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Abgeschickt von Alastair Robinson am 30 Maerz, 2000 um 12:04:58
Antwort auf: Question regarding pot culture von Jim Bestmann am 30 Maerz, 2000 um 10:49:35:
While I am not certain about the link between root rot and the pH of your water, I can tell you that damping off (Phytophthora spp.) isn't greatly affected by pH, though some claim that it is limited under more acid conditions. A variety of factors do affect this fungus, including the type of soil used and consequently its constitutive microflora. There probably isn't much that you can do about the latter point, but ventilation and the use of a soil lightened with a substrate such as perlite may well help you.
If you aren't averse to using them, a dilute fungicide will eliminate this problem, though you should be careful over which types you use. I never use them myself, and so I have no knowledge of which types orchids such as Cypripedium are sensitive to.
If you feel the need to reduce the pH of your water inexpensively, you can leave some standing in a large bucket to which you have added a cupful of moss peat, or even vinegar (though the smell is detectable even when diluted significantly).
Best of luck,