Dendrobiums need your help!
Hello,
I noticed some spots on the leaves of some dendrobiums I have - they look as if some black liquid were spread on the back of the leaves. The spots don't seem oily and, at first, I didn't take them too seriously either.
But it is! To the one which suffered the toughest attack (a nobile-type hybrid), it begins to spread towards the pseudobulbs, as you can see in the images below.
I think it could be some fungus, but I have no idea what type and/or how to get rid of it. Other 9 or 10 dendrobiums have it (and one hybrid cattleya), but it only begins now: the leaves begin getting "dirty", but not the PBs for now. It's strange, because the affected leaves are not falling. They stay attached and with this type of spots that cover them more and more.
The infected plants got isolated, but I am not sure that I was in time to avoid further propagation.
What do you think it could be? And how could I treat those poor plants? Are they treatable or should I throw away all the plants that have it?
Should I spray all my plants with some fungicide? What type?
Thank you in advance,
O.
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