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How to Identify, Treat, and Prevent Late Blight in Tomatoes
16.06.2023 - 03:35 / epicgardening.com
We’ve all heard about “the blight,” and some confusing and conflicting information exists. Does it live in the soil? Can you get it from your neighbor’s garden? Some say it moves up the coast during rainy periods and can travel miles in the wind. Is it a bacteria, a disease, or virus?
As with anything in gardening, it is important to understand what is happening and why so you can better understand how to treat and prevent it in the future.
Understanding late blight and how it spreads is key because it can devastate your tomato and potato crop very quickly if proper care is not taken. Here you’ll learn how to quickly diagnose, treat, and prevent tomato late blight.
Tomato blight (also called late blight because it occurs later in the season than “early blight”) is caused by the oomycete Phytophthora infestans, which have fungus-like qualities. This pathogen attacks tomatoes, potatoes, and other nightshade crops.
Oomycetes (organisms of the phylum Oomycota) used to be classified as a part of the Kingdom fungi due to their filamentous growth pattern and the fact that they feed on decaying matter.
However, after years of research and studies, it has been determined that these organisms are actually more closely related to algae and green plants. Oomycetes are now included in the kingdom Protista.
Oomycetes are also called “water molds,” which makes sense because they usually show up during extensive wet periods and travel in water. Other water molds include damping off, root rots, and downy mildew.
Late blight infects your plants through structures similar to spores. They spread by wind and rain. Simply put, oomycetes produce sporangia that look like brown spots on the leaves or petioles of tomato plants.
Zoospores are produced
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