The product which is used medically is called Onychol. Its for skin fungi. Its made from ground up grapefruit seeds (which do not get mouldy). The way it would be applied would be to actually spray the plants with it rather than have it absorbed. It was originally invented to treat fungi in fish hatcheries where they needed a non toxic product. It worked and has since been modified for the medical market.
I spoke with the ceo of the company last weekend. He is interested in doing some research on his product (its not GSE) to see if it would help us gardeners. Other than for myself I don't know who to recommend. He would prepare a special form of it for gardeners to test.
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