Fast Facts

Horticulture welcomes major biocontrol milestone

The New Zealand horticulture industry has welcomed the Environmental Protection Authority’s (EPA) decision allowing the release of a tiny Samurai wasp into New Zealand, if ever there was an incursion of the brown marmorated stink bug (BMSB).

BMSB Council Chair Alan Pollard applauded the outcome as a major milestone against one of the greatest threats to New Zealand’s horticultural industry and urban communities.

“The industry greatly appreciates the positive decision and acknowledges the consideration given by the EPA to the significant number of submissions made on the application.

”We’ve achieved a significant step towards preparing for a major biosecurity risk, which is getting greater by the day, with increasing trade and tourism crossing our borders,” he said.

The Samurai wasp is the size of a poppy seed and completely harmless to humans and animals except stink bugs. It is a natural enemy of BMSB; the female wasp lays her eggs inside those of the stink bug, killing the nymph in the process. Studies overseas have shown that the wasp can destroy over 70 percent of the eggs in a stink bug egg mass.

“The stink bug could cause hundreds of millions of dollars of losses for our industry, as well as seriously damaging quality of life for all New Zealanders.

“With the heightened awareness of biosecurity risk across New Zealand, our industry is more aware than ever that we cannot afford to be, and never will be, complacent.

“Approving the release of Samurai as a biocontrol is an excellent step but there is more work to do before the wasp is ready to be used as a tool. It’s not the silver bullet and a stink bug incursion would require a multi-faceted approach.

“We’ve seen overseas growers rely on high levels of insecticide as the primary control for BMSB and, while this wasp provides the opportunity to reduce our dependence on chemicals, a full response will require every weapon in our armoury.”

Mr Pollard said the decision was made possible through the collaboration of horticultural industry groups and the Ministry for Primary Industries (MPI), working together under the Government Industry Agreement for readiness and response (GIA). He also acknowledged the science community for its impartial research that resulted in the Council using crucial information to support the application.

Permission to release the wasp will be subject to a number of strict controls that will dictate when, where, and by whom it can be released.

A NZIER report, commissioned by the Samurai Wasp Steering Group, has estimated that gross domestic product would fall by between $1.8 billion and $3.6b by 2038 if BMSB became established. It also estimated the horticulture export value could fall by between $2b and $4.2b.

Source: BMSB Council

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