Late blight is caused by the pathogen Phytophthora infestans, often occurring in tomatoes and potatoes. Typical symptoms are water-soaked gray-green spots on older leaves, large brown blotches on leaves, dry brown foliage, and dark brown spots on fruits.
Signs of damage:
When late blight infects stems, everything above the infection site dies. Infected tomato fruits develop rough, leathery spots or dark, water-soaked areas that rot rapidly. Potato tubers bear dark, irregular spots on the surface and reddish-brown spots that extend down into the flesh. Decay continues after harvest.
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