Q: I have looked for Nemacide to no avail. Once upon a time it was easily purchased at any garden center but now it is gone.

A: Nemacide was used to control soil nematodes. Its no longer available due to toxicity issues. Unfortunately, there are no homeowner products registered for nematode control. The best strategy for control is to add organic matter to the soil to enhance the soil inhabitants that feed on nematodes.

see

Nematode – Control

and

Nematodes