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Powdery Mildew is a common rose fungus that shows up as a coating of white powder on leaves and twigs. It is caused by nighttime humidity. The condition is worse when there is no rain or humidity in the daytime to wash away that dew.

To fight powdery mildew, be sure to plant your roses far enough apart that wind and sun can get into the leaves and keep them dry. Be sure they get enough sunlight as well.

There are several fungicides that work against powdery mildew - read the labels and use appropriately.