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Weed find sparks regional search

MEDIA RELEASE


Weed find sparks regional search

For immediate release: Thursday 27 April 2006

An extremely rare but toxic weed found growing in two paddocks near Tauranga has sparked a region-wide search and a call for help by Environment Bay of Plenty.

Until now, Noogoora bur (Xanthium strumarium) was thought practically eradicated in New Zealand. The plant, with its clingy hooked burs, has only had two officially recorded infestations over the past few decades. These were in Matamata and north of Wellington. It has never been found in the Bay of Plenty before.

Environment Bay of Plenty staff are now investigating two independent infestations discovered in the same week but located several kilometres apart.

Pest plant coordinator John Mather says the weed must not be allowed to take hold in the Bay of Plenty. “We are asking people to look out for it and call us if they think they’ve seen this plant,” he says.

Noogoora bur is an erect, summer growing annual that usually grows to about one and a half metres high, though it can grow to three metres high. It can grow as a plant with an erect single stem or as a much-branched spreading plant. It has a different leaf shape and grows far higher than the relatively common Bathurst bur. At seedling stage, its leaves are toxic to most livestock. It can cause contact allergy and dermatitis to both humans and animals.

A Papamoa maize grower reported the first incident early in April. He wanted advice on a difficult to control weed scattered through his 4ha maize field, Mr Mather says. The grower initially thought it was the closely related Bathurst bur. That same week, regional council staff discovered a smaller infestation of 12 plants alongside another maize field in Bethlehem.

Environment Bay of Plenty staff immediately implemented a management plan, inspecting adjacent properties and nearby drains at both locations. They hand-removed and incinerated the Bethlehem plants and are now doing the same for those growing at the larger site. Mr Mather has also tracked the maize harvested from both fields to ensure the weed does not spread further. This work has involved Environment Waikato, which will inspect a maize company depot near Hamilton as well as their local landfill. “It is vital that we do not allow this weed to get away from us,” Mr Mather says.

Mr Mather says the infestations involve different maize growers and appear to be unrelated. “It has been a very unusual coincidence. We will also investigate the source of the maize seed, especially that imported from overseas.” He asks people who may have seen Noogoora bur to call him on 0800 ENV BOP (368 267).


Click for big version

Have you seen this weed? Noogoora bur has burs with hooked spines, which cling firmly to wool or fur, bags and clothing.

ENDS

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