Wednesday, 04 March 2020 10:51

Invasive weed water hyacinth found in Waikato River 

Written by  Staff Reporters
Water hyacinth. Image: Biosecurity New Zealand. Water hyacinth. Image: Biosecurity New Zealand.

An invasive weed that can reduce water quality and block irrigation systems has been discovered in the Waikato River.

A joint Biosecurity New Zealand and Waikato Regional Council work programme is now underway to remove the small cluster of the pest water hyacinth in the river near Huntly.

The agencies are working together with local iwi to ensure any water hyacinth present is located and safely removed. The team will then coordinate ongoing checks to make sure it hasn't come back.

Biosecurity New Zealand's manager of pest management, John Sanson, says water hyacinth is a rapidly growing water weed that if left, can form dense mats that reduce water quality, crowd out native water plants and animals, block irrigation systems and alter ecosystems.

"In this instance, we've found just 2 individual plants in the slow waters at the edges of the river and 1 plant in a cluster of willows further out into the stream.

"The plants have clearly come from a container of water hyacinth being kept at a private property in Huntly backing onto the river. This container was close to a drain next to the river bank and we believe that's how the plants entered the waterway."

Sanson says all known plants have been removed from the water and inspections have found no further sign of the weed.

However, as a precaution, a more comprehensive survey is taking place today, using a boat supplied by the council harbour master. 

It is illegal to sell, propagate or distribute water hyacinth. Those who may have seen the pest can call Biosecurity New Zealand’s pests and diseases hotline on 0800 80 99 66.

More like this

$2.4m for fruit fly operation

Biosecurity New Zealand Commissioner, North, Mike Inglis says the $2.4 million cost of a recent biosecurity operation in South Auckland is small compared to the potential economic impact of an incursion.

Fruit fly discovery 'concerning'

Horticulture New Zealand (HortNZ) says that discovery of a male Oriental fruit fly on Auckland’s North Shore is a cause for concern for growers.

Velvetleaf a real risk to crops

Any farmer that harvests or buys crops risks inviting one of the world's most invasive pest plants onto their property - to their detriment.

Rise in fall armyworm numbers

Populations of fall armyworm are two to three weeks more advanced than they have been in previous seasons, bringing calls for maize and sweetcorn growers to scout their crops as often as possible.

Featured

Court decision a win for Southland farmers

Federated Farmers says it welcomes a recent court decision which granted a stay on rules in the Southland Water and Land Plan until legislative changes can be made by government.

National

Machinery & Products

Alpego eyes electric power harrow

Distributed by OriginAg in New Zealand, Italian manufacturer Alpego recently showed its three metre Alysium electric power harrow at the…

New seed drill tech coming

Incorporating Vaderstad's latest seed drill technology, the Proceed V 24, is said to improve precision and increase planting efficiencies for…

» Latest Print Issues Online

The Hound

Waffle man

OPINION: Prime Minister Christopher Luxon sometimes can't escape his own corporate instinct for evasion, and in what should have been…

Banks on notice

OPINION: Shane 'Matua' Jones, crusader against all things woke, including "woke banks", couldn't have scripted it better when his NZ…

» Connect with Rural News

» eNewsletter

Subscribe to our weekly newsletter