sooby said:Math is not my strong suit but I think that's a lot stronger than the dilution of UltraDawn used in the daylily rust study. That latter was 1%, am I right in calculating that 1:40 is 2.5%? Could be a difference in the concentration of the detergent itself maybe.
It is not mine, either. I just went by Ed Lawrence's 'recipe' and have not had any problems. I rinse it off just to be on the safe side. I have used it on a lot of house plants and outdoor plants for various insects, such as spider mites, scale, mealy bugs, earwigs.
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