Hi Diane,
You name this as a "trumpet vine" I usually think of that name as"trumpet creeper". It looks like Lonicera sempervirens, Trumpet coral honeysuckle? Can you check in the database on this site? I have photos of my plant posted. Just from the photos it's hard to tell- It does look a bit like powdery mildew. If your plant has the right conditions it should stay healthy. Since it's already established, maybe you should trim it down hard once it goes dormant and before the first frost. That might get rid of any virus or fungus. If its growing in a pot, it needs to have its roots trimmed every four or five years. I applied about a cup of organic bone meal to help mine with flowering. If there's sticky residue on it then there are aphids. Good luck!
