Diseased Hydrangeas?

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HydrangeaBlue Columbus, OH(Zone 5a) Aug 03, 2001

My hydrangea's leaves have a white substance on them, kind of powdery. Is this a fungus/disease? If it's a fungus, I have a fungicide/insecticide/miticide spray that I've been using on my roses for black spot - should I use this on the hydrangea as well?

One last question... one of my other hydrangea's leaves are getting all brown and dried-like. I've been watering it constantly, and the new leaves that come out look good for a while, then they too turn brown. It's in full sun...but growing up we always had our hydrangeas in full sun and they did fine. I'm not sure what to do! Please help!!!
THANKS!

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