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Holes in Knock Out Rose Leaves—Safer’s Spray for Chewing Insects

Leaf holes with no visible bugs = chewing insects (beetles, caterpillars, sawfly). Use Safer’s Rose & Garden Spray (pyrethrin + insecticidal soap) — effective, low toxicity. Spray undersides; repeat in 7 days.

Roses: Rose Slug (Sawfly) Damage: Identification and Control; Pruning Knock Out Roses for Winter: Height, Timing, and Hedge Trimmer Technique; Restoring Bloom Size on Double Knock Out Roses: Pruning Frequency and Fertilization Schedule; Transplanting Knock Out Roses in Zone 5: Fall vs. Spring Timing; Pink Knockout White Spots = Mildew (Not the Common Kind) + Basal Canes Are Normal; Knock Out Rose Buds Drying Up: Rose Midge Infestation; New Knock Out Rose Declining After Bayer Granules: Chemical Sensitivity; Fire Blight on Knock Out Rose: Identification and Control; New Knockout Roses: Purple Leaves and No Blooms – Transplant Sulk; Powdery Mildew on New Knock Out Roses in Tampa: Treat, Don't Return

Garden Articles

Sudden Death of Established Knock Out Roses in Florida

Treating Powdery Mildew on Knockout Roses with Baking Soda

Pruning Leggy Knock Out Roses for a Compact Shape

Combating Rose Slugs on Knock Out Roses: Effective Treatments and Timing

Double Knockout Roses Reacting Badly to Systemic Spray? Try a Chemical Break

Planting Knockout Roses Closer Than Recommended: Pruning Makes It Work

Bare Root Roses Not Leafing Out – What to Do

Plants

Saving Knock Out Roses from Japanese Beetle Damage in Hot Weather

Pruning Double Knock Out Roses in a Mild Winter: Staged Approach

Container Knockout Roses Losing Leaves: Heat Stress and Recovery

Finding Knock Out Roses in Montreal by Late July

Knock Out Rose Winter Protection in NE Pennsylvania Zone 5/6

Knock Out Roses Not Blooming? Deadhead, Prune, and Feed Potassium

Rose Rosette Disease: Why Knock Out Roses Aren't the Only Victims