I've hear some good things about using hydrogen peroxide in a foliar spray but don't know what dilution rate to use. Does anyone out there have experience using it? I've got the industrial strength 35% H2O2 as well as the 3% drug store stuff. How did you use it? Is it good for general usage on healthy plants or more for knocking back powdery mildew, mites and other nasty stuff? Do you need to let it sit for awhile before using it? Thanks!