I tried it for a few years and wasn't sure whether it worked or not; but it didn't seem to affect my worm population. I found adding a lot of organic matter and mulching heavily helped more than anything. I even mulch my okra because it is very susceptible to nematode damage. Since I have been mulching heavily with cypress mulch I have noticed a big reduction in nematode damage to my squash and cucumbers but eventually they do usually have them late in the summer.
Bill
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