Don Juan climbing rose leaves have tiny holes.
Shot hole fungus (not insects). Common in wet, dull springs.
Any fungicide for rose black spot/rose fungus will control it.
Rose Bush Pruning: Dealing with Black Stems and Preventing Black Spot
Diagnosing Abnormal Rose Leaves: Light Green, Narrow, Shriveled Clusters
Heat-Stressed Rose in Colorado: Yellow Leaves, Brown Tips
Why Climbing Roses Drop Leaves After Spring Bloom: Common Causes and Fixes
Black Spot on Roses: Identification and Control
Carefree Rose Bush After Late Freeze – Scratch Test for Life
Rose Bushes Losing Leaves in Desert Heat: Stress, Sunburn, and Iron Issues
Butterfly Bush Lace-Like Leaves: Identify Damage Before Treating
Holes in Double Knockout Leaves: Don't Over-Prune!
Tiny Holes in New Knockout Rose Leaves: Chewing Insects
Identifying and Treating Downy Mildew on New Rose Plants
Mini Rose Stress from Environment Hopping: Indoor to Outdoor Transition
Rapid Defoliation: Caterpillars or Deer? Diagnosing Complete Leaf Loss on Roses
Newly Planted Rose Bush Turning Yellow? It's Likely Transplant Shock in Heat
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