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 |
|---|---|---|---|---|---|
|
29 May to 19 June 2026 (weather permitting) |
Wilcox pond and stream |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed |
Reuben Libline on 021 972 962 |
|
25 May to 14 June 2026 (weather permitting) |
Whangapoua Harbour |
Knapsack |
Haloxyfop |
Spartina, Pampas, Saltwater paspalum |
Jennifer Armstrong on 028 470 0910 |
|
22 May to 12 June 2026 (weather permitting) |
Port Waikato drains |
Knapsack |
Metsulfuron |
Alligator weed |
Reuben Libline on 021 972 962 |
|
22 May to 12 June 2026 (weather permitting) |
Gordonton Road farm drains |
Knapsack |
Metsulfuron |
Yellow flag iris |
Reuben Libline on 021 972 962 |
|
22 May - 12 June 2026 (weather permitting) |
Drain on private property - Kereone road, Morrinsville |
Knapsack |
Metsulfuron, Glyphosate |
Yellow flag iris |
Heidi Pene on 021 432 874 |
|
22 May - 12 June 2026 (weather permitting) |
Waihi campground pond, Waitete Road |
Knapsack |
Metsulfuron, Glyphosate |
Yellow flag iris |
Heidi Pene on 021 432 874 |
|
20 May - 3 June 2026 (weather permitting) |
TM Station Drains, Matauwai, Tauhua, Turiakina Streams |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
|
14 - 29 May 2026 (weather permitting) |
Mystery Creek Stream |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
|
12 May - 2 June 2026 (weather permitting) |
Pond on Morrinsville Golf Course |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Mexican water lily |
Heidi Pene on 021 432 874 |
|
12 May - 2 June 2026 (weather permitting) |
Private pond on Puketutu Road, Matamata |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Mexican water lily |
Heidi Pene on 021 432 874 |
|
12 May - 2 June 2026 (weather permitting) |
Pond on private property - Pukekauri Road, Waihi |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Mexican water lily |
Heidi Pene on 021 432 874 |
|
12 May - 2 June 2026 (weather permitting) |
Waihou River stopbanks & terrestrial margins from Hikutaia Cut to Kopu |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
12 May - 2 June 2026 (weather permitting) |
Wetland on private property, Puriri |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice |
Heidi Pene on 021 432 874 |
|
11 - 22 May 2026 (weather permitting) |
Ruahorehore Stream, Waihi |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
Heidi Pene on 021 432 874 |
|
5 - 26 May 2026 (weather permitting) |
Lake Rotokaeo |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed, Yellow flag iris, Mexican water lily |
Annemarie Robb on 021 284 9734 |
|
5 - 26 May 2026 (weather permitting) |
Lake Rotoroa |
Gun and hose |
Metsulfuron |
Mexican water lily |
Annemarie Robb on 021 284 9734 |
|
5 - 15 May 2026 (weather permitting) |
TM Station Drains, Matauwai, Tauhua, Turiakina Streams |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
30 April to 15 May 2026 (weather permitting) |
Mangakaware Stream and wetland |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
30 April to 21 May 2026 (weather permitting) |
Waikato Riverbanks beside Te Ohaki Road from Huntly Ash ponds to Huntly Power Station |
Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Reuben Libline on 021 972 962 |
|
30 April to 14 May 2026 (weather permitting) |
Waikato Riverbank from Huntly Ash ponds to Huntly Power Station |
Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Reuben Libline on 021 972 962 |
|
29 April to 19 May 2026 (weather permitting) |
Mangaonua Stream |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed, Yellow flag iris |
Craig Purvis on 027 555 4441 |
|
29 April to 20 May 2026 (weather permitting) |
Piako River from Awaiti Canal to Pipiroa |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
24 April to 14 May 2026 (weather permitting) |
1589 Tairua-Whitianga Highway |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Water poppy |
Jack Hamilton on 022 852 0298 |
|
