I've got a mandevilla vine that I've recently brought indoors for the fall/winter. We're in a zone 7/8 area (southwestern B.C., Canada). The temperatures have been dipping to about 40°F overnight. Since I've brought it in, the leaves and flowers have been falling off, some of the leaves are turning yellow, others have black areas on them. I'm unable to find any kind of bugs on the plant. It was in a semi-shaded area in the house and I've just moved it to a brighter spot. Does anyone have any ideas about what might be wrong?
Thanks in advance, Brenda