Category Archives: hornwort

Weed control helps lakes

Posted June 2013
A nationwide lake weed control programme carried out by Land Information New Zealand is having a positive impact on the health of some of Otago’s lakes, particularly Lake Wanaka.
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Posted in Ceratophyllyum, divers, hand-pulling, herbicide control, hornwort, lagarosiphon, suction | Comments Off on Weed control helps lakes

Pest water weed eradicated from South Island

Posted June 2013
The Ministry for Primary Industries (MPI) today confirms that the invasive aquatic weed hornwort has been eradicated from the South Island. Hornwort was found in the Timaru lake in 2006 and was treated with the aquatic herbicide endothall in 2008.
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Posted in Ceratophyllum demersum, chemical control, endothal, herbicide, hornwort | Comments Off on Pest water weed eradicated from South Island

Gore District Council seeks more information on herbicide

Posted January 2013
The Gore District Council is seeking more information about an application by the Ministry of Primary Industries to use the aquatic herbicide Endothall in Southland. The ministry earlier this year sought resource consent for a 30-year approval to use Endothall to eradicate aquatic pests Hydrilla, Lagarosiphon and Hornwort, should they become a problem in Southland’s waters.
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Caged grass carp effective against aquatic weeds – study

Posted September 2012
A Ministry for Primary Industries trial has found grass carp kept in enclosures are effective in eliminating early infestations of aquatic weeds.

As part of the trial, six 2.5 metre by six metre cages were placed in beds of hornwort weed in Lake Karapiro.

Within nine weeks, the three to five fish contained in each cage had removed the weed.

MPI senior adviser Andrew Bell says once the hornwort was eradicated, the fish and the enclosures were removed safely.

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Weed discovery puts boaties on alert

Posted May 2012
Hornwort, also known as
coontail, is highly invasive.
Picture courtesy of NIWA.
(Scoop.co.nz)

Source: Scoop.co.nz (New Zealand)
Date Published: 05/14/2012

An invasive aquatic weed has been found in Lake Rotorangi, prompting a request for recreational users of the lake to help prevent it spreading.

Boats and other equipment should be well cleaned before departing Lake Rotorangi to help prevent the spread of hornwort, also known as coontail.

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Aquatic pest found in Lake Okareka

Posted May 2012
An infestation of the aquatic pest plant hornwort has been found in Rotorua’s Lake Okareka. The invasive weed, which has not been seen in Lake Okareka before, was found by the skipper of the Duck tourist vehicle last month.

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