22 April to 8 May 2026 (weather permitting) |
Kawhia Harbour - Hikupara Road, Aotea Harbour - Aotea Road |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
|
15 April to 6 May 2026 (weather permitting) |
Pooles Road Drain, Te Aroha |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed |
Heidi Pene on 021 432 874 |
|
15 to 29 April 2026 (weather permitting) |
Waihou River from Hikutaia cut to Kopu |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
10 April to 1 May 2026 (weather permitting) |
Mangaonua Stream - Phillip Lane to Hoeka Road |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed, Yellow flag iris |
Craig Purvis on 027 555 4441 |
|
9 - 24 April 2026 (weather permitting) |
San Clemento Way |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Stream - corner Gordonton-Puketaha Road |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Somerton Ponds & Kirikiriroa Stream, Thomas Road |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Stream near Wairere Drive, Logan Court, Milbrook Place |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Lincoln Street Drain to Kahikatea Road Drain |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Lake Rotoroa |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Hamilton Gardens, Turtle Lake & Stream |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Lake Rotokaeo |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Sanford Gully, Glenview |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Hall Road Wetland |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Acacia Crescent, Glenview |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
9 - 23 April 2026 (weather permitting) |
Mangakotukutukutu Stream |
Knapsack |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
7 - 28 April 2026 (weather permitting) |
Pond at Clark Lane, Karamu |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Spartina |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Pond at Te Mawhai Road |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Water poppy |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Turiakina Stream Mouth |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Tauhua Stream |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Coastal wetland near Wainui Stream, Taharoa |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Near Matauwai Stream, Taharoa |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Toreparu Stream |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Ruapuke Stream Mouth |
Knapsack, gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, yellow flag iris |
Frances McKinnon on 021 467 857 |
|
7 - 28 April 2026 (weather permitting) |
Lower Waikato River - Ngaruawahia to Mercer |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
31 March - 15 April 2026 (weather permitting) |
Mystery Creek Stream |
Knapsack |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
|
30 March - 17 April 2026 (weather permitting) |
Mangakaware Stream and Wetland |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
30 March - 20 April 2026 (weather permitting) |
Waihi campground pool, Waitete Road |
Knapsack |
Metsulfuron, Glyphosate |
Yellow flag iris |
Heidi Pene on 021 432 874 |
|
30 March - 20 April 2026 (weather permitting) |
Ruahorehore Stream, Waihi |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
Heidi Pene on 021 432 874 |
|
30 March - 20 April 2026 (weather permitting) |
Waikato River - Whangape Stream to Ohinewai |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Reuben Libline on 021 972 962 |
|
30 March - 21 April 2026 (weather permitting) |
Waipa River - Ngaruawahia to Te Kowhai |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
16 March 2026 - 3 April 2026 (weather permitting) |
Lake Whangape |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
17 March - 3 April 2026 (weather permitting) |
Stream through private property from Kereone Road to Cussen Road, Morrinsville |
