Answer: It sounds like you've prepared the soil well and given your tomatoes a good start. However, your plants may be succumbing to a fungal disease. Fusarium wilt, a problem in the south, causes plants to droop and the older leaves to turn yellow and drop off. There is no cure for the infected plants. Wet conditions promote other fungus infections, such as southern blight, in which the plants wilt and the stem at the soil line shows a brown, soft rot. This disease can be prevented by wrapping a tomato stem with aluminum foil when you plant so that 2 inches of the foil is below ground and 2 inches extends above ground. Unfortunately, there's no cure for this one either. Disease-resistant tomato varieties are available and you still have plenty of time to replant with such varieties if necessary.
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