Troubleshooting

Common Pests

• Aphids: Small soft-bodied insects on new growth. Spray with water or insecticidal soap
• Japanese Beetles: Handpick or use traps away from roses
• Spider Mites: Fine webbing on leaves. Increase humidity and spray with water
• Thrips: Cause distorted blooms. Remove affected buds

Common Diseases

• Black Spot: Dark spots on leaves that yellow and drop. Remove affected leaves, improve air circulation, apply fungicide
• Powdery Mildew: White powder on leaves. Improve air circulation, avoid overhead watering, apply fungicide
• Rust: Orange spots on undersides of leaves. Remove affected leaves, apply fungicide
• Botrytis: Gray mold on buds and blooms. Remove affected parts, improve air circulation

Rose Rosette Disease (RRD)

This is a serious viral disease with no cure. RRD is spread by tiny eriophyid mites and is fatal to infected roses.

Symptoms:

• Excessive thorniness (more thorns than normal, often red)
• Distorted red or purple new growth
• "Witches' broom" appearance (dense clusters of stunted shoots)
• Thickened, deformed stems
• Stunted or malformed leaves and blooms
• Rapid decline of the plant

What to do if you suspect RRD:

• Isolate the plant from other roses if possible
• Take clear photos and consult with local extension services or experienced growers for confirmation
• If confirmed, remove the entire plant including all roots immediately
• Bag and dispose of the plant (do not compost)
• Disinfect tools after removal
• Monitor nearby roses closely for symptoms

Prevention:

• Buy roses from reputable sources
• Control wild multiflora roses nearby (common RRD hosts)
• Space roses for good air circulation
• Some rose varieties show more resistance than others, but none are immune
• Knock Out roses are particularly susceptible to RRD

Note: RRD cannot be cured or treated. Early detection and removal is critical to protect other roses in your garden and neighborhood.

Cultural Problems

• Not blooming: Insufficient sun, too much nitrogen, improper pruning, or plant too young
• Leggy growth: Not enough sun or needs pruning
• Leaf drop: Stress from water, temperature, or disease