Knapsack |
Metsulfuron |
Yellow flag iris |
Heidi Pene on 021 432 874 |
|
13 March - 4 April 2026 (weather permitting) |
Lower Waikato River, Huntly to Mercer |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
15 March - 22 March 2026 (weather permitting) |
Waihou River from Omahu Canal to Kopu |
Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
12 March - 2 April 2026 (weather permitting) |
Waihou River from Rangiora Road to Kopu |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
12 March - 2 April 2026 (weather permitting) |
Piako River from Awaiti Canal Road to Pipiroa |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
9 March 2026 - 29 March 2026 (weather permitting) |
Te Otamanui Lagoon |
Helicopter, Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed, Senegal tea |
Frances McKinnon on 021 467 857 |
|
9 March 2026 - 27 March 2026 (weather permitting) |
Woodside Estate and adjacent railway drain |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
4 March 2026 - 18 March 2026 (weather permitting) |
Te Otamanui - Te Kowhai North |
Knapsack, Gun and hose, Mist blower |
Glyphosate |
Senegal tea |
Craig Purvis on 027 555 4441 |
|
27 February 2026 - 20 March 2026 (weather permitting) |
Waikato Riverbank by Churchill East Road |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Alligator weed, Yellow flag iris |
Reuben Libline on 021 972 962 |
|
24 February 2026 - 17 March 2026 (weather permitting) |
Mangaonua Stream - Phillips Lane to Hoeka Road |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
24 February 2026 - 20 March 2026 (weather permitting) |
1589 State Highway 25 Tairua-Whitianga |
Knapsack, Gun and hose, Mist blower |
Metsulfuron |
Water Poppy |
Jack Hamilton on 022 852 0298 |
|
24 February 2026 - 20 March 2026 (weather permitting) |
Holland Close, Pauanui |
Knapsack |
Metsulfuron |
Alligator weed |
Jack Hamilton on 022 852 0298 |
|
24 February 2026 - 13 March 2026 (weather permitting) |
Waitomo Valley Road Pond |
Knapsack, Gun and hose |
Metsulfuron, Imazapyr, Glyphosate |
Purple loosestrife |
Frances McKinnon on 021 467 857 |
|
24 February 2026 - 13 March 2026 (weather permitting) |
Redwood Park Pond, Tainui & Rerenga Streets drain |
Knapsack, Gun and hose |
Metsulfuron, Imazapyr, Glyphosate |
Horsetail |
Frances McKinnon on 021 467 857 |
|
23 February 2026 - 13 March 2026 (weather permitting) |
Aotea Road, Aotea Harbor and Hikuparea Road, Kawhia Harbor |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
|
18 February 2026 - 4 March 2026 (weather permitting) |
Waimakariri and Waihou River, Okoroire |
Knapsack |
Haloxyfop, Glyphosate |
African feather grass |
Heidi Pene on 021 432 874 |
|
17 February 2026 - 10 March 2026 (weather permitting) |
Lower Waikato River, Ngaruawahia to Mercer |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
17 February 2026 - 22 February 2026 (weather permitting) |
Waihou River and Hikutaia Cut to Kopu |
Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
16 February 2026 - 9 March 2026 (weather permitting) |
Lake Whangape |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
9 February 2026 - 2 March 2026 (weather permitting) |
Kimihia Wetland, Huntly |
Helicopter |
Metsulfuron |
Yellow flag iris |
Craig Purvis on 027 555 4441 |
|
8 February 2026 - 1 March 2026 (weather permitting) |
Te Onetea Stream |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
5 February 2026 - 26 February 2026 (weather permitting) |
Pond on private property, Tauranga Road, Te Poi |
Knapsack |
Metsulfuron, Glyphosate |
Yellow flag iris |
Heidi Pene on 021 432 874 |
|
4 February 2026 - 27 February 2026 (weather permitting) |
Mangakaware Stream and Wetland |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
|
2 February 2026 - 20 February 2026 (weather permitting) |
Te Mata Stream and Opotoru River |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
29 January 2026 - 20 February 2026 (weather permitting) |
