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Could be too soaked. The only other off the wall idea I have you won't see unless it gets dug up. In my case it's everything except the most vigorous that comes from weeks. It's a plug fabric thing that the cuttings come in. I have had it happen on several roses. Solero was the first. Each year of 3 years it looked worse until I suddenly decided to give a pull by hand. The whole rose pulled out of the ground. The soils in Texas are vastly different from ours. I forgot to take it out of the soil it came in and the roots never grew out of it. My fault but here is the result. Here is all the roots that I had What I have to do is make sure I remove almost all of the soil they come in. This is true of several nurseries I order from. It is replanted now free of the soil and fabric wrap that does not break down here. Will update next year when I see how it does in my soil. Not saying it is your problem just adding a possibility.

Hi Dave, Thank for this. I did the second option with re-potting, though I lightly pulled apart the roots and removed excess soil, then added new mix at the bottom and then filled in around the three plants as I went up. I don't exactly follow why this would be the cause? Are schefflera very sensitive to re-potting? I definitely haven't overwatered. I examined the plant and its roots yesterday and the soil is very dry. Fungus gnats are a constant problem in the Netherlands and I have some ferns also in the house that prefer to stay moist so it is a challenge to get rid of the gnats entirely. As to the sand, I'm surprised to hear this, though maybe I've been doing things wrong for a long time. Strangely in the Netherlands bagged potting soil doesn't contain vermiculite or other materials to lighten it, so I have generally amended with sand to improve drainage, and also placed clay balls in a two inch layer at the bottom of pots to help with drainage. Anyway, please let me know what you would advise now? Thanks! Oh, also, the plant was repotted two weeks ago, but only starting going down hill maybe a week ago, though I guess it could be that the first lesion started sooner and I didn't notice it.