I have a sick tomato plant. I think it's probably early blight. The yellowing and dying leaves have started from the bottom of the plant and are working their way up. Most of the plant is pretty yellow-green now. Surrounding plants are starting to show some of the symptoms too. Should I just pull up the affected plant and spray surrounding plants with copper fungicide at this point? And do you think I'll be able to save the rest of my tomato plants? Will I need to continue to spray them with copper fungicide for the rest of the summer? Thanks!!
I wouldn't pull them up. Try to water without getting the foliage wet (soakers hoses are good), though I would do some foliar feeding by adding Garrett juice to undiluted hydrogen peroxide and spray that on the leaves. Peroxide is a good anti-fungal treatment. You might slow the progress of the yellow. There are a lot of other answers that will probably come along as well.
Trim off any yellowing branches. Copper fungicide is a good treatment for blight. Also, if you wanted to plant another tomato for a fall harvest, now is the time to do that. A few nurseries in Dallas have their fall crop tomatoes in right now.
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