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Septoria leaf spot of tomato: Fall 2013 Caused by the fungus Septoria lycopersici, is one of the most common and destructive diseases of tomato in Illinois. This disease has been observed in several tomato fields in Illinois. Symptoms usually appear on the lower leaves after the first fruit sets. Lesions also develop on stems, petioles, and the calyx. They appear as small, water-soaked spots that soon become circular, about 3 mm in diameter, with dark brown margins and tan to gray centers (see the photos below). The light-colored centers of the spots are the most distinctive symptom of Septoria leaf spot. When conditions are favorable, fungal fruiting bodies appear as tiny black specks in the centers of the spots. If the leaf lesions are numerous, infected leaves may wither. To manage Septoria leaf spot, a combination of cultural practices and fungicide use is necessary, including: (i) plant pathogen-free seed and disease-free seedlings; (ii) consider sufficient space between the plants for rapid drying; (iii) stake plants to improve air circulation and reduce the contact between foliage and soil; (iv) water the plants at the base, and in the morning; (v) avoid working with plants when foliage is wet; (vi) remove plant debris in the fall and plow under the remaining plant residue; (vii) rotate tomato with nonhost crops every three or four years; and (viii) spray plants with effective fungicides. See the 2013 Midwest Vegetable Production Guide for fungicides labeled for control of Septoria leaf spot of tomato. http://www.btny.purdue.edu/pubs/id/id-56/111_FruitingVeg.pdf University of Illinois College of Agricultural, Consumer & Environmental Sciences United States Department of Agriculture Local Extension Councils Cooperating University of Illinois Extension provides equal opportunities in programs and employment. Weekly applications of Quadris alternated with chlorothalonil (e.g., Bravo) effectively control Septoria leaf spot, early blight, and anthracnose of tomatoes in Illinois. Mohammad Babadoost (217-333-1523; babadoos@illinois University of Illinois College of Agricultural, Consumer & Environmental Sciences United States Department of Agriculture Local Extension Councils Cooperating University of Illinois Extension provides equal opportunities in programs and employment.