Rose Midge Damage on Yellow Roses in Louisiana: Identification and Control

The mysterious damage on your yellow roses—blackened bud edges, dark centers in open blooms, mouse-like droppings—is classic rose midge infestation, nearly invisible until damage appears.

Understanding Rose Midge

• Microscopic winged insects (1–2 mm)
• Lay eggs in flower buds
• Larvae feed inside buds, destroying petals and stamens
• Multiple generations per season in warm climates
• Frass (droppings) resembles tiny black specks

Integrated Control

Cultural:

• Remove and destroy all damaged buds (contain larvae)
• Clean up fallen buds and petals daily

Chemical (Systemic Required):

• Contact sprays can't reach larvae inside buds
• Acephate (Orthene) or Dimethoate (Cygon-2E) - systemic, translocate to buds
• Apply at first bud formation, repeat per label
• Rotate modes of action to prevent resistance

Southern Climate Challenge

Louisiana's long growing season means 5+ generations annually. Early, consistent systemic treatment is essential. Consider preventive soil drench at bud break next spring.

Your other plants are unaffected—rose midge is rose-specific.