Woodside Estate ponds and drains near railway |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
2 February 2026 - 23 February 2026 (weather permitting) |
Waihou River riparian margin and stopbanks, Rangiora Road to Huirau Road Turua Thames |
Knapsack, Gun and hose |
Haloxyfop |
Manchurian wild rice |
Heidi Pene on 021 432 874 |
|
2 February 2026 - 16 February 2026 (weather permitting) |
Water poppy pond on private property Tauranga Road, Te Poi |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Water poppy |
Heidi Pene on 021 432 874 |
|
30 January 2026 - 5 February 2026 (weather permitting) |
Waihou River from Hikutaia Cut to Kopu |
Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
2 February 2026 - 20 February 2026 (weather permitting) |
Ruapuke Stream mouth, Toreparu Stream, Matauwai Stream mouth |
Knapsack, Gun and hose |
Metsulfuron, Glyphosate |
Alligator weed, Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
2 February 2026 - 23 February 2026 (weather permitting) |
Awaroa River |
Knapsack, Gun and hose |
Metsulfuron |
Senegal tea |
Reuben Libline on 021 972 962 |
|
27 January 2026 - 17 February 2026 (weather permitting) |
Whangamarino Wetland |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
27 January 2026 - 17 February 2026 (weather permitting) |
Mangaonua Stream - Phillip Lane to Hoeka Road |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
27 January 2026 - 9 February 2026 (weather permitting) |
Waikato River - Whirinaki Arm & Aratiatia Rapids downstream to Mihi bridge |
Knapsack, Mist blower |
Metsulfuron |
Yellow flag iris |
Eliah Murdoch-Pike on 021 318 195 |
|
26 January 2026 - 16 February 2026 (weather permitting) |
Lower Waikato River, Ngaruawahia to Mercer |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
19 - 31 January 2026 (weather permitting) |
Hamilton Gardens - Turtle Lake and Stream going to Gate 2 carpark |
Knapsack, Gun and hose |
Metsulfuron |
Mexican water lily |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Lake Rotokaeo |
Knapsack, Gun and hose |
Metsulfuron |
Yellow flag iris, Mexican water lily |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Lake Rotoroa / Hamilton Lake |
Knapsack, Gun and hose |
Metsulfuron |
Yellow flag iris, Mexican water lily |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Lincoln Street Drain to Kahikatea Road Drain |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Mangakotukutuku Stream, Peacockes |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Somerton Ponds and Kirikiriroa Stream - Thomas Road |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Stream at corner Gordonton-Puketaha Road |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
19 - 31 January 2026 (weather permitting) |
Stream near Wairere Drive, Logan Court, Milbrook Place |
Knapsack, Gun and hose |
Metsulfuron |
Alligator weed, Yellow flag iris |
Annemarie Robb on 021 284 9734 |
|
15 January 2026 - 22 January 2026 (weather permitting) |
Waihou River True left from Hikutaia cut to Kopu |
Gun and hose |
Haloxyfop |
Manchurian wild rice, Spartina |
Heidi Pene on 021 432 874 |
|
14 January 2026 - 4 February 2026 (weather permitting) |
Whangamaire Stream, Taupiri |
Knapsack |
Metsulfuron |
Yellow flag iris |
Reuben Libline on 021 972 962 |
|
12 January 2026 - 30 January 2026 (weather permitting) |
Lake Whangape |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Whangamarino Wetland |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
12 January 2026 - 30 January 2026 (weather permitting) |
Te Mata Stream and Opotoru River |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Yellow flag iris |
Frances McKinnon on 021 467 857 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Mangaonua Stream - Phillips Lane to Hoeka Road |
Knapsack, Mist blower |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Whangamarino Wetland |
Helicopter |
Metsulfuron |
Alligator weed |
