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OrganicOzarks
All due respect but nematodes are not the only thing that works. I know for a 100% fact that a layer of perlite on top of the soil for about 2 weeks stops the little fuckers. Im assuming sand would do the same thing. I did the perlite on soil trick with a few yellow sticky traps to catch the flying adults and within 2 weeks a medium size infestation was completely gone. Its a bit of a hastle scooping the perlite off every few days to water but its only for 2 weeks max then u can remove it.
Neem oil definitely does not do shit neither does pyrethum u have to stop the breeding cycle by stopping them getting to the soil and laying their eggs. Ive never used it but i would imagine DE does work very well also.
Like i said im not hating on the nematodes lol.. but there are other methods that do also work
peace
BlazingSaddles
Perlite on the top of the soil was the first thing that I tried. It didn't do shit but make a mess. I would never suggest to anyone to ever try that method. It was a complete nightmare.