If you're talking about plants, I think the amount depends on the plant and the pest. Applying anything, even DE, is the last resort for me. I usually try to give the natural predators time to take care of the problem but if they don't or if I'm running a risk of losing a plant I just take a handful of DE and coat the plat with it. If it just a small portion of the plant that's being infestated, I may just coat that part. To me it's pretty unscientific but it works.
_________________ Sandi Texas Certified Nursery Professional Texas Master Naturalist Organic gardener Tree-Hugger Native Texan
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