![]() ![]() Melanson, Mississippi State University Extension,, via CC BY-SA. It is often introduced into gardens via contaminated seed or transplants. Part of the reason that there is pretty much no escape from this fungus is that it overwinters in the soil and in infected plant debris. They can develop telltale symptoms on their cotyledons, and severely affected seedlings will die. The infection starts at the stem end and forms a leathery, dark, sunken area with – you guessed it – concentric rings.Įven seedlings are vulnerable. If the spots are near the ground, they can girdle the stems and prevent the plant from thriving by limiting the plant’s uptake of water and nutrients.īoth immature and mature fruit can be affected. As they grow in size, they will develop the same concentric markings that appear on the leaves. If the stems develop lesions, they will be slightly sunken. Your plants may lose a lot of their leaves, resulting in sun scald on the fruits. ![]() As they grow larger, they form concentric rings that resemble a bull’s-eye, and the rest of the leaf gradually turns yellow. This disease usually progresses from the bottom of the plant to the top. The first sign that your plants are infected with early blight is usually the appearance of dark brown spots on the lower leaves. You can learn more about various types of blights affecting tomatoes here. It is generally fatal to both tomatoes and potatoes it can spread for miles, and it was largely responsible for the death of one million Irish people (although the reasons for that famine were highly political and not just agricultural in nature). If you think early blight is bad, late blight is much worse. Late blight is caused by a fungus-like water mold, Phytophthora infestans. To avoid any potential confusion, I want to stress that early blight is not the same thing as late blight – the devastating disease responsible for the Irish potato famine. You may have also heard of a disease known as late blight. The tomatoes are still edible, particularly if the disease is mostly confined to the foliage. If you catch an outbreak early enough, you may be able to save your crop. The fungus overwinters in the soil, and spores can be spread by wind, water, insects, and even on your clothes or shoes. High humidity and temperatures above 75☏ cause it to spread rapidly. It can occur at any time during the growing season. Purge Nightshades and Volunteer Tomato PlantsĮarly blight is a fungal disease caused by Alternaria solani.Resistant Varieties Can Still Become Infected. ![]()
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