Every year Waikato Regional Council carries out targeted spray operations to control invasive pest plants growing in our rivers, lakes and wetlands.
This work is important to protect the environment – and in particular agricultural production – from the impacts of these pest plants, as well as to improve biodiversity.
Resource consent 124871
Waikato Regional Council holds a resource consent (124871) to carry out this work. The consent authorises:
- the application of agrichemicals to air where they may enter water and the coastal marine area within the Waikato region, and
- the use of specific herbicides for controlling pest plants that cannot generally be controlled with glyphosate.
Public notice - spraying operations
Waikato Regional Council advises that under Resource Consent 124871 spraying of pest plants growing in aquatic and semi-aquatic locations will continue over the next three months.
You can read the public notice below. For specific details of when, where and what we are spraying, please check the scheduled operations information on this webpage.
Where and when are we spraying?
Where are we spraying?
You can access and view our map of operational areas using the link above.
- Operational areas are shown on the map with purple shading.
- Use the Search bar in the top left-hand corner to search for your address and see where spraying is happening in relation to your property.
When are we spraying?
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 duck shooting season. There will be no spraying on public holidays.
For more details, see the list of scheduled spraying operations on this page.
Register for notifications
We can notify you by email or text message of specific times when spraying is happening near your property.
- First, use the map (link above) to find the operational area you want to be notified for.
- Click on the area and then click "Sign up for notifications". This will direct you to an online form to register for notification. Easy!
What we use and control
Scheduled herbicide control operations
Below is a list of scheduled spraying operations. This list is updated regularly, so please check this page for updates.
| Date | Location | Control type | Herbicide | Target pest plants | Contact |
|---|---|---|---|---|---|
|
13 February - 6 March 2025 (weather permitting) |
Whangamarino Wetland, Falls Road, Waerenga |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
12 February - 5 March 2025 (weather permitting) |
Lake Whangape |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
12 February - 5 March 2025 (weather permitting) |
Opuatia Wetland, Churchill Road, Rangiriri |
Helicopter |
Metsulfuron |
Yellow flag iris |
Craig Purvis on 027 555 4441 |
|
3 February - 15 February 2025 (weather permitting) |
Lake Rotorua, Hamilton Lake |
Knapsack, mistblower |
Metsulfuron |
Mexican water lily |
Annemarie Robb on 021 284 9734 |
|
10 February - 2 March 2025 (weather permitting) |
Lower Waipa River |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
5 February - 27 February 2025 (weather permitting) |
Aotea Road |
Knapsack, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 027 330 8016 |
|
31 January - 10 February 2025 (weather permitting) |
Mystery Creek Stream |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 027 330 8016 |
|
30 January - 20 February 2025 (weather permitting) |
Lower Waikato River, Ngaruawahia to Tuakau |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
26 January - 16 February 2025 (weather permitting) |
Waihou River from Hikutaia Cut to Kopu |
Gun and hose |
Haloxyfop |
Manchurian wild rice |
Heidi Pene on 027 248 6447 |
|
23 January - 13 February 2025 (weather permitting) |
Lake Whangape |
Knapsack, gun and hose |
Triclopyr |
Cuscuta |
Reuben Libline on 021 972 962 |
|
20 January - 10 February 2025 (weather permitting) |
Mangakaware Stream and wetland |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
20 January - 7 February 2025 (weather permitting) |
Matahuru Stream |
Knapsack, gun and hose, mistblower |
Metsulfuron |
Alligator weed, Yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
20 January - 7 February 2025 (weather permitting) |
Huntly Ash Ponds |
Knapsack, gun and hose, mistblower |
Metsulfuron |
Alligator weed, Yellow flag iris |
Hamish Hodgson on 021 569 206 |
|
16 January - 7 February 2025 (weather permitting) |
Ruapuke Beach, Toreparu Stream, TM Station Drains, Tauhua Stream, Turiakina Stream Mouth |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
15 January - 7 February 2025 (weather permitting) |
Te Otamanui Lagoon |
Knapsack, gun and hose, mistblower |
Triclopyr, Glyphosate |
Alligator weed, Senegal tea |
