The standard hydrogen peroxide (3% I think) is really useful for crown rot or other types of rot. The effect of H2O2 is very short as it quickly decomposes into H2O and 02. When you pour some into a crown it will fizzle a bit, and after that, all you have left is water. It works on rot because it is a powerful oxydizer. What’s interesting to know is that plants actually produce H202 very locally to combat pathogens. If a plant recognizes that a pathogen has entered a cell, the cells initiated a hypersensitive response where H2O2 and other compounds will destroy the cell and invading microbe. It’s very effective.So all we do by applying it externally is mimic something the plant already does on a smaller scale.
As for using it for insects, I’ve never heard of it. I have heard of it being used as a drench to stimulate root growth (from the extra 02) and I know it's very effective in killing pathogens in the medium.
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