You might have powdery mildew. I use a baking soda solution to treat it; some people use milk.
You need to watch your other plants as it can spread. Make sure they have good ventilation.

Thanks for the information. I will try the milk. I had an ant problem next to the vine and went out and placed ant traps...........the ants are now gone and I am wondering if they were keeping the vine clear of disease??? Lesson learnt is one should never mess with mother nature

winniethepooh65, I read an article regarding powdery mildew on mangoÂs in the California Rare Fruit Growers magazine, & I thought I would pass it along. It said skim milk should be used  1 park milk to 9 parts water as a weekly spray. The low fat content of the milk reduces odor. If the concentration is above 3 parts milk, another fungus can grow on the plants. Other recommendations in included the baking soda & sulfur sprays.