ERMA New Zealand has approved the import for release of two moth species to control the pasture weed ragwort.
The moths Cochylis atricapitana (ragwort crown borer) and Platyptilia isodactyla (ragwort plume moth) were approved for release on December 15.
Decision Making Chairperson Max Suckling said the larvae control ragwort by burrowing into the crown and developing stem of ragwort, which stunts plant growth, reduces seed production and in severe cases causes the plant to die.
"When the Authority considered the application we took into account that tests from overseas and New Zealand showed that the moths targeted ragwort and that there was little chance of the moth establishing on native plants."
Dr Suckling said that the Authority has taken into consideration all risks, costs and benefits before making a decision and this includes information gained through public submissions and consultation with iwi groups
He said that the biological control of ragwort is successful in most parts of New Zealand following the release of the ragwort flea beetle, Longitarsus jacobaeae, in 1983. However, there are parts of the country where the flea beetle has not established, or performed poorly - like the West Coast.
"The West Coast Ragwort Control Trust applied to bring in the moths as they are expected to succeed in the wetter West Coast regions where they will initially be released."
Dr Suckling says that for farmers the introduction of the moths should mean a reduction in herbicide use and costs involved with the control of ragwort. This should amount to significant economic benefit for the farmers affected.
The final decision document is available on the ERMA New Zealand website
For further information contact Katherine O'Sullivan, Senior Public Awareness Advisor, ERMA New Zealand
- Telephone +64 4 918 4809
- Mobile 027 3081588
- Facsimile +64 4 914 0433
- Website: www.ermanz.govt.nz
Email: info@ermanz.govt.nz