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This is the only rust fungus that infects tomatoes. [2] Fungal infection manifests as greenish white spots a few millimeters wide on the undersides of a plant's leaves. The upper surfaces of the leaves may be dimpled as the lesions penetrate the blades. The lesions turn whitish with red to brown centers.
Rust fungi are highly specialized plant pathogens with several unique features. Taken as a group, rust fungi are diverse and affect many kinds of plants. However, each species has a range of hosts and cannot be transmitted to non-host plants. In addition, most rust fungi cannot be grown easily in pure culture.
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
Pests, herbicides, or environmental factors can all cause tomato leaves to curl. Learning to recognize the cause is the first step toward solving this common problem.
Tomato: Phytophthora infestans: late blight tomato yellow leaf curl virus (TYLCV) tomato yellow leaf curl Wheat: Fusarium graminearum: Fusarium head blight: Puccinia graminis: wheat stem rust: Puccinia striiformis: wheat yellow rust: Yam: Colletotrichum gloeosporioides: anthracnose yam mosaic virus (YMV) yam mosaic disease
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Septoria lycopersici infects the tomato leaves via the stomata and also by direct penetration of epidermal cells. [3] Symptoms generally include circular or angular lesions most commonly found on the older, lower leaves of the plant. [1] The lesions are generally 2–5 mm in diameter and have a greyish center with brown margins.