Sudden Fly Infestation on Roses in New Mexico

Flies swarming roses with yellowing, chewed leaves suggest a hatch-out event—likely eggs laid at the base weeks ago. It's not a typical rose pest, but it happens.

Quick Control

• Spray any rose-labeled insecticide (neem oil, spinosad, or pyrethrin) following label directions.
• Thoroughly wet the base of the plant and soil surface to catch emerging larvae.
• Repeat in 7–10 days.

Underlying Stress?

Healthy roses resist pests better. Check watering (deep, infrequent), drainage, and whether recent heat stressed the plants. The flies may be secondary to a weakened plant.

They'll likely disappear as suddenly as they appeared once the generation cycles through.