River Spraying Schedule

Wednesday 11 January 2017

This page lists current river-based weed spraying operations in the Tasman District.

Current Operations - January

Please note that activities are weather dependent and can change at short notice. Contractors should notify you ahead of time if your property is affected by these works.


Wai-iti River

Brightwater to Belgrove  

Starting at the Waimea River confluence and working upstream.  

Control of chocolate vine, Old Man's Beard on the banks and woody weeds such as wilding willows and broom growing within the channel.

Sherry River

Upper Motueka area

Starting at the upstream end where the river meets the Pine forest at Slippery Stream. 

Control of Old Man's Beard, Asian knot weed and other climbing pests on the banks.

About the Operations

  • The above information is indicative only. Spraying operations are highly weather dependent and conditions can change rapidly requiring a flexible approach to timing and locations. Weed control is only undertaken between Monday and Friday and not on public holidays.
  • Our contractor is required to contact all landowners adjacent to any river areas being sprayed ahead of time.
  • Spraying within river channels can only be undertaken between November-April inclusive due to resource consent requirements.
  • Spraying or other chemical weed control in riparian areas can occur at any time of year, but will almost aways be undertaken only during the growing season.

Agrichemicals Used and Method of Operation:

Typical herbicides used are glyphosate (i.e. Roundup), metsulfuron (i.e. Escort) and Triclopyr BEE (i.e. Grazon) along with an organo-silicone penetrant.

These are governed by the resource consent Council holds for this activity. When using herbicides in riparian areas above the flood channel a wider range of chemicals may be used. A red dye is used to make it obvious areas have been sprayed, and signage is used where there is a chance of the public inadvertently entering the area.

Weed control can be by manual methods using a backpack sprayer or cutting and painting, or by motorised methods using a vehicle mounted pressure sprayer. Boom spraying is able to be undertaken and helicopter spraying can also be carried out from time to time.