9315 Roses

Fungal disease

Black Spot

Black spot shows up as circular black blotches on the upper leaf surface, usually starting low on the plant and moving upward. Infected leaves yellow and drop early, especially in wet weather.

What I did

• Removed affected leaves but kept healthy green growth.
• Snipped dead branches and pruned as soon as new spotting showed up.
• Watered at the base so the foliage stayed drier.
• Cleaned pruners with rubbing alcohol.
• Hard pruned in fall and again in spring to help the plant recover.

Fungal disease

Powdery Mildew

Leaves become covered with a white, powdery fuzz. Good air circulation and careful watering help reduce the conditions mildew likes best.

What I did

• Cut off affected growth.
• Wiped clippers with alcohol before moving to another plant.
• Directed summer watering toward the root zone instead of the leaves.

Virus symptom

Mosaic

Bright yellow patterns made of wavy lines can show up on leaves. This page currently documents the symptom to watch for more than a full treatment story.

Insect pest

Aphids

Aphids are soft-bodied insects that can be red, green, yellow, or black. They leave sticky honeydew behind, which often attracts ants.