irie-i, i have been spraying 3% H2O2 due to some kind of bug problem, caught it early.
although i mix the 3% oxygenated water in the following ratio: 3 parts water, 1 part 3% H2O2 . i spray each plant very well, reaching under the leaves, the stalks, the main stalk, etc... the plants give off a nice smell during this process btw.
been doing it three days in a row, the first day i did one sprayed, the second and third did two sprays. looking good so far. most bugs already gone. and the plants are far into flowering already.
i am a believer
i think today i will do a last spraying and then in a couple of days see what is up. maybe spray them with plain water to wash off any excess h2o2.
peace and good luck.