These above are signs of late blight in tomato plants - dark splotches on the stem and leaves, death of an entire stem. This disease is hard to prevent and hard to control but can cause the death of the entire plant before it comes to fruition. We were careful to not touch the plant with our gloves that would touch plants at other locations so as not to spread it, and washed our bare hands thoroughly after tying these up. Sometimes the plants can survive through the disease but if there are other plants that are not yet infected, it is best to pull the infected ones to prevent spread. Keep an eye out for these ominous splotches!
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