Just adding a few comments.
Jack noted that adding lots of organic matter helps, and it does b/c RKN's move from sand grain to sand grain via the watershell around each grain so the farther apart the grains are the less opportunity for RKN's to build up to destructive populations.
I have several TX friends who have tried the shrimp shell bit with no improvement. Ebon rye has been mentioned and two folks in CA have tried that with no luck, and it also takes the garden out of production for a season since that rye has to be grown then turned under.
About marigolds. Stokes introduced the Neemagon one which is slightly nemocidal as well as being a trap crop. But it's been shown that planting the Tagetes type marigolds, it doesn't have to be Neemagin specifically, doesn't work if planting them just casually, you have to plant the whole area and then till under which again takes the gardening area out of production for a season.
I've been posting online about gardening, tomatoes in particular, since the mid-80's and for those who live in areas where RKN's are a problem it's been a really sad story thru the years and many have had to go to continaer gardening.
N tolerant varieties, are just that, tolerant, not resistant, and that's fine for many commercial farmers who sometimes just need a week or more to get the Brix level up for harvesting, but not so much of a help to the home gardener.
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Carolyn
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