Identifying late blight on tomato plants
Lesions develop on leaves and stems as dark, water-soaked spots. These spots enlarge until the entire leaf or stem turns brown and dies. Dead leaves typically remain attached to stems. The undersides of the lesions may be covered with a white fuzzy growth that contains the spores of the pathogen. On the stems, late blight lesions appear brown to almost black. Infected tomato fruits develop shiny, dark or olive-colored lesions which may cover large areas. Potato leaves and stems will show the same symptoms. Infected potato tubers develop a dry, corky rot that often shows up in storage.
They’ve also put together this video to help explain what late blight is, how to identify it, and what to do if your plants get infected.
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