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Septoria Leaf Spot
One of the most common tomato ailments, Septoria Leaf spot is caused by a fungus which weakens the plant and makes fruit susceptible to sunscald. Symptoms first appear as small, water-soaked spots. Eventually the lesions overtake the leaf. Small black fruiting structures can be seen at the center of the lesion if viewed through a good magnifying glass. Septoria can be effectively controlled using fungicides sch as Chlorothalonil.