Quote:
Originally Posted by aliceinwl
but roots shouldn’t be sprayed prophylactically. This seems to be a very popular treatment on the internet
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alice ------ I once sprayed all of my incoming mail order (catts) with H2O2 ..... leaves, roots and all. Lots of these orchids. It was 3% and 5% concentration.
I never had any fatalities. However...... and this is the big however ...... I do sense that these H2O2 root-treated plants all took a relatively long time to begin 'growing'. I do have some sort of feeling that the H2O2 made the plants take a while to get 'growing'. I'm thinking it's possible that the H2O2 will not just take out some fungus ----- but possibly also take out some beneficial organisms and even stunt root growth for a while.
So now, whenever I pot/repot most of my incoming plants (from the mail), I do not use H2O2 anymore. At least not on the roots. Instead, I just spray some mancozeb on the plant and the roots just prior to repotting.
Perhaps the concentration that swimmingorchids is using might be the key. I still keep fresh bottles (unopened) of 3% and 5% H2O2, but haven't used H202 for quite a while. Conditions over here are quite good - I haven't got issues with fungus.
But as for 0.3 percent concentration being effective on fungus. I definitely don't know. I'm just going to stick with manozeb, as that's what I've switched to. Reason is because once you open a bottle of H2O2, it begins to degrade.
Hybrid Mode
