Anyone knows what are the white spots on my Azaleas and Irises

Thanks, I am going to give it a try.

Does it look like someone took powdered milk and splashed it on the plants and then it dried? If that is what it looks like then it is definitely a fungus. Hopefully a spray will take care of it. I own a landscaping company and what I encounter in my area the most are Azaleas, Rhododendrons, Mt. Laurels, Dogwoods and Roses with this problem. But I am sure the Iris is a potential candidate. If you have to resort to the systemic fungicide DO NOT use it around stuff you are going to eat like tomato plants, peppers, lettuce, etc...