Intensive strike against spring pest butterfly surge

The Department of Conservation is geared up to mount an intensive strike against a great white butterfly spring breeding surge and is again asking Nelson Tasman residents for help in clearing the pest butterfly from the region and New Zealand.

DOC has set up a dedicated team, numbering up to 25, to carry out concentrated searching of gardens to look for and remove great white butterfly caterpillars and eggs.

The pest butterfly poses a major threat to home and commercial brassica crops and endangered native cresses.

Already this spring, 71 egg clusters have been found and 70 adult butterflies have been killed.

The support of local people is essential to the DOC-led programme to eradicate the great white butterfly in Nelson Tasman.

Householders are asked to look for the butterfly’s caterpillars and eggs in their gardens and report any found to the Ministry for Primary Industries (MPI) hotline 0800 80 99 66. The caterpillars and eggs can be found in clusters on its favoured plants which include nasturtium, honesty and brassica vegetables such as broccoli, cabbage and cauliflower.

The tiny, yellow eggs are found in clusters of 30 to 100. Young caterpillars are also tiny and are yellowish with a shiny black head. The larger caterpillars are speckled greenish-yellow and black with three yellow lines along their bodies and they grow to about 50 mm in length.

DOC is also asking the public to help kill great white butterflies. Female butterflies can lay as many as 750 eggs so killing butterflies helps prevent their numbers increasing and the butterfly spreading to new areas.

People taking trailers, boats and caravans out of the Nelson Tasman region are asked to check no great white butterfly pupae are on board before they leave home. Any pupae found should be reported to the MPI hotline 0800 80 99 66 and removed before leaving to avoid spreading the pest butterfly to new locations.

Large patches of overgrown nasturtium can become butterfly breeding hotspots and these are being cleared where possible. DOC is asking householders to remove or cut back nasturtium. If people don’t want to remove nasturtium plants they are asked to keep checking them for caterpillars and eggs and report any found to the MPI hotline 0800 80 99 66.

People are asked to report large patches of overgrown nasturtium to the DOC great white butterfly eradication team, ph (03) 546 3147 or email This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Project Manager Bruce Vander Lee said knocking back the pest butterfly’s breeding spikes in spring and autumn was critical to achieving its eradication.

‘We put in an intensive effort against a great white butterfly autumn breeding spurt, searching out and removing infestations, and we are hoping as a result there will be fewer butterflies to set off its spring breeding burst. But that will be determined in how many infestations our field staff find and the public report to us in coming weeks.

‘Many Nelson Tasman residents will be out in their gardens tending to plants over spring. We are asking them to keep watch for great white butterfly caterpillars and eggs.

‘Leaves being rapidly chewed away on plants could be a telltale sign they are being attacked by the mob-feeding caterpillars that can quickly demolish plants.

‘We have had great support from the Nelson Tasman community so far and working together we have a chance of clearing this pest from our region and stopping it becoming a permanent, widespread major pest in New Zealand.’

Garden searches by the eradication team this spring are initially focussed on Nelson city where most infestations occur.

Householders in Richmond and in Tasman should also watch for butterfly infestations as the butterfly can fly to new locations. Infestations were found in Richmond for the first time last summer.

When infestations are found or reported, field staff remove the caterpillars and eggs, mostly by hand. Searches are carried out of neighbouring properties as they could also have infestations. Because the butterfly flies around, repeat visits to properties are needed to check for new infestations.

DOC launched the great white butterfly eradication programme in November last year. Agencies supporting it include MPI, Nelson City Council, Tasman District Council and Vegetables New Zealand.

Eradication team field staff have carried out over 28,000 garden searches since November and 850 butterfly infestations have been found and removed since it was first discovered in a Nelson city garden in 2010.

Over winter, a smaller field team searched for the hibernating pupae and also removed any caterpillars and eggs found that survived the colder conditions.


Black Grass Seed Spilled in Canterbury

Grass seed spilled from a truck travelling between Ashburton and Methven has been found to include black grass or meadow foxtail. This grass is resistant to many herbicides and should it become established would pose a real threat as it competes for nutrients, light, water and space, out-competing crops and reducing yields.

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Men Accused of Smuggling Scorpions into NZ

Four men will appear in court for allegedly smuggling scorpions into the country, following an investigation by the Ministry for Primary Industries.

The group are charged with various breaches to the Biosecurity Act 1993 after six Black Rock Scorpions (Urodacus manicatus) were allegedly smuggled from Australia through Christchurch International Airport and then into Queenstown.

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Exotic threat found near Lake Taupo

The discovery of a red-eared slider turtle in Lake Taupo has prompted a warning for pet owners not to release the species into the wild.

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Pestbusters Put the Train into Training


by Chris Macann

A train full of biosecurity professionals has seen at first-hand the beauty of the Selwyn district as well as some of the challenges involved in keeping the area’s weeds and pests down.

More than 200 scientists, practitioners and policy-makers involved in biosecurity took part in the New Zealand Biosecurity Institute’s annual training get together, which was held onboard the TranzAlpine train and at Shantytown near Greymouth on the weekend.Co-organiser Hugh Gourlay said as the train travelled from Christchurch to Greymouth, the attendees discussed and saw first-hand some of the biosecurity issues which confront Canterbury and the West Coast.

“Just as importantly they got to see why this part of the country is worth protecting from invasive plants and animals,” he said.

“Among the issues noticeable on the Selwyn side of the Alps were the spread of wilding pines in the Craigieburn Basin as well as the infestation of broom in the Springfield area, both of which, members of the Institute are tackling on many fronts.”

Mr Gourlay said the visitors were also interested to see the change of land use from pastoral to dairying and how that might bring a change in weed behaviour in the future.


Weedbusters Lincoln resident Kevin Gallagher points out a few landmarks to
Alice McNatty from Hawkes Bay, while Woody Weed, the mascot of nationwide
weed-busting group Weedbusters, looks on.


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