Time to act:
Jun, Jul, Aug, Mar, Apr, May
Rose powdery mildew is a fungus that produces airborne spores from infected stems or buds on roses. After overwintering on your plants, the disease is most likely to flare up if the roots are in dry soil and the leaves are in humid air - conditions that are often found when plants are grown near or against a wall.
Leaves and buds on roses, possibly even stems and thorns, are covered by a dusting of white powder.
Find it on
roses - other powdery mildews affect other plants