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Bad news Istvan, another of those "bloom and bust" episodes? I do believe that somehow there is something we can do to improve this thing. I have just discovered a similar incident with my gorgeous sanderianumxmoquettanum (it is really great). Yesterday I had to remove a leaf orange and smelly from probably phytophora. I drowned the scar in dragons blood it normally helps. Just hope it stops this s¤%t.
I think this orange smelly patch at base is Erwinia. ( phytophtora causes brown rot). The problem with this that there is no way to save plant, all of my paph what got it, died within few days. And there is no warning sign at all. My sanderianum was a very strong plant with many new roots, just before forming its new flower sheath and died within 3 days ( Erwinia rot begins at base and spreads inwards very rapidly). As I see it I removed involved leaf immedialely, next day two another ones began to rot, I removed them, too, and rot reached the center of base on the next day. Despite of drier conditions, fans, cinnamon and chemicals. I tried with Amistar before, when another plants were sick, there were no effect on problem.(Amistar is a wide spectral fungicide, that is why I think this problem is caused not by fungi) Only good way, I think, I got this tip, is prevention. I spoke with an excellent grower/seller , he said that he uses diluted peroxide for watering, once/month, he dilutes 3% peroxide to quarter and while he does that, he has no problem with rot.