When I first spotted nematodes in my garden, I decided to try
systemics. I have used Orthene, Orthinex and others with very
good (but never absoulote) results. I think
the best material has been the dry , granular systemic
chemicals. I have been using these twice or three times a season.
and once started, I couninur their use each year on a given plant. In
most cases, ( it has not seemed to work well on Gold Standard) the plants
"stay clean" That does not mean I hav eliminated them, only controlled
them. This kind of approach in very expensive for large scale use.
Some thoughts about nematodes...
I always wondered if systemic insecticides like Orthene and others wouldn't
also have some effect on nematodes.