Five years or so ago, root knot nematodes made a major appearance in my carrot patch. I used the French marigolds the next year with chicken litter and crushed crab shell. Not sure why chicken litter is supposed to work, but the crab shell is composed of mostly chitin. Root knot nematode eggs have chitin in their shell so anything that encourages chitin eating organisms is bad for their eggs. That bed is fine now.
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