This is the blight that caused the Great Potato Famine of the 1840s and will quickly infect any potatoes planted nearby. Infected fruits show brown, crusty patches and rot quickly. It attacks in rainy weather with cool nights and quickly infects fruits. Pale green, water soaked spots on the leaves quickly grow into purplish-black lesions and stems turn black. Late blight is the least common blight on tomatoes, but it is, by far, the most destructive. To prevent tomato blight from invading next year’s crop, burn everything the fungus may have touched including fruit and foliage. Because the crop is almost ready for picking, this may be the most disappointing tomato blight. Black spots on the almost ripened fruit turn into large bruised spots and the fruit begins to fall. Rings resembling targets develop first on the leaves and cankers soon grow on the stems. Solutions to the problem include watering only at the base of plants, and avoiding the garden while foliage is wet.Įarly blight appears after heavy fruit set. Overall, it is the least harmful tomato blight. While fruits may remain uninfected, the leaf loss can affect yield as well as exposing the fruit to sunscald. It usually appears at the end of July with small black or brown marks on the lower leaves. Septoria blight, also called leaf spot, is the most common blight on tomatoes. What is tomato blight? It’s actually three different fungi that attack tomatoes in three different ways at three different times. What is tomato blight? Blight on tomatoes is caused by a fungal infection and like all fungi, they are spread by spores and require damp, warm weather conditions to flourish.
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