Craig Purvis on 027 555 4441 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Waihou River Tirohia area |
Knapsack, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
Heidi Pene on 021 432 874 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Waihou River from the Ohinemuri River confluence to the Hikutaia Cut |
Knapsack, Mist blower |
Metsulfuron, Glyphosate |
Sagittaria |
Heidi Pene on 021 432 874 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Ohinemuri River from Paeroa to the Waihou River confluence |
Knapsack, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed, Sagittaria |
Heidi Pene on 021 432 874 |
|
5 January 2026 - 26 January 2026 (weather permitting) |
Lower Waikato River, Ngaruawahia to Mercer |
Mist blower |
Metsulfuron |
Alligator weed |
Philip Mabin on 021 502 099 |
|
5 January 2026 - 23 January 2026 (weather permitting) |
Mangaonua Street east of Hoeka Road |
Knapsack, Gun and hose, Mist blower |
Metsulfuron, Glyphosate |
Alligator weed |
Frances McKinnon on 021 467 857 |
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 |
|---|---|---|---|---|
| 24 December 2025 - 14 January 2026 (weather permitting) | Whangamaire Stream, Taupiri | Knapsack | Metsulfuron | Yellow flag iris |
| 24 December 2025 - 14 January 2026 (weather permitting) | Komakorau Stream | Knapsack | Metsulfuron | Alligator weed, Yellow flag iris |
| 18 December 2025 - 24 December 2025 (weather permitting) | Te Poi pond on private property | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Water poppy |
| 18 December 2025 - 24 December 2025 (weather permitting) | Wetland on private property SH26 Puriri | Knapsack, Gun and hose | Haloxyfop | Manchurian wild rice |
| 16 December 2025 - 24 December 2025 (weather permitting) | Mangaonua Stream - East of the Hoeka Road | Knapsack, Gun and hose, Mist blower | Metsulfuron, Glyphosate | Alligator weed |
| 12 December 2025 - 24 December 2025 (weather permitting) | Lake Whangape | Knapsack, Gun and hose | Metsulfuron, Triclopyr | Cuscuta |
| 11 December 2025 - 24 December 2025 (weather permitting) | Ruahorehore Stream, Waihi | Knapsack | Metsulfuron | Alligator weed |
| 10 December 2025 - 24 December 2025 (weather permitting) | Mackay Town pond on private property | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Alligator weed |
| 5 December 2025 - 24 December 2025 (weather permitting) | Riverbank by Hakarimata Road | Knapsack, Gun and hose | Metsulfuron | Alligator weed, Yellow flag iris |
| 5 December 2025 - 24 December 2025 (weather permitting) | Huntly ponds by Tainui Bridge | Knapsack, Gun and hose | Metsulfuron | Alligator weed, Yellow flag iris |
| 5 December 2025 - 19 December 2025 (weather permitting) | Morrinsville Golf Course ponds | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Mexican water lily |
| 5 December 2025 - 23 December 2025 (weather permitting) | Puketutu Road Matamata, private pond | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Mexican water lily |
| 5 December 2025 - 23 December 2025 (weather permitting) | Pukekauri Road Waikino, private pond | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Mexican water lily |
| 4 December 2025 - 22 December 2025 (weather permitting) | Waihou River from the Ohinemuri River confluence to the Hikutaia Cut | Knapsack, Mist blower | Metsulfuron, Glyphosate | Alligator weed, Spartina, Sagittaria |
| 3 December 2025 - 24 December 2025 (weather permitting) | Lake Waikare | Knapsack, MIst blower | Metsulfuron | Alligator weed |
| 3 December 2025 - 24 December 2025 (weather permitting) | Mangaonua Stream | Knapsack | Metsulfuron | Alligator weed |
| 4 December 2025 - 22 December 2025 (weather permitting) | Ohinemuri River from Paeroa Township to the Waihou River confluence | Knapsack, Mist blower | Metsulfuron, Glyphosate | Alligator weed, Sagittaria |
| 4 December 2025 - 18 December 2025 (weather permitting) | Waihou River Tirohia | Knapsack, Mist blower | Metsulfuron, Glyphosate | Alligator weed |
