Try this link, I think that there are only 200 or so plant including Nightshade plants like tomatoes, also Fig trees can be hurt by RKN. Clay soil & block walls make it hard for RKN. There is a predator Nematode that will help bring the RKN under control. Here is a link that might be useful: RKN resistant plants

Yes I have posted here several times about the excellent results I have had from using SF nems in eliminating the majority of my RKN problems (not to mention the elimination of many other soil-dwelling pests). But I will qualify that by saying I never grow carrots in that particular garden as they aren't a part of the rotation schedule for that garden. So I can't attest to the results of using them for that particular crop. There are many strains of beneficial nems but SF nems are the only ones that are consistently recommended for RKN. I also think it makes a difference where you order them from as my batch from GardensAlive appears to have been much more effective than the batch I ordered from another supplier. I'm not saying they are the only good source, just the one I used. But I'd recommend buying them from a fully reputable vendor only. Dave

Yes, all of the above should be of some help. However, I occasionally remind people of a simple, effective treatment learned many years ago. As a furrow/planting hole is made to plant beans, carrots, parsnips, tomatoes, etc. (either young plants or seeds) toss in handfuls of regular granulated sugar and plant as usual. For those with large gardens 40# bags of dried molasses can be substituted for granulated sugar. Available where horse feed is sold. This year we are trialing a dry molasses mix that has dried kale added. This is all that was available here. So far all plantings are healthy and repelling the RKN. For plants that take a bit of time to mature it would be wise to scratch in a sugar top dressing halfway through the growing season. There is still time in your zone to grow some other crops. Give this sugar method a try.

I had one tomato within a row of ok ones that looked like yours and also died. I haven't pulled it, but will (yes it is still there, bad I know). I've always wondered about nematodes, but never knew how to tell until I read this post and Googled. The deceased is Heinz 1431 from the Spring Fling. I did, however, plant "Nema-Gone" marigolds, of course in a different bed, from Baker Creek. I have no idea if/how/why those work. They are pretty though.