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LEE IN VA.
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That's too bad that your watermelon vines are dying. It looks like they were producing some nice melons. This is probably one of the fungal diseases; either Fusarium wilt or one that is generally called mature watermelon vine decline. Both are caused by soilborne fungal organisms. There is no fungicide that will prevent or cure this. Since the fungal pathogens are in the soil, it is very important that you rotate your crops. The fungi that cause both of these devastating diseases remain viable in the soil for several years so crop rotation and keeping the plants healthy with strong root systems are the best ways to help prevent their occurrence. Here is an interesting article from Purdue University that talks about these diseases in watermelons and some ways to distinguish the two: https://www.extension.purdue.edu/extmed ... P-65-W.pdf