Effective pest management depends on collaboration. We consult with a range of interested groups when planning control programmes, including neighbouring landowners, district and regional councils, iwi, advocacy groups, and the local community.
Before undertaking any control work, we notify the public by:
- putting up signs near the affected area
- publishing notices in local newspapers
- posting information on this website.
Most of our control work is weather dependent, so advertised dates may change at short notice. We try to avoid carrying out any spraying on weekends or during public holidays.
We publish tables below with detailed information about recent aquatic weed control work. You can find more information about all our biosecurity programmes on the page Biosecurity control work.
Operational spray plans
Lakeweed spraying public notification protocols
Lake Benmore
No upcoming control works currently scheduled.
Lake Dunstan
No upcoming control works currently scheduled.
Lake Karapiro
Control site
| Safe to swim at, gather food from, or take water for irrigation or domestic purposes?
| Scheduled date of control
| Actual date of treatment
|
|---|---|---|---|
| Horahora Domain | Yes - as of 19 November 2025 | TBC | TBC |
| Lake Karāpiro/Mighty River Domain | Yes - as of 19 November 2025 | TBC | TBC |
| Little Waipa Reserve | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 3 | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 4 | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 5 | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 6 | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 7 | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 9 | Yes - as of 19 November 2025 | TBC | TBC |
| Navigation Safety Zones 12 | Yes - as of 19 November 2025 | TBC | TBC |
Lake Ōkāreka
| Control site | Safe to swim at, gather food from, or take water for irrigation or domestic purposes? | Scheduled date of control | Actual date of treatment |
|---|---|---|---|
| Southern Outlet | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | TBC |
Lake Ōkataina
| Control site | Safe to swim at, gather food from, or take water for irrigation or domestic purposes? | Scheduled date of control | Actual date of treatment |
|---|---|---|---|
| Tauranganui Bay (weed cordon) | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | TBC |
Lake Rerewhakaaitu
No upcoming control works currently scheduled.
Lake Rotoehu
No upcoming control works currently scheduled.
Lake Rotoiti
Control site
| Safe to swim at, gather food from, or take water for irrigation or domestic purposes?
| Scheduled date of control
| Actual date of treatment
|
|---|---|---|---|
| Gisborne Point/Punawhakareia Bay | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | 26 November 2025 |
| Ōkahutoroa Bay/Cherry Bay | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | TBC |
| Ōkawa Bay | No – as at 3 December 2025 | 2 December 2025 | 2 December 2025 |
| Te Weta Bay | No – as at 3 December 2025 | 2 December 2025 | 2 December 2025 |
| Te Tī Bay | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | 27 November 2025 |
| Ōtaramarae Boat Ramp | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | 27 November 2025 |
| Ōkere Inlet | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | TBC |
| Kakaho Bay | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | 27 November 2025 |
| Teal Bay | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | 27 November 2025 |
| Wairau Bay | No – as at 3 December 2025 | 2 December 2025 | 2 December 2025 |
Lake Rotomā
No upcoming control works currently scheduled.
Lake Tarawera
| Control site | Safe to swim at, gather food from, or take water for irrigation or domestic purposes? | Scheduled date of control | Actual date of treatment |
|---|---|---|---|
| Otumutu Lagoon | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | TBC |
| Punaromia/The Landing | Yes – as at 3 December 2025 | 24 November – 19 December 2025 | TBC |
Lake Wānaka
No upcoming control works currently scheduled.
Kawarau River
No upcoming control works currently scheduled.