Frances McKinnon on 027 330 8016 |
|
15 January - 4 February 2025 (weather permitting) |
Courtney property 8820 Paeroa Kopu Road |
Knapsack, gun and hose |
Haloxyfop |
Manchurian wild rice |
Chris Hale on 027 440 4251 |
|
13 January - 3 February 2025 (weather permitting) |
1589 SH25 Tairua-Whitianga Highway |
Knapsack, gun and hose |
Metsulfuron |
Water poppy |
Benson Lockhart on 021 618 364 |
|
13 January - 31 January 2025 (weather permitting) |
Paterson drain |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
13 January - 31 January 2025 (weather permitting) |
Stream near Wairere Drive, Logan Court, Milbrook Place |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
13 January - 31 January 2025 (weather permitting) |
Stream - corner Gordonton-Puketaha Road |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
13 January - 31 January 2025 (weather permitting) |
Mangakotukukutu Stream Stream - corner Gordonton-Puketaha Road |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
13 January - 31 January 2025 (weather permitting) |
Somerton Ponds and Kirikiriroa stream - Thomas Road |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Alligator weed |
Annemarie Robb on 021 284 9734 |
|
6 January - 27 January 2025 (weather permitting) |
Te Mata Stream & Opotoru River |
Knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate |
Yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
6 January - 27 January 2025 (weather permitting) |
Lower Waikato River - Ngaruawahia to Mercer and Te Onetea Stream |
Mist-blower, gun and hose |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
6 January - 18 January 2025 (weather permitting) |
Waihou River Turua, Kopu to Hikutaia Cut - True left |
Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 027 248 6447 |
|
23 December - 13 January 2025 (weather permitting) |
Huntly Ash Ponds |
Knapsack, gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Reuben Libline on 021 972 962 |
|
20 December - 10 January 2025 (weather permitting) |
Hall Road Wetland |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
Hamish Hodgson on 021 569 206 |
|
20 December - 23 December 2024 (weather permitting) |
Lower Waikato River - Ngaruawahia to Mercer |
Mistblower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
16 December - 6 January 2025 (weather permitting) |
Whangamaire Stream, Taupiri |
Knapsack, gun and hose, mistblower |
Metsulfuron |
Yellow flag iris |
Reuben Libline on 021 972 962 |
|
16 December - 6 January 2025 (weather permitting) |
Awaroa River, Waiuku |
Knapsack, gun and hose |
Metsulfuron |
Senegal tea |
Reuben Libline on 021 972 962 |
|
14 December - 23 December (weather permitting) |
Te Otamanui Lagoon |
Helicopter, knapsack, gun and hose, mistblower |
Metsulfuron, Glyphosate, Triclopyr |
Alligator weed |
Frances McKinnon on 027 330 8016 |
|
10 December - 20 December (weather permitting) |
1589 State Highway 25, Whenuakite |
Knapsack, gun and hose |
Metsulfuron |
Water poppy |
Benson Lockhart on 021 618 364 |
|
9 December - 20 December 2024 (weather permitting) |
Kawhia Harbour - Hikuparea Road, Kawhia |
Knapsack gun and hose |
Metsulfuron; Glyphosate |
Alligator weed |
Frances McKinnon on 027 330 8016 |
|
9 December - 27 December 2024 (weather permitting) |
Ruahorehore Stream, Waihi |
Knapsack |
Metsulfuron |
Alligator weed |
Heidi Pene on 027 248 6447 |
|
5 December - 20 December 2024 (weather permitting) |
Turiakina Stream Mouth |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
5 December - 20 December 2024 (weather permitting) |
Tauhua Stream |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
5 December - 20 December 2024 (weather permitting) |
TM Station Drains |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
4 December - 20 December 2024 (weather permitting) |
Lake Rotoroa |
Knapsack |
Metsulfuron |
Yellow flag iris |
Hamish Hodgson on 021 569 206 |
|
3 December - 13 December 2024 (weather permitting) |
Holland Close, Pauanui |
Knapsack |
Metsulfuron |
Alligator weed |
Hamish Hodgson on 021 569 206 |
|
2 December - 23 December 2024 (weather permitting) |
Rutherford Road Drains, Mangawara |
Knapsack, gun and hose |
Metsulfuron |
Alligator weed |
Reuben Libline on 021 972 962 |
|
2 December - 23 December 2024 (weather permitting) |
Matahuru Stream and Drains |
Knapsack |
Metsulfuron |
Alligator weed |
Reuben Libline on 021 972 962 |
|
27 November - 18 December 2024 (weather permitting) |
Hall Road Wetland |
Mistblower and knapsack |
Metsulfuron |
Alligator weed |
Hamish Hodgson on 021 569 206 |
|
26 November - 17 December 2024 (weather permitting) |
Ohinemuri River from Baxter Road, Waihi to Paeroa Township |
Knapsack |
Metsulfuron |
