8/28/2023 0 Comments Tomato leaf blight![]() ![]() These symptoms appear about 10 days after infection. Dark brown, sunken lesions form on stems and petioles. Elongated lesions develop on stems and petioles.Įarly blight appears as irregular, dark brown areas on the leaves with concentric, black rings developing into a target-like pattern as the spots enlarge. Septoria leaf spot begins as tiny black dots on the leaves, enlarging to small circular spots with a dark margin and gray center. Bacterial infections are spread primarily through rain splash and human activity. Fungal spores are spread during the growing season by wind, water and human activity. They all overwinter in the vegetable garden on infected plant debris. Septoria leaf spot and early blight are two common fungal leaf diseases, while bacterial leaf spot and speck are caused by bacteria. Severe foliage loss can lead to sunscald on developing tomatoes, which are suddenly exposed to more intense sunlight. If too many leaves are killed, then tomato production and quality will be affected. If foliage diseases are not controlled, they can lead to death of the plant. ![]() Loss of foliage due to disease, causes the tomato plant to be less productive or vigorous. Foliage diseases weaken infected plants by killing the leaves, which are the plant’s factories for carbohydrate and energy production. Tomatoes are attacked by both fungi and bacterial diseases that affect the leaves, petioles and stems, and cause blemishes on the fruits. Tomatoes are subject to many diseases, both leaf spots and wilts. Nothing is better than a home-grown, garden tomato, but growing tomatoes does have its pitfalls, including disease problems. Early blight appears as irregular, dark brown areas on the leaves with concentric, black rings developing into a target-like pattern as the spots enlarge. ![]()
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