Quote:
Originally Posted by sskmaestro
Have a question.
Does the 2% hydrogen peroxide kill the young roots ? (These roots are way too young)
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I never use the stuff myself, but others have suggested that it damages roots. Roots, especially newly-developing ones, have microscopic hairs, and I would think those would be quite vulnerable because they have very high surface area, and they're fragile. Physan is pretty benign, and worth spraying on areas that show rot. Generally, I just rinse off the icky stuff with the hose, and then pot into fresh bark. I have found that damaged areas dry up, and I don't have to do anything more than that. Also, if there are roots that have lost their velamin but are firmly attached, I leave them. I don't know how efficient they are at hydrating the plant (they may do a little) but they do serve to anchor the newly-repotted plant. That's vital, since new roots do have those fragile tips, and any wobbling can damage them.
Some people on the Board also use systemic fungicides... again I have not found a need for them. Now, in fairness, I mostly grow outside, where air exchange is essentially infinite. (I do have a small greenhouse, but it is far from air-tight, and it doesn't need to be where I live) Treatments may be a lot more necessary in the confined space of a cold-climate greenhouse.