| 3 December 2025 - 24 December 2025 (weather permitting) | Waitetuna Ponds | Knapsack | Metsulfuron | Yellow flag iris |
| 2 December - 7 December 2025 (weather permitting) | Waihou River True left - Hikutaia Cut to Kopu | Gun and hose | Haloxyfop | Manchurian wild rice, Spartina |
| 1 December 2025 - 25 December 2025 (weather permitting) | Lake Rotokaeo - Minogue Park, Turtle Lake - Hamilton Gardens | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 1 December 2025 - 25 December 2025 (weather permitting) | Lake Rotoroa | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 1 December 2025 - 25 December 2025 (weather permitting) | Stream near Wairere Drive, Logan Court, Milbrook Place | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 1 December 2025 - 25 December 2025 (weather permitting) | Lincoln Street drain to Kahikatea Road drain | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 1 December 2025 - 25 December 2025 (weather permitting) | Stream, corner Gordonton-Puketaha Road | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 1 December 2025 - 25 December 2025 (weather permitting) | Somerton Ponds & Kirikiriroa Stream - Thomas Road | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 1 December 2025 - 25 December 2025 (weather permitting) | Managakotukutukutu Stream | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 2 December 2025 - 22 December 2025 (weather permitting) | Lower Waikato River, Pukete to Whangape Stream, Waipa River, Ngaruawahia to Bedford Road. | Mist blower | Metsulfuron | Alligator weed |
| 1 December 2025 - 21 December 2025 (weather permitting) | Aotea Harbor - Aotea Road, Kawhia Harbor - Hikuparea Road | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Alligator weed, Yellow flag iris |
| 1 December 2025 - 21 December 2025 (weather permitting) | Matauwai Stream mouth, Toreparu Stream mouth, Ruapuke Stream mouth, Wainui Stream | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Alligator weed, Yellow flag iris |
| 27 November 2025 - 19 December 2025 (weather permitting) | TM Station Drain, Tauhua Stream, Turiakina Stream mouth | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Alligator weed, Yellow flag iris |
| 20 November 2025 - 24 December 2025 (weather permitting) | 1589 State Highway 25 Tairua | Knapsack, Gun and hose, Mist blower | Metsulfuron | Water poppy |
| 19 November 2025 - 24 December 2025 (weather permitting) | Holland Close Pauanui | Knapsack | Metsulfuron | Alligator weed |
| 20 November 2025 - 11 December 2025 (weather permitting) | Wilcox pond and stream, Pukekawa | Knapsack, Gun and hose | Metsulfuron | Alligator weed |
| 20 November 2025 - 11 December 2025 (weather permitting) | Huntly Ash Ponds | Knapsack, Gun and hose | Metsulfuron | Alligator weed, Yellow flag iris |
| 19 November 2025 - 10 December 2025 (weather permitting) | Waikato River true left north of Rangiriri bridge | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris |
| 18 November 2025 - 9 December 2025 (weather permitting) | Te Aroha Pooles Road drain | Knapsack | Metsulfuron | Alligator weed, Yellow flag iris |
| 13 November 2025 - 4 December 2025 (weather permitting) | Waihi Township - Mill Creek stream - Kent Street to Clarke Street | Knapsack | Metsulfuron | Yellow flag iris |
| 10 November 2025 - 1 December 2025 (weather permitting) | Puketutu Road Matamata, pond on private property | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Mexican water lily |
| 10 November 2025 - 1 December 2025 (weather permitting) | Pukekauri Road Pond on private property | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Mexican water lily |
| 10 November 2025 - 1 December 2025 (weather permitting) | Morrinsville Golf Course Lake | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Mexican water lily |
| 10 November 2025 - 28 November 2025 (weather permitting) | Paratawa Stream - Old Mountain Road | Knapsack, Gun and hose, Mist blower | Metsulfuron, Glyphosate | Yellow flag iris |
