I forgot to add that I have tried soil solarization but gave up on that. It's a pain in the but and Lord knows how many good things in the soil it kills too. Besides, it will only solarize about the top 6-8" so if one tills or digs below that, nematodes are brought to the surface to start all over again. I use a 16" tine broadfork on the beds a lot so there goes the neighborhood!