There is some speculation that the global spread of late blight today is due to seed potatoes. Did You Know? Saving your own seed potatoes can help prevent late blight from ending up in your soil. Much like early blight, late blight prefers damp weather and shows up as the temperatures begin to cool from mid to late-season each year. Cottony Mold – both the leaves and the fruit can develop a fuzzy ring of mold around the darkened spots.Suess book, the tomatoes can develop greasy, olive-green spots and eventually fall from the plant. Greasy-Greenish-Spots – like something out of a Dr.This blight moves fast and can completely defoliate a plant in about two weeks. Blue-Gray Spots – leaves will show spots that start out as a blue-gray color and turn brown before falling off.Identifying Late Blight Notice the yellow tinge around the outer edge of the brown spot. Late blight is really tricky to deal with as it spreads in the soil via infected plants and potatoes and spores floating in the air. Phytophthora infestans were originally thought to be fungus but have since been reclassified as a water mold or oomycete. It infects tomatoes and potatoes and was responsible for the horrific Irish potato famine in the mid-1800s. Brown or olive-green leathery patches show up on tomatoes infected with late blight. Its Latin name translates to Plant Destroyer, just to give you an idea of how nasty this stuff is. Late blight, or Phytophthora infestans, is a fascinating form of blight. They can also develop spots with the tell-tale bullseye. Dropped Fruit – Tomatoes usually fall off the plant.Sunken Stems – stems of the plants will also develop brown rings with the bullseye pattern.
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