Pests and diseases

What to look out for

Pests and diseases can ruin our way of life. From our enjoyment of the outdoors, to the kai we eat, the water we drink and our taonga native plants and animals. Pests and diseases could also have a devastating impact on our economy.

New Zealand maintains a list of around 15,000 unwanted plant, animal and aquatic pests and diseases. Our biosecurity system is constantly planning and adjusting for new threats.

What are pests and diseases?

Harmful plant pests (weeds), animal pests and diseases are biosecurity threats. They come in different forms, including:

  • Plants that can overrun our crops, native bush, waterways and marine environments
  • Bugs and parasites that can attack people, animals or plants, and spread disease
  • Pests that can harm our native animals and plants
  • Marine invaders that can interfere with local species
  • Pathogens (organisms that can causes disease)—making plants or animals sick, or may even kill them.

Learn more about why we want to keep pests and diseases out of New Zealand.

Diver inpsects marine pests
Diver inspecting marine pests.

Keeping pests and diseases out of New Zealand

As an island nation, we rely on both our imports and exports to maintain our way of life. With so much happening at our borders, the risks of pests and diseases entering New Zealand are high.

The world is full of pests and diseases that are not in New Zealand. We have strong biosecurity systems that identify new risks, monitor entry points and help us respond if anything shows up here. One way all of us can help is by staying vigilant and reporting anything unusual we think we've found. We can also help by making sure that we're not—intentionally or accidentally—bringing any pests or diseases into New Zealand.

Pests and diseases we want to keep out Tips for identifying pests and diseases

Controlling and removing pests and diseases

There are currently 24,000 pests registered in the Official New Zealand Pest Register (ONZPR). There are many programmes and projects around the country to contain or get rid of them. As a team of 5 million, we have a successful record of eradicating some harmful pests over the last 20 years. This includes the painted apple moth, pea weevil and Queensland fruit fly.

Pests and diseases New Zealand's currently facing include:

  • Plant and forest pests and diseases such as kauri dieback and velvetleaf. These can destroy crops and damage our native plants.
  • Marine pests and diseases like oyster parasite Bonamia ostreae, Mediterranean fanworm and invasive seaweeds— can damage marine life and threaten the kai moana we all enjoy eating.
  • Freshwater pests and diseases such as didymo, koi carp, oxygen weed and hornwort—can impact popular recreation activities, tourism, our drinking water and native species.
  • Other threats such as wilding pines, wild rabbits, wasps, wallabies and Mycoplasma bovis—put our precious ecosystems at risk and threaten our horticulture and agriculture industries. They can also prevent native plants and animals from flourishing. 

Microscopic pests and diseases can be invisible to our naked eye and it doesn't take much for them to spread. They can hitch a ride on our equipment and gear, our vehicles and vessels, our clothing and footwear, and even our animals and pets.

We may be harbouring harmful weeds and pests in our gardens. Those attractive garden plant clippings we're sharing could become harmful to our native bush and ecosystem if they are allowed to spread.

For tips on what you can do in your backyard to protect New Zealand's biosecurity, check out Weedbusters

As tāngata (people) we are responsible for the spread of some animal pests. For example, our pets can become pests if allowed to roam, if they escape, or if they are set free. Find out more about how we can stop our pets from becoming pests.

We all have a part to play to stop the spread of these pests and diseases. 

volunteer weeding
Guardians of the Bay of Islands volunteer weeding - 2019 NZ Biosecurity Award finalists

Identifying and reporting pests and diseases

If we all stay aware of risks and diseases, we can stop pests before they have a chance to spread. Ao noa, pōnoa. 24/7.

To report suspected new land, fresh water or marine pests, or diseases in plants or animals, call the Biosecurity New Zealand Pest and Disease Hotline on 0800 80 99 66.

Kiwis report about 10,000 suspected pests and diseases to Biosecurity New Zealand every year.

Learn more about pests and diseases Reporting a pest or disease
kiwiNet fruit collection and trapping fruit fly response
KiwiNet team members collecting fruit during fruit fly response

Managing pests and diseases—Eliminating the Queensland fruit fly

A small number of Queensland fruit flies were discovered around the Tāmaki Makaurau Auckland suburb of Northcote in early 2019. Their presence was a risk to our horticulture industry. They can make fruit and vegetables inedible and unfit for export.

A huge collaborative effort between the community, local authorities, industry partners and Biosecurity New Zealand eliminated this pest from Tāmaki Makaurau. 

Read more about the Queensland fruit fly response
Auckland Botanic Gardens Nursery Manager Doug Ward at work


New Plant Pass helps plant producers embrace biosecurity

Plant Pass is the new plant production biosecurity scheme offering a one-stop solution for producers and growers to ensure they’re using good biosecurity practice.



Getting closer to solutions for marine structures

The battle against marine pests will rapidly get easier if we can prevent them from growing on artificial structures like marina pontoons, wharf piles and seawalls. The Marine Biosecurity Toolbox has some promising leads.

Xerra Earth Observation Institute Starboard


Tracking pests from space wins big at Biosecurity Awards

A space-based biosecurity project has taken out the Supreme Award in the New Zealand Biosecurity Awards.

Learn more about pests and diseases

iNaturalist 720 x 400



iNaturalist is place where you can share what you see in nature

Pest and diseases handbook for potato growsers thumbnail 720 x 400


Pest and disease handbook for NZ potato growers

To help growers and agronomists to identify accurately pests and diseases.

New Zealand marine pest identification guide


New Zealand marine pest identification guide

This guide contains information about marine pest species that we don't want in New Zealand.

Keep Kauri Standing Recognising Kauri Dieback 720 x 400


Recognising Kauri Dieback

How to recognise physical symptoms of kauri dieback

Myrtle Rust in NZ 720 x 400


Myrtle Rust information hub

A one-stop-shop of information about myrtle rust in New Zealand

You can help

Biosecurity for walking, camping and biking

Biosecurity for walking, camping and biking

Protecting our bush and forests from pests and diseases.

Biosecurity for boating and water activities

Biosecurity for boating and water activities

Protecting our seas, rivers and lakes from pests and diseases.

Biosecurity at home

Biosecurity at home

Everyday practices to help protect our homes from pests and diseases.