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Action to stop stink bugs

Posted on 17 May, 2022
Action to stop stink bugs

Biosecurity NZ has launched its winter campaign to help raise awareness of a particularly unwanted pest – the brown marmorated stink bug (BMSB).

Dr Cath Duthie, manager of readiness, says: “The BMSB poses a major threat to New Zealand’s horticulture industry with the potential to cost the country nearly $4 billion if it establishes here. 

“There is always the chance the pest could arrive in parcels and with other imported items. We very much want the public to help us with surveillance efforts.”

The campaign focuses on how to correctly identify BMSBs and report them. They look like some other bug species but have identifiable elements, such as white stripes or banding on its antennae and abdomen. They are about the same size as a 10-cent coin.

The winter campaign follows the spring-summer campaign of 2021/22, which saw adverts placed on Kiwis’ phone and computer screens. It had a “great result” by appearing on computer screens more than 13.5 million times.

Biosecurity NZ asks anyone who thinks they’ve found a BMSB to catch it, snap it and report it online via or by calling 0800-809-966. The bugs can be caught under a glass or in a container.

Duthie says: “Winter is the time when the BMSB is most likely to be found in enclosed spaces and indoors. This can cause problems for homeowners. As summer comes, any BMSB is more likely to be found outdoors.

The 2021/22 high-risk season finished on April 30 with no evidence of any established stink-bug population in New Zