Eucalyptus Longhorned Borer
Phoracantha semipunctata, P. recurva
A large longhorned beetle that bores into eucalyptus trees, creating extensive galleries in the inner bark and cambium. Adults have distinctive long antennae and shiny, dark brown wing covers with yellow markings.
Identification & Symptoms
What to Look For
Potential Damage
Lifecycle
Female beetles lay eggs in groups of 3-30 under loose bark, up to 300 total eggs. Eggs hatch in 1-2 weeks depending on temperature. First-instar larvae may bore directly into inner bark or outer bark layers before turning inward. Larvae require 70 days in fresh wood during hot summer to 180 days in drier logs. Adults emerge from same holes. Complete life cycle requires 3-4 months in spring/summer, up to 9 months starting in fall/winter.
Professional Treatment Approach
Apply Imisol as preventive treatment to high-value trees
Use Imicide for contact kill of adults and larvae
Maintain adequate tree watering to reduce stress susceptibility
Remove and destroy heavily infested trees promptly
Apply treatments before peak adult emergence periods
Monitor trees during hot, dry periods when trees are most vulnerable
Recommended Mauget Products
Imisol
Professional-grade treatment specifically effective against eucalyptus longhorned borer.
View Product DetailsImicide
Professional-grade treatment specifically effective against eucalyptus longhorned borer.
View Product DetailsArborfos
Professional-grade treatment specifically effective against eucalyptus longhorned borer.
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