Traci - I use overnight soaking in extreme cases only, but that does nothing damaging to the plant.
If you are using the Inocucor product as a curative treatment, mix up a 2% solution (5 tablespoons/per gallon). If it is a bare-root plant, completely immerse the plant in the solution for a couple of hours, or more. If it's a potted plant, drench the potting medium with it, and spray the leaves a couple times a day for about a week, wetting all surfaces. The idea is to get the beneficial microorganisms to populate both the potting medium and the plant, so the more the exposure, the better.
After that, and for routine probiotic use, a 1% solution applied monthly - again saturating the potting medium and wetting the plant surfaces completely - seems to be a good regimen to keep the populations active.
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Carolla, I agree with you.
I have used bleach, or Physan in water as a general disinfectant/algaecide for years, but the stabilized H2O2 product has shown absolutely no phytotoxicity whatsoever. I keep a spray bottle handy to use as a disinfectant in the potting area - I even use it to clean my hands.
As to the biological products, I have begun to use them and botanical-based treatments more and more.
The guy that's the VP of sales for Inocucor sent me some samples to play with, and I was unimpressed at first - it's hard to see "protection" from a disease - but after my erwinia situation, I was sold. I even rescued a 50-foot tall American Ash tree in my yard that had a fungal infection of its root system that caused it to lose all of its leaves. I poured the solution all around it last fall and this spring, and it's back!
Another example: we routinely put New Guinea impatiens in our front flower beds, and every year they succumb to some sort of rot. If we're lucky, they come back later in the summer. Last year, on a lark, I sprayed each plant once with a 1% solution after planting, and we saw no rot whatsoever. I now do that with all of our plantings.
More recently, I began using BotaniGard ES - it contains a fungus that attacks eggs and immature insects and mites. It has a slightly musty smell, but is safe in the home, and best I can tell, is really quite effective about the mealy bugs I imported.