New Rose Bushes with Sticky Leaves and Browning: Aphid Infestation

Diagnosing Sticky, Browning Leaves on June-Planted Roses in New Mexico

Four roses planted in June thrived until recently. Three show sticky leaves, dark brownish-green color, brown tips. Cutting bad leaves didn't help. Some leaves yellow, thick, brittle.

Primary Diagnosis: Aphids

Only aphids excrete honeydew (sticky substance). They suck leaf sap → leaves die and dry out. Multiple aphid species exist.

Resource: Aphid identification guide

Secondary Possibilities

• Fertilizer burn: Granular fertilizer on soil in heat → leaf tip burn
• Spider mites: Tiny spiders suck leaf juices → discoloration and death

Action

• Google "aphids" for damage comparison photos
• Treat with insecticidal soap or rose insecticide
• Check leaf undersides for tiny green/black insects
• Water deeply to reduce heat stress