Pests and weeds

This page contains information about many plant and animal pests that threaten our land and marine environments.

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Information is available for identifying species, the best methods of control and management of these pests, biocontrols and how the responsibilities for managing these pests are shared.

There are many plants and animals in the Tasman region that are considered undesirable. Ways of managing these are outlined in the Tasman-Nelson Regional Pest Management Strategy.

Tasman-Nelson Regional Pest Management Strategy

The Tasman-Nelson Regional Pest Management Strategy provides a framework for efficient and effective pest management in the Tasman-Nelson region by:

  • minimising actual and potential unintended effects associated with the organisms identified as pests;
  • maximising the effectiveness of individual pest management action by way of a regionally co-ordinated response

Further information about the Strategy can be found at the link below:

Pests Summary Brochure

There is also a summary booklet that highlights your responsibilities for dealing with pests at your place. Use the link below to check it out. 

Pests Information Brochure (pdf, 3 MB)


There is a free online tool available to assist farmers and agricultural professionals with pest and weed identification and management decision making.

Identifying and controlling pests and weeds

Find out more about the pests and weeds that affect the Tasman region:

Pest Ants
Pest Birds
Pest Fish
Pest mammals
Sabella small scale management programme
The Great White Butterfly

Controlling aquatic weeds and wetland invaders

This section describes aquatic and wetland invaders as identified in the Tasman-Nelson Regional Pest Management Strategy.

Please note that most aquatic and wetland plants are dispersed by stem or root fragments, so care should be taken when removing such plants to remove all material. Consider carefully what plants you buy for ponds and aquariums. If unsure, check with a Biosecurity Officer. Never dump aquarium contents or water into stormwater drains or water ways.

A brochure containing the information on this page can be downloaded:

Pest plant identification and control
Pest fish identification and control
Identification and control of other wetland invaders
Herbicide Notes

Controlling Ground Cover and Grass Invaders

Identify pest ground covers and grass invaders which are included in the Tasman-Nelson Regional Pest Management Strategy.

The brochure containing this information is available below:

Ground covers and grass invaders identification and control
Herbicide notes

Controlling pest tree invaders

Identify pest tree invaders, some of which are included in the Tasman-Nelson Regional Pest Management Strategy.

The brochure containing this information is available below:

Pest tree invaders identification and control
Taiwan cherry
Herbicide notes


Biocontrols refers to biological control agents that are brought in to reduce the vigour and viability of widespread pests. It requires extensive research and careful testing to ensure that only that the target species of weeds are affected.

Information on biocontrol agents

Who is responsible

Biosecurity responsibilities are shared between central government, regional councils, industry and landowners. Read more to gain a better understanding of the role of the various parties.

Central Government
Regional Councils

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