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:

View our references here

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