I have an arbutus I transplanted from the road side into my yard 4yrs ago which has been doing very well as I planted it exactly like it was by the road..It was only 2 ft and now it is about 12ft tall. But this early spring and summer I noticed little spiders attacking it and used an organic pest control spray on it 2X and it seemed to work for the rest of the summer as no leaves fell, they looked nice and green, I didn't see many spiders etc. etc. My problem is we left for 2wks and the tree was fine before we left Sept 27-Oct 14th but when we got back the leaves are still green but all drooping! The smaller tree next to it ( about 3ft tall) isn't doing this but the large one is. It is heartbreaking to think we would lose this tree, could it be a frost while we were gone that would do this?