The leaves of potato and tomato plants are the first to show signs of the disease - shrivelling and turning brown. Keep an eye out for brown patches on new green tomatoes Image: Elena Masiutkina How to recognise potato and tomato blight However if the disease does find its way into your greenhouse, the humid conditions will cause it to spread and progress very quickly. Tomatoes grown in greenhouses are less susceptible. However if blight occurs after the potato tubers have set, harvesting your crop early can sometimes save it. Early attacks can ruin an entire potato crop as the leaves shrivel and die. Once the leaf tissue of a plant is infected, the disease spreads rapidly. The pathogen can overwinter in rotten potatoes that have been left in the ground, so grow bags are a great way to avoid this. It’s spread via wind-blown structures that release their spores into water, making the problem worse during wet and humid summers. Potato and tomato blight is a disease caused by a microscopic fungus-like organism. Potato blight can spread rapidly if left undetected Image: Thy Once infected, the entire plant may need to be removed, and carefully disposed of, to protect other plants from contagion. Late blight, a fungal infection more commonly known as potato and tomato blight, damages the leaves and crops of potato and tomato plants. Late blight can be devastating for tomatoes and potatoes Image: Radovan1 Garden diseases - Potato and tomato blight
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