Late Blight of tomato

"Leaf symptoms of late blight first appear as small, water-soaked areas that rapidly enlarge to form purple-brown, oily-appearing blotches. On the lower side of leaves, rings of grayish white mycelium and spore-forming structures may appear around the blotches. Entire leaves die and infections quickly spread to petioles and young stems. Infected fruit turn brown but remain firm unless infected by secondary decay organisms; symptoms usually begin on the shoulders of the fruit because spores land on fruit from above."

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Presence among species

AgentsSusceptible host
Phytophthora infestansSolanum demissum
Phytophthora infestansSolanum tuberosum (Pythozome V13)
Phytophthora infestansSolanum bulbocastanum