Media Release
New insect to patrol apple orchards
Hawkes Bay, New Zealand. 1 November 2012...New Zealand pipfruit growers are enhancing their management options for one
of the key pests for the pipfruit industry – the codling moth – with the release of a new biocontrol agent.
Plant & Food Research scientists, with support from Pipfruit New Zealand, have been investigating the potential for Mastrus
ridens, a small parasitoid wasp, to control the codling moth, one of the major pests affecting the New Zealand pipfruit
industry. Following EPA approval, field appraisal will take place over the next few years to measure the effectiveness
of the wasp as a long term biological control agent. The first release in commercial orchards, of 1,000 individuals, has
been/will be made in Hawke’s Bay today/this week.
“Codling moth is a major issue for the pipfruit industry, with control of the pest costing between $8 and $12 million
each year,” says Mike Butcher, Technical Manager of Pipfruit New Zealand. “Whilst the presence of a single moth in a
shipment can impact on market access for all New Zealand apple exports to codling moth sensitive markets, the industry
is also focused on reducing the use of chemical pesticides. This ultimately means we must find new ways to control
pests, and the introduction of the Mastrus wasp as a biological control agent is an important new component to our
system that currently includes mating disruption, a codling moth specific virus and selective chemistry. This release is
an important step in meeting quarantine requirements for our premium markets.”
The Mastrus female attacks the cocoons of codling moths, laying its eggs on the moth larvae. When the wasp larvae hatch,
they feed on, and eventually kill, the codling moth larva. They then emerge as adult wasps to disperse and seek new
codling moth larvae on which to lay their eggs.
“Biological control agents, such as parasitoid wasps, play an increasingly important role in controlling pests as
chemical interventions are reduced,” says scientist John Charles from Plant & Food Research. “This species, which originated in Kazakhstan, has been established in other countries, particularly in
the USA, for control of codling moth, and these initial releases in New Zealand will help us to determine how well they
survive in our environment and control the pest.”
The Mastrus wasp was approved for release by the Environmental Protection Agency in June, and thousands have since been
reared in captivity.
A video showing the female Mastrus wasp laying her eggs can be found at http://plantandfood.us5.list-manage.com/track/click?u=1b46d14e528ad30bae8b3663c=4098e51aff=5b367992d8.
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