Root- Knot Nematode

My eggplants and tomatillos have been looking pretty rough lately, so I pulled them up, and as you can tell by the photos it's root-knot nematodes. ( I had really been looking forward to those purple tomatillos ) I had some problems with the winter garden and I used a product made from chitin and right before planting this spring I applied it again. So I don't know ....... I'm going to plant some marigolds around the garden and see if that might help some. If nothing else, it'll bring some pretty colors to the vegetable beds.