Troubles in the Rose Garden: Common Rose Problems & How to Solve Them

There’s nothing quite as magical as a rose in full bloom—but anyone who grows roses knows that beauty doesn’t come without a few battles. From chewed leaves to mysterious spots, roses are magnets for pests and diseases. The number one questions I receive are on common rose problems, so I dedicated a post to try to answer most of them. If your rose bushes are struggling, don’t worry. Let’s dig into a few of the most common rose problems and how you can correct them organically or with minimal fuss.
 
Sawfly Larvae (a.k.a. Rose Slugs)

The Problem: You may first notice skeletonized leaves—paper-thin and translucent patches. That’s a clear sign of sawfly larvae feeding from underneath the leaf. These soft-bodied greenish worms (not actual slugs or caterpillars!) can defoliate a rose bush quickly.

The Solution:

• Handpick or rinse off with a strong spray of water.
• Apply neem oil or insecticidal soap early in the morning before the pollinators are out. I use Neem Max.
• For heavy infestations, a spinosad-based product is effective and safe for pollinators once dry. If need Captain Jacks Dead Bug. Again, it will kill all bugs so only use if necessary and early in the morning.

Black Spot Disease

The Problem: Circular black spots with yellow halos on leaves, eventually causing them to drop. Black spot is a fungal disease that thrives in wet, humid conditions.

The Solution:

• Prune out and discard infected leaves (never compost them).
• Improve air circulation by spacing and thinning plants.
• Use a fungicidal spray like copper or sulfur, and apply before rain or after watering. I use Captain Jacks Copper Fungicide.
• Water at the base of the plant—never overhead.
• Clean up all debris on the ground I use this rake.

Japanese Beetles

The Problem: Metallic green beetles that munch on flowers and leaves, often leaving behind lace-like damage.

The Solution:

• Handpick in the early morning when they’re sluggish.
• Drop them into a jar of soapy water.
• Avoid beetle traps—they often attract more beetles than they trap.
• Use neem oil or a botanical insecticide labeled for Japanese beetles.

Other Rose Troubles to Watch For:

• Aphids: Cluster on new growth; wash off with water or apply insecticidal soap.
• Powdery Mildew: White, powdery film on leaves; improve airflow and apply sulfur spray.
• Spider Mites: Tiny, invisible pests causing speckled leaves; spray with water and use horticultural oil if needed.
• Rust: Orange pustules on undersides of leaves; prune and remove infected leaves promptly.

Healthy Habits for Happy Roses

• Mulch to retain moisture and prevent soil splash (which spreads disease).
• Feed regularly with a balanced organic fertilizer.
• Water deeply, but not too frequently—roses prefer deep, infrequent watering.
• Clean up fallen leaves and petals to minimize disease spread.
• Plant companion plants like alliums to protect against pests. See my post on companion planting here.
• Choose a variety bred for health. My favorites for top healthy varieties include: Olivia Austin Rose by David Austin (Zone 5-9). Petal Pusher Drift Roses by Jackson and Perkins and Knock out Roses by Star Roses (Zone 5-11).

Pictured left to right: Knockout Rose, Olivia Rose, Petal Pusher Rose

Final Thought:

Caring for roses is a commitment – they need attention, love, and the occasional check- up. Stay ahead of problems with regular garden walks, and you’ll be rewarded with blooms that take your breath away. Want more information about roses? Check out my past blog posts here and here.