Termite
New Zealand has three species of termite. They are social animals, living in small colonies made up of workers and soldiers (lacking eyes and wings), and a reproductive pair (the king and queen). They feed on wood, and tunnel into tree trunks and timber doing damage similar to Borer.
Be aware these pests can destroy your home
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How to get rid of termites in your home
The treatment for this pest is very similar to Borer and a combination treatment can be done.
The Cost: because of the complexity of treating these we would need to look at your property and supply a quotation.