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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Species >> Trees

Aspen Borers: Trunk Spraying with Onyx or Merit

Six 16-year-old aspens have bark holes with bugs pushing out sawdust. Owner asks ID and removal.

ID: Borers

Larvae tunnel in wood, push frass out. Entry holes visible.

Treatment

  • Spray trunk with Onyx or Merit (imidacloprid).
  • Kills larvae inside, protects 3 months.
  • Available at nurseries; follow label for borer control.

Address Stress

  • Water during drought.
  • Fertilize: 10-10-10 at 1 lb/inch trunk diameter.

Borers attack stressed trees. Health improvement prevents recurrence.

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