| 10 November 2025 - 28 November 2025 (weather permitting) | Mangakawera Lake and Stream | Knapsack, Gun and hose | Metsulfuron, Glyphosate | Yellow flag iris |
| 6 November 2025 - 26 November 2025 (weather permitting) | Lower Waikato River, Pukete to Mercer | Mist blower | Metsulfuron | Alligator weed |
| 3 November 2025 - 21 November 2025 (weather permitting) | Tuhikaramea Stream | Knapsack, Gun and hose, Mist blower | Metsulfuron, Glyphosate | Yellow flag iris |
| 3 November 2025 - 8 November 2025 (weather permitting) | Waihou River true right between the Hikutaia cut and Kopu | Gun and hose | Haloxyfop | Manchurian wild rice, Spartina |
| 30 October 2025 - 20 November 2025 (weather permitting) | Port Waikato to Tauranganui, Tauranganui to Tuakau Bridge | Drone | Metsulfuron | Alligator weed, Senegal tea |
| 27 October 2025 - 17 November 2025 (weather permitting) | Rutherfurd and Tahuna Road drains and Matahuru Stream | Knapsack, Gun and hose | Metsulfuron | Alligator weed |
| 23 October 2025 - 13 November 2025 (weather permitting) | Pond on private property Mackay Town, Paeroa | Knapsack | Metsulfuron, Glyphosate | Alligator weed |
| 20 October 2025 - 10 November 2025 (weather permitting) | Te Poi Stream private property SH 29 | Knapsack | Metsulfuron | Yellow flag iris |
| 20 October 2025 - 3 November 2025 (weather permitting) | Maungahaumia Stream from Matuku Road to Morrinsville-Tahuna Road | Knapsack | Metsulfuron | Yellow flag iris |
| 20 October 2025 - 3 November 2025 (weather permitting) | Te Aroha Pooles Road drain | Knapsack | Metsulfuron | Alligator weed, Yellow flag iris |
| 22 October 2025 - 12 November 2025 (weather permitting) | Te Otamanui Lagoon | Helicopter, Knapsack, Mistblower | Metsulfuron, Triclopyr, Glyphosate | Alligator weed |
| 20 October 2025 - 20 November 2025 (weather permitting) | Hall Road Wetland | Knapsack, Mistblower | Metsulfuron | Alligator weed, Mexican water lily |
| 20 October 2025 - 10 November 2025 (weather permitting) | Mangakaware Lake & Stream | Knapsack, Gun and hose, Mistblower | Metsulfuron, Glyphosate | Yellow flag iris |
| 15 October 2025 - 30 October 2025 (weather permitting) | Pukerimu lane ponds and Tuhikaramea stream | Knapsack, Mistblower | Metsulfuron, Glyphosate | Yellow flag iris |
| 16 October 2025 - 5 November 2025 (weather permitting) | Horotiu to Whangape stream | Mistblower | Metsulfuron | Alligator weed |
| 6 October 2025 - 24 October 2025 (weather permitting) | 208 Te Puroa Road, Ngaruawahia | Knapsack | Metsulfuron | Yellow flag iris |
| 6 October 2025 - 24 October 2025 (weather permitting) | Paratawa Stream, Old Mountain Road | Knapsack | Metsulfuron | Yellow flag iris |
| 6 October 2025 - 24 October 2025 (weather permitting) | Pond and Stream at Pirongia Road | Knapsack | Metsulfuron | Yellow flag iris |
| 6-24 October 2025 (weather permitting) | Pond at Raynes Road, Rukuhia | Knapsack | Metsulfuron | Yellow flag iris |
| 22 September 2025 - 13 October 2025 (weather permitting) | Murphy Lane Wetland, Taupiri | Knapsack | Metsulfuron | Yellow flag iris |
| 19 September 2025 - 7 October 2025 (weather permitting) | Mangakotukutuku Road, Kirikiriroa Stream and Somerton Ponds | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris, Mexican water lily |
| 19 September 2025 - 7 October 2025 (weather permitting) | Wairere Drive Stream, Gordonton and Puketaha Road, Lake Rotokaeo | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris, Mexican water lily |
| 19 September 2025 - 7 October 2025 (weather permitting) | Lincoln Street Drains, Lake Rotoroa, Hamilton Gardens Turtle Lake | Knapsack, Gun and hose, Mist blower | Metsulfuron | Alligator weed, Yellow flag iris, Mexican water lily |
| 16 September - 7 October 2025 (weather permitting) | Lower Waikato River, Ngaruawahia to Mercer, Waipa | Mist blower | Metsulfuron | Alligator weed |