Schefflera suddenly dying
First, I have a black thumb and have tried very hard to keep a few plants alive and healthy on my patio, which gets no direct sun and only has light shade. I have had a schefflera planted outside for two years. It has done quite well until recently. I was gone for a month and my husband cared for it and I think he watered it more often than he should have. The plant is dying from the top down. All the new shoots are turning black and drying out, and the leaves are drying out and dying. Under the leaves there appears to be white spots. I am not familiar with plant diseases so any suggestions as to the potential cause of the sudden downturn in the plants health is much appreciated.