(Source: Cornell Vegetable Website). : Figure 7: Shoot blight on aspen showing black and curled stem. Symptoms of Septoria leaf spot first appear at the base of affected plants, where small (approximately ¼ inch diameter) spots appear on leaves and stems. Fungal spots, blights, and blotches. What does Septoria leaf spot look like? These spots are smaller and more numerous than those of early blight. Septoria leaf spot, also known as septoria blight is a common disease of the tomato plant, which also affects other members of the plant family Solanaceae, namely potatoes and eggplant. Septoria tritici blotch (also known as speckled leaf spot), Stagonospora nodorum blotch and tan spot (also known as yellow leaf spot) are the three most frequently occurring leaf blotch diseases of wheat in Ohio. 0000003956 00000 n Septoria brown spot lesions on soybean leaves. Early blight and Septoria leaf spot are fairly easy to distinguish from one another in the field. 26th TDW Ithaca, NY - Oct 12, 2011 . Disease cycle of septoria leaf spot Septoria blight and early blight both overwinter on infected debris from previous years. Early blight appears mainly on older leaves at the base of the plant as yellow spots which later turns into dark brown spots. Early blight, caused by the fungus Alternaria solani, can also infect eggplant. Information is given about Septoria leaf spot (Septoria lycopersici) and early blight (Alternaria solani), fungal diseases of tomato [Solanum lycopersicum]. 0000048155 00000 n Martha A. Mutschler. Early Blight and Septoria Leaf Spot are an annual occurrence in tomato fields, greenhouses, and high tunnels. Cover the ground beneath your tomato plants with mulch, plastic or landscape fabric. The spots are smaller, and more numerous appearing on the upper leaf surfaces. Tiny black specks, which are fruiting structures that release spores, develop in the center of these spots. I've also seen a couple of patches of early blight, but the septoria is doing the majority of the damage because of its early start. 0000068953 00000 n Martha A. Mutschler. I saw multiple articles that discussed two different diseases, both common and commonly mistaken for each other. Septoria leaf spot usually begins in damp, cool weather and one strategy to beat it is to plant your tomatoes LATER in the season when it's warmer. They’re each caused by different funguses. 0000005302 00000 n Spots may reach 1/8 inch in diameter and be surrounded by a yellow halo. Early blight appears mainly on older leaves at the base of the plant as yellow spots which later turns into dark brown spots. A cover helps prevent the spread of fungus from the soil to your plants. 0000003246 00000 n Cercospora early blight and Septoria late blight often weaken the leaves and petioles of celery and reduce the marketability of the crop. Leaf spots begin as yellow areas that later become circular with gray centers and dark borders. There is no reported resistance to Septoria leaf spot. Early Blight: Late Blight: Tomato Leaf Spot: Responsible Fungus: Alternaria solani : Phytophthora infestans: Septoria lycopersici: Description of Foliar Damage: One or two spots per leaf, approximately ¼ to ½ inch in diameter. The most important diagnostic feature of early blight is the formation of dark, concentric rings within the lesion, giving the spots a target-like appearance. Early Blight Septoria Green Doctors Frosted X Jasper F1 X X Matt's Wild (Heirloom) X Mt. Image: A. Robertson . Period of Activity Early blight overwinters in infected crop residue and can be carried by infected seed and weed hosts. Septoria leaf spot, caused by the fungus Septoria lycopersici, is sometimes mistaken for early blight in tomatoes – and vice versa. Both early blight and Septoria leaf spot are potentially serious diseases that affect the leaves, stems, and fruit of tomatoes. 0000007159 00000 n Early blight is caused by the fungus, Alternaria solani, and septoria leaf spot is caused by Septoria lycopersici. 0000042023 00000 n Septoria brown spot lesions on soybean leaves. Improve the fertility of the soil to encourage growth of vigorous plants. Disease cycle of septoria leaf spot Septoria blight and early blight both overwinter on infected debris from previous years. Early blight results in the formation of irregular, brown leaf lesions or spots that range in size up to ½ inch diameter. Leaf spots are classically thought of as tan to brown, local lesions with distinct borders or delimited borders on leaves or flower parts. 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