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Aquatic Weed Control

LAGAROSIPHON

Scientific Name: Lagarosiphon major 

Description: Lagarosiphon is a rhizomatous, perennial, submerged aquatic herb with spiralled leaves on slender to almost woody stems. It has tiny pink flowers in summer. The leaves of Lagarosiphon curl right back on themselves.

Problem: Lagarosiphon is currently found in several South Island Lakes including Lakes Dunstan, Benmore and Wanaka. It forms dense beds that smother other aquatic vegetation and often becomes surface reaching. Lagarosiphon can inhibit recreation activities such as swimming, fishing and will often cause difficulties with boat launching. Large rafts of Lagarosiphon can break off from wind and wave action and wash up onshore. As it dries this can become smelly and unsightly.


HORNWORT 

Scientific Name: Ceratophyllum demersum 

Description: Hornwort is a submerged freshwater weed found in still and flowing waters, growing to depths of 16 m in clear deep lakes. Leaves are finely divided, with minute teeth which make the plant feel rough to the touch. It lacks roots but has modified leaves that anchor the plant in bottom sediments. 

Problem: Hornwort is currently found in many North Island areas but thus far has been prevented from establishing in the South Island. It forms dense beds that smother other aquatic vegetation and usually becomes surface reaching in autumn before dying back again over winter. Hornwort can inhibit recreation activities such as swimming, fishing and will often cause difficulties with boat launching. Large rafts of Hornwort can break off from wind and wave action and wash up onshore. As it dries it can become smelly and unsightly. 



Amuri Helicopters has previously carried out aquatic weed control under the following resource consents and has been fully compliant:


Consent Number  Region Consent Details Details of Control
Carried Out
CRC040810 Canterbury To discharge contaminants (diquat) into water in Lakes Benmore, Aviemore, Waitaki and connecting waterways Lagarosiphon control in the Ahuriri Arm of Lake Benmore
CRC084253 Canterbury To discharge contaminants (diquat, endothall and rhodamine WT tracer dye) into water in various riverbeds and lakebeds in the Waitaki System Lagarosiphon control in the Ahuriri Arm of Lake Benmore
STRG-06-03-2009-001 Canterbury ERMA permission to use of Aquathol K and Aquathol Super K for the control of Lagarosiphon and other aquatic pest plants Lagarosiphon control in the Ahuriri Arm of Lake Benmore
2007.339 Otago To discharge Intracid Rhodamine WT Liquid tracer dye into water bodies within theOtago region Monitoring of water movement prior to Lagarosiphon control in Lake Dunstan
023763 Bay of Plenty A permit to discharge herbicides containing the active ingredient diquat, and/or glyphosate onto and into the Rotorua lakes Lagarosiphon control in lake Rotorua
113885 Waikato Discharge diquat into/onto and over Lake Karapiro and its margins, for weed control purposes between Karapiro Dam and Little Waipa Domain Hornwort control in Lake Karapiro

Date Target  Weed Operation
December 2001 Lagarosiphon Lake Rotorua Aquatic weed control
December 2001 Lagarosiphon Lake Dunstan Aquatic weed control
December 2002 Lagarosiphon Lake Rotorua Aquatic weed control
December 2002 Lagarosiphon Lake Dunstan Aquatic weed control
March 2003 Lagarosiphon Lake Dunstan Aquatic weed control
March 2003 Lagarosiphon Ahuriri Delta Aquatic weed control
November 2003 Lagarosiphon Lake Dunstan Aquatic weed control
March 2004 Lagarosiphon Lake Dunstan Aquatic weed control
March 2004 Lagarosiphon Lake Benmore Aquatic weed control
December 2004 Lagarosiphon Lake Dunstan Aquatic weed control
December 2004 Lagarosiphon Lake Wanaka Aquatic weed control
January 2005 Lagarosiphon Ahuriri Delta Aquatic weed control
November 2005 Lagarosiphon Ahuriri Delta Aquatic weed control
November 2005 Lagarosiphon Lake Dunstan Aquatic weed control
December 2006 Lagarosiphon Lake Dunstan Aquatic weed control
February 2007 Lagarosiphon Ahuriri Delta Aquatic weed control
May 2007 Lagarosiphon Paddock Bay – Lake Wanaka
May 2007 Hornwort
September 2007 Hornwort Lake Karapiro Aquatic weed control
August 2007 Lagarosiphon Lake Wanaka Aquatic weed control
September 2007 Lagarosiphon Lake Dunstan Aquatic weed control
November 2007 Lagarosiphon Ahuriri Delta Aquatic weed control
May 2008 Lagarosiphon Lake Wanaka Aquatic weed control
May 2008 Lagarosiphon Lake Dunstan Aquatic weed control
May 2008 Lagarosiphon Ahuriri Delta Aquatic weed control
May 2008 Hornwort Lake Karapiro Aquatic weed control
January 2009 Hornwort Waikato Lakes – Mighty River Power
February 2009 Lagarosiphon Lake Dunstan Aquatic weed control
February 2009 Lagarosiphon Ahuriri Delta Aquatic weed control
May 2009 Hornwort Lake Karapiro Aquatic weed control
June 2009 Lagarosiphon Lake Wanaka Aquatic weed control



Aquatic Weed Control
AS350 FX2 Aquatic Weed Control
Aquatic Weed Control
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