I gave up on growing them in south Florida's extreme nothing but sand soil. We are so infested you would need 100 marigolds per foot!
I now grow in pots with potting mix, not potting soil, and the thick plastic bag the potting mix came in is placed between the pot and the soil. It's a barrier to nematodes, they can't crawl into the pot through the drain holes because the plastic is there. Easy peasy, problem completely solved. My 47 Earthboxes have a solid bottom and the water drainage area is above ground,so nomorenematode issues. It turned my 3 month season into an 8-9 month one instantly.
The idea is: grow and don't let them in. Photo showing the barrier under the pot.
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