Six years ago I got a piece of German Ivy from my Grandmother and put it into a cup of water to root. Every year, before the fall I take a clipping or two off of my plant and bring it inside to root and grow indoors, then put it out in the spring again. I've never had any problems with any of my plants until now. My Ivy is growing like CRAZY this year, and over the last week, I have notice these spots on the leaves appearing. I assumed it was bugs, only problem is, I can't find any bugs!!!! What do you guys think it is??