If the link doesn't work Google > saponin nematicide Monterey

Here is a link that might be useful: Saponin nematicide

Have not heard of it. Does this target only parasitic nematodes or all nematodes? Is this product only for use in certain areas where these nematodes seem to be a problem?
I would rather not take the manufacturers and sellers word that this is a good, safe, product.

From a post on the Soils forum where I touched on this (I would link the whole post, but my reply was the only one).

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Soapbark (Quillaja saponaria) extract nematode control effectiveness has been all over the place, but it seems to work best in well drained or sandy soils based on where the positive reports come from.

The big problem is it's found to be great in one study, mediocre in another, and nearly ineffective in another...but the potted plant, grape, and stone-fruit industries have reported good results.

I'd probably be inclined to trust EPA that it's safe enough, but not the manufacturer that it's effective.

Even if just for potted plants, grapes, and stone-fruits it would be a help.

I have a one root-knot nematode-infested fig in a 25 gallon pot I might try it on.

Wow!,....the technique I have been posting for many years here on GW to control nematodes, especially root-knot nematodes, now has an official name and patent. Soap as a surfactant, (not always needed) and just plain sugar...all gussied up with a few unnecessary additions, in an expensive 'organic' package.

Let's cut to the chase. I have years of first hand experiments with this subject treating infected lawns and gardens. Granulated sugar, all by itself, spread on infected soils and lawns every eight weeks during the growing season provides satisfactory control. The only time a surfactant is needed would be when the soil was tight and not friable. This would be applied with a hose end sprayer after the dry sugar was spread. (Fill sprayer with liquid organic soap, set sprayer dial to 1 tablespoon per gallon.)

Yes, I know that using granulated sugar is expensive. However, dry molasses can be purchased at a reasonable price in #40 bags at farm stores. Substitute this when treating large areas.

To control root-knot nematodes when planting root crops work sugar and cheap, fresh unused coffee grounds into each planting furrow before seeding. Every 4th week scratch additional sugar along each row until harvest.

Gonebananas will find that 3 handfuls of sugar worked into pot surface soil every eight weeks for a growing season worth trying.

Thanks. I'll try the sugar first. I had read of that method years ago (maybe your post) but never tried it. I also noticed the cheap dried molasses feed in a feedstore and thought immediately of this use, but again, never got around to it. I probably had no specific known problem back then.

Keep in mind that the EPA, as do all of the regulatory agencies today, relies on the manufacturer supplied information to determine if a product is "safe". What the EPA, or any of the other regulatory agencies, might tell you about the safety of any product is no more reliable then what the manufacturer does.