The picture of a dendrobium below is as close as I can get to the leaves but it still doesn’t show the tiny, slightly yellowish/clearish pests on the leaves. With a 30X lope I can see the critters but just barely – they must be the size of a straight pin point and I believe the white stippling is an aftermath of the pest activity and it is pretty bad on two dends. The stippling is on both the top and bottom of the leaf but much worse on the bottom. I tried using a q-tip dipped in alcohol to get rid of some of the stippling but no deal. I also found several dry black splotches within the white stippling and one (fresh?) super tiny shiny black bubble that reminded me of a tiny drop of old used motor oil – absolutely black. No webbing but from some internet searching I’m suspecting that these tiny critters are mites, possibly flat mites.
I have all my orchids in a lath house and even with fans and misting it gets pretty warm in there and I can only maintain about a 40 percent humidity. Never had to deal with this problem before and have read many sites that suggest miticides, oils, and/or insecticidal soaps. I’m leaning toward the insecticidal soap.
Before starting to spray, or to chop, or to throw away I would like suggestions as to what to do from somebody who had dealt with these critters before.
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