Now that the nighttime temperatures are in the 70’s, powdery mildew won't be a problem for your roses. Keeping the humidity up around your roses will discourage spider mites. You can do this by spraying off the roses each morning and keeping them well watered and mulched. If you need to spray for mites, you will need to use a miticide and NOT a pesticide. Information provided by the Rose Society of Tucson.
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