Alligator weed |
Heidi Pene on 027 248 6447 |
|
26 November - 10 December 2024 (weather permitting) |
Waihou River from Hikutaia Cut to Kopu - True left |
Gun and hose |
Haloxyfop |
Spartina, Manchurian wild rice |
Heidi Pene on 027 248 6447 |
|
25 November - 16 December 2024 (weather permitting) |
Whangamaire Stream |
Knapsack, mistblower |
Metsulfuron |
Yellow flag iris |
Reuben Libline on 021 972 962 |
|
28 November - 20 December 2024 (weather permitting) |
Tuhikaramea Stream |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Yellow flag iris |
Frances McKinnon on 027 330 8016 |
|
19 November 2024 – 10 December 2024 (weather permitting) |
Lower Waikato River, Ngaruawahia to Whangape Stream |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021502099 |
14 November 2024 - 12 December 2024 (weather permitting) |
Pooles Road Drain and Gordon Ave Wetland and pond - Te Aroha |
Knapsack |
Metsulfuron |
Alligator weed |
Heidi Pene on 027 248 6447 |
|
11 November 2024 – 11 December 2024 (weather permitting) |
Lincoln Street drain to Kahikatea Road drain |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Alligator weed |
Annemarie Robb on 0212849734 |
|
11 November 2024 – 11 December 2024 (weather permitting) |
Mangakotukutukutu Stream, Peacockes |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Alligator weed |
Annemarie Robb on 0212849734 |
|
11 November 2024 – 11 December 2024 (weather permitting) |
Sandford Gully, Glenview |
Knapsack, Mist blower |
Metsulfuron |
Japanese knotweed |
Annemarie Robb on 0212849734 |
|
11 November 2024 – 11 December 2024 (weather permitting) |
Somerton Ponds and Kirikiriroa Stream - Thomas Road |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Alligator weed |
Annemarie Robb on 0212849734 |
|
11 November 2024 – 11 December 2024 (weather permitting) |
Gordonton-Puketaha Road |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Alligator weed |
Annemarie Robb on 0212849734 |
|
11 November 2024 – 11 December 2024 (weather permitting) |
Stream Wairere Drive, Logan Court, Milbrook Place |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 0212849734 |
|
11 November 2024 – 2 December 2024 (weather permitting) |
Kawhia Harbour, Aotea Harbour |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 0273308016 |
|
11 November 2024 – 30 November 2024 (weather permitting) |
Te Onetea Stream |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021502099 |
|
11 November 2024 – 29 November 2024 (weather permitting) |
Ruapuke Stream Mouth, Toreparu Stream, Matauwai Stream |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 0273308016 |
Past herbicide spraying operations
You can see details below of herbicide spraying operations that have been carried out over the past year. If you would like details of earlier spraying operations, please contact us.
| Date | Location | Control type | Herbicide | Target pest plants |
|---|---|---|---|---|
|
7 November 2024 – 28 November 2024 (weather permitting) |
Pukerimu Lane Ponds |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Yellow flag iris |
29 October – 25 November 2024 (weather permitting) |
Small pond on dairy farm Matai Rd Matamata |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Yellow flag iris |
29 October – 18 November 2024 (weather permitting) |
Small stream from Kereone Road to Cussen Road Morrinsville |
Knapsack |
Metsulfuron |
Yellow flag iris |
29 October – 18 November 2024 (weather permitting) |
Maungahaumia Stream - Matuku Rd to Morrinsville Tahuna Rd Morrinsville |
Knapsack, Gun and hose |
Metsulfuron |
Yellow flag iris |
25 October 2024 – 15 November 2024 (weather permitting) |
Paratawa Stream - Old Mountain Road |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Yellow flag iris |
|
19 October 2024 – 9 November 2024 (weather permitting) |
Lower Waikato River. Horotiu to Tuakau |
Knapsack, Mist-blower |
Metsulfuron |
Alligator weed |
|
15 October – 5 November 2024 (weather permitting) |
Pond and stream at Pirongia Road, Pond at Raynes Road, Te Puroa Road, Ngaruawahia |
Knapsack |
Metsulfuron, Glyphosate |
Yellow flag iris |
|
7 October 2024 – 28 October 2024 (weather permitting) |
Waikato River - Port Waikato to Tauranganui |
Gun and hose |
Metsulfuron |
Alligator weed |
|
7 October 2024 – 28 October 2024 (weather permitting) |
Komakorau Stream near Golf course |
Knapsack |
Metsulfuron |
Alligator weed |
|
26 September 2024 - 17 October 2024 (weather permitting) |
Lower Waikato River. Horotiu to Mercer. Te Onetea Stream |
Knapsack, Mist-blower |
Metsulfuron |
Alligator weed, Yellow flag iris |
|
18 September – 9 October 2024 (weather permitting) |
