I used Allude (same as Agri Fos) at a very non- green place as a foliar spray for a bunch of things and a soil drench on cuttings.
From epa website:
"Phosphorous acid is not a naturally occurring substance and has a mixed mode of action involving direct toxicity to the plant pathogen, aided by natural plant defenses. Therefore, phosphorous acid is not classified as a biochemical. However, these simple inorganic chemicals are amenable to structure-activity relationship analysis and for regulatory purposes these are subject to a reduced set of data requirements akin to those established for biochemical pesticides."
So I guess this would fall into a category similar to natural and synthetic pyrethrins.
From that quote it sounds like the myco (if colonization is successful) should help the plant build resistance similar to the action of the chemical. Or do I have that backwards and waaay oversimplified it? Anyway, I would think any fungus would be screaming.
Another article:
www.agriinfotech.com/.../POTASSIUM%20PHOSPHITE_briefnote.pdf
Cool, now I know more about this chemical than when I actually used it.
