My son and DIL gave me a mandevilla for mother's day. It had a few dark spots on the ends of the leaves which eventually spread and I ended up cutting it way back to get rid of the damaged leaves. It started with a bunch of new leaves and I was hoping it was going to make a recovery. I had it out on the porch when it was warm but I've had it in the house at night bc the weather has been nuts here. In the 40's in PA at night...We just had a get together here Sunday and the plant was outside and it looked great. TWO days later and I've got this... The only thing I can think of is that it rained hard here yesterday and it was on the porch. Is it maybe a fungus in the soil that probably splashed up on the leaves? It rained really hard here. There was NO brown or black on the leaves on Sunday. What do I do now?