![]() ![]() ![]() Infected tomato and potato plants often decline rapidly and die.Įarly foliage symptoms of late blight Late blight lesion on a tomato stem.When the infection is severe, a foul odor is produced in both crops. Infected potato tubers develop a dry, corky rot that often shows up in storage.Infected tomato fruits develop shiny, dark, or olive-colored lesions which may cover large areas.S tem lesions appear brown to almost black.Under favorable conditions, a white fuzzy mold will appear on leaf undersides that contain the spores of the pathogen.Dead leaves typically remain attached to stems. These spots enlarge until the entire leaf or stem turns brown and dies. Lesions develop on leaves and stems as dark, water-soaked spots.When plants are infected with late blight: Late blight is sometimes brought into the garden from infected transplants and seed potatoes. The most recent widespread infections in home gardens occurred in 19. Gardeners in cooler areas of Maryland are more likely to see late blight symptoms. ![]() The disease is slowed down by a return to hot, dry weather. Disease spores are spread short distances by rain and very long distances by wind. Late blight can occur at any time during the growing season when the weather is cool and wet. This is the same disease that caused the Irish potato famine in the 1840s. Late blight is a potentially destructive water mold or fungus-like disease that can affect tomatoes and potatoes in Maryland fields and gardens. What is late blight and how does it spread? If you suspect late blight on your tomato or potato plants, please submit close-up photos through the Ask Extension service.USABlight is a national project to monitor for late bright outbreaks.It can become active in cool, wet weather.The disease affects all parts of tomato and potato plants.Late blight (Phytophthora infestans) is the devastating water mold disease that caused the Irish potato famine in the 1840s. ![]()
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