Granulate Ambrosia Beetle

Granulate ambrosia beetle is an exotic pest that bores into broadleaf trees, including native species and commercial fruit trees. It is a serious pest overseas and was first detected in New Zealand in 2019.

A tell-tale sign is distinctive protrusions of frass (compacted sawdust) from bark that look like toothpicks. They are caused by the beetles pushing frass out of tunnels bored into the trees. Other symptoms include sap oozing from the tunnel entrances and branch dieback.

If you see the beetle or any sign of frass on trees:

  • take a photo
  • phone the pests and diseases hotline on 0800 80 99 66.


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