Buy systemic fungicide/insecticide (e.g., Orthene) at nursery. Spray every 2 weeks per label. Remove all yellow/black-spotted leaves and fallen debris—trash them, don't compost.
Indoor Parade Rose Leaf Loss: Black Spot vs. Environmental Stress
Sunset Maple Leaf Spot: Cosmetic Fungus, No Treatment Needed
Oncidium Tiny Black Leaf Spots: Usually Harmless, Sometimes a Warning
Silvery Spots on Tea Rose Leaves = Rose Slugs (Sawfly Larvae)
Diagnosing Blackened Rose Leaves: Spray Damage or Nutrient Issue?
Black Leaf Spots on Corkscrew Willow: Late-Season Fungal Spots and Prevention
Diagnosing Abnormal Rose Leaves: Light Green, Narrow, Shriveled Clusters
Identifying and Treating Downy Mildew on New Rose Plants
Yellow Spots on Knockout Rose Leaves: Weather Stress, Not Disease
John F. Kennedy Rose Struggles with Black Spot in Arizona Heat
Knockout Rose Black Spot: Late Season Management in Zone 8
Black Spots on Philodendron Xanadu: Harmless or Scale Insects?
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