affected first. The lesions caused by Septoria are consistently small, circular, and tan to grey with a dark brown margin. Septoria leaf spot is a fungal disease that often occurs simultaneously with early blight. Septoria Leaf Spot ( Septoria lycopersici) Septoria leaf spot ( Septoria lycopersici). Subsequently, lesions develop concentric rings in a distinctive, bullseye pattern. ![]() The infection first appears on older foliage as small black to brown spots. It is a fungal disease that causes symptoms on foliage, stems, and fruit, often beginning when the plant is flowering. Gerald Holmes, California Polytechnic State University at San Luis Obispo, Įarly blight is one of the most common diseases of tomatoes. Early Blight ( Alternaria solani) Early blight ( Alternaria solani). In addition, being alert to where and when the disease is present and what conditions favor its development is invaluable. Although conclusive identification of a pathogen requires diagnostic lab confirmation, some clues can point to the correct diagnosis. ![]() In order of occurrence, the most common diseases are: early blight, late blight, Anthracnose, and Septoria leaf spot. Preventing tomato diseases can begin with choosing high-quality, disease free seeds, or disease resistant tomato cultivars. In choosing seeds, however, it’s worthwhile to pause and consider the obstacles nature may throw at us, including common tomato diseases. Come February, we linger over seed catalogs, carefully choosing which to start. Every winter, backyard gardeners have dreams of lush, ripe, disease-free tomatoes. ![]()
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