Pirongia Road, Old Mountain Road, Te Puroa Road, Pukerimu Lane, Clearway Rise, Tuhikaramea Stream |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Yellow flag iris |
|
16 September 2024 – 7 October 2024 (weather permitting) |
Huntly pools by Tainui Bridge |
Knapsack, Gun and hose, Mist-blower |
Metsulfuron |
Alligator weed, Yellow flag iris |
|
10 September 2024 – 1 October 2024 (weather permitting) |
Murphy Lane Wetland Taupiri |
Knapsack, Mist-blower |
Metsulfuron |
Yellow flag iris |
|
4 September 2024 - 24 September 2024 (weather permitting) |
Lower Waikato River. Horotiu to Mercer. Te Onetea Stream |
Knapsack, Mist-blower |
Metsulfuron |
Alligator weed |
|
14 August – 4 September 2024 (weather permitting) |
Lower Waikato River. Horotiu to Mercer. Te Onetea Stream |
Knapsack, Mist-blower |
Metsulfuron |
Alligator weed |
|
1 July – 21 July 2024 (weather permitting) |
Waikato River, Huntly to Whangape Stream, Te Onetea Stream |
Knapsack, Mist-blower |
Metsulfuron |
Alligator weed |
|
1 July – 21 July 2024 (weather permitting) |
Waikato River, Horotiu to Huntly |
Knapsack, Mist-blower |
Metsulfuron |
Alligator weed |
|
21 June – 5 July 2024 (weather permitting) |
Pond at Cambridge golf course |
Knapsack, Gun and hose |
Imazapyr |
Water poppy |
|
10 June – 30 June 2024 (weather permitting) |
Lower Waikato River, Huntly to Mercer |
Mist blower |
Metsulfuron |
Alligator weed |
|
7 June – 28 June 2024 (weather permitting) |
Te Otamanui Lagoon |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Senegal tea |
|
3 June – 24 June 2024 (weather permitting) |
Te Poi private property small stream off Tauranga Road |
Knapsack, Gun and hose |
Imazapyr |
Water poppy |
|
31 May – 25 June 2024 (weather permitting) |
Mangaonua Stream |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
|
29 May – 12 June 2024 (weather permitting) |
Waihi Campground pond |
Knapsack |
Metsulfuron |
Yellow flag iris |
|
28 May – 11 June 2024 (weather permitting) |
Horahora wetlands on private property |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice |
|
28 May – 11 June 2024 (weather permitting) |
Private property in Puriri - small gully stream |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice |
|
27 May – 17 June 2024 (weather permitting) |
Tauhua Stream and Turiakina Stream |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
|
27 May – 17 June 2024 (weather permitting) |
Pond at Cambridge golf course |
Knapsack, Gun and hose |
Imazapyr |
Water poppy |
|
20 May – 3 June 2024 (weather permitting) |
Pond on private property Tauranga Road Te Poi |
Knapsack, Gun and hose |
Metsulfuron |
Yellow flag iris |
|
20 May – 3 June 2024 (weather permitting) |
Waihi Township Small creeks and Drains |
Knapsack |
Metsulfuron |
Yellow flag iris |
|
13 May – 27 May 2024 (weather permitting) |
Private property in Puriri - small gully stream |
Gun and hose |
Haloxyfop |
Manchurian wild rice |
|
13 May – 27 May 2024 (weather permitting) |
Horahora Wetlands on private property |
Gun and hose |
Haloxyfop |
Manchurian wild rice |
|
8 May – 30 May 2024 (weather permitting) |
Turiakina Stream Mouth, Marokopa and Tauhua Stream |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
|
6 May – 24 May 2024 (weather permitting) |
Tainui Street & Rerenga Street Drain, Mokau and Pond at Redwood Park, Otorohanga |
Knapsack, Gun and hose, Mist blower |
Imazapyr |
Rough Horsetail, Field Horsetail |
|
30 April – 21 May 2024 (weather permitting) |
Hall Road Wetland |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
|
30 April – 21 May 2024 (weather permitting) |
Stream near Wairere Drive, Logan Court, Milbrook Place |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
|
30 April – 30 April 2024 (weather permitting) |
Lincoln Street Drain to Kahikatea Road Drain |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
|
30 April – 30 April 2024 (weather permitting) |
Chartwall Gully |
Knapsack, Mist blower |
Metsulfuron |
Yellow flag iris |
|
29 April – 20 May 2024 (weather permitting) |
Sommerton Ponds and Kirikiriroa Stream |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
|
29 April – 29 April 2024 (weather permitting) |
Stream - corner Gordonton-Puketaha Road |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
|
29 April 2024 - 17 May 2024 (weather permitting) |
Waikato River and Mystery Creek |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
|
29 April 2024 - 17 May 2024 (weather permitting) |
Aotea Harbor - Aotea Road |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
|
29 April 2024 - 17 May 2024 (weather permitting) |
Kawhia Harbor - Hikuparea Road |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
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