![]() ![]() Germination requires water and relatively warm temperatures. This sucks nutrients from the leaf and leads to yellowing in the surrounding area. The single spore leads to a visible colony (a black spot on the tomato leaf). The spores land on the leaf of a tomato plant and then germinate (become active and start to divide). solani) reproduces through spores that can survive through freezing and drying. Early blight typically hits in mid summer, while late blight hits toward the end of the growing season. It moves much faster and is famous for causing the Irish potato famine. Late tomato blight is caused by a completely different strain of fungi called Phytophthora infestans. The common name early blight is to distinguish it from the much more severe late tomato blight. ![]() It is best known for infecting tomatoes and potatoes. solani can also infect potatoes, peppers, and other members of the solanum genus, which includes the nightshade family. The Alternaria solani fungus primarily infects leaves and stems, but it can also infect the fruit. Early blight is caused by a fungal infection.It rained for about 5 days straight, and it was during this time that I trimmed the bottom leaves and inspected the top ones without washing my hands.īelow, I'll describe what I've learned about early tomato blight, its prevention, its treatment, and my own experimental prevention/treatment ideas. I also spent way too much time touching the leaves. I probably did a lot of things wrong that led to disease susceptibility: mainly, I encouraged my tomatoes to get bushy and grow upward in the confines of their cage, allowing all the leaves to touch. A little (a lot) internet research led me to a diagnosis as well as treatment options. I trimmed off all the bottom leaves and laughed at my top heavy plant.īut then, bam, the problems started spreading up the plant. After my vacation, some of the bottom leaves looked a little worse for wear. Really, they were green, bushy, and producing lots of new tomatoes. I was so excited with the progress of my tomatoes. ![]()
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