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  Services » Regional Services » Plant and animal pests » Pest plant control over water operations under Resource Consent 124871

Pest plant control over water operations under Resource Consent 124871

On this page: ConsentConsent numberPest plants, Herbicide, WhereWhenNotifications 

Waikato Regional Council holds a resource consent for the application of agrichemicals to air where they may enter water and the coastal marine area within the Waikato region. The consent allows the use of specific herbicides for control of pest plants that cannot generally be controlled only with glyphosate.

Image - alligator weed


Aerial application of agrichemichals to air where it may enter water and the coastal marine area within the Waikato region. 

Consent number


Pest plants

The pest plants to be controlled in 2017-18 include, but are not limited to:

These plants all grow in and around aquatic or marine areas. Herbicides used may enter water.


This Resource Consent permits the use of the following herbicides:

Active ingredient Example brand name
Haloxyfop-R-methyl Agpro Haloxyfop 100, Gallant™ Ultra
Imazapyr isopropylamnine Unimaz™ 250 SL
metsulfuron-methyl Agpro Meturon®, Associate® 600WDG, Escort®,
Triclopyr trimethylamine salt Garlon™ 360
Polyether modified polysiloxane Agpro Organosilicone, Pulse penetrant

Note: Glyphosate use is a permitted activity in the Waikato Regional Plan.

Spraying will be by knapsack, hand spray equipment (e.g. gun and hose/mist blower) or helicopter using low drift nozzles.


Click on your zone to find out if your property is an operational area for 2017-18.

Click on this map of the Waikato region to find the plant pest contractor details for your area


Application may occur at any time during daylight hours, providing weather and tide conditions are suitable. As these pest plants are difficult to control, two to three follow-up applications may occur over the next 12 months. It is unlikely that spraying will occur during game hunting season.


If you would like to be notified when herbicide control will be carried out and/or:

  • have a consented water take
  • take water for domestic purposes in the operational area
  • are a certified organic producer

Please email

Upcoming herbicide control

Below is a list of scheduled spraying. This list will be updated regularly so please check this page for updates.

Click here for past spraying operations. 

DateLocationControl typeHerbicideMap number/sTarget pest plant
23-24 February 2018 Lakes Rotoroa & Rotokaeo Gun & hose Metsulfuron 71 & 72 Parrot's feather, yellow flag iris
19 February - 5 March 2018 Ruahorehore Stream, Waihi Knapsack Metsulfuron 18 Alligator weed
11 - 25 February 2018 Piako River downstream from Pipiroa Mistblower Haloxyfop 21 Spartina
10 - 25 February 2018 Waihou River, upstream and downstream of Turua Gun and hose & mistblower Haloxyfop 21A Manchurian wild rice & spartina
9 February - 2 March 2018 Lake Whangape Helicopter Metsulfuron 6 Alligator weed
5 - 26 February 2018 Waikato River from Ngaruawahia to Waikato delta, Lake Whangape, Lake Waikare and Te Onetea & Whangape Streams Gun & hose Metsulfuron 1, 3, 4, 5A, 5B, 6, 7, 9, 10A, 10B, 11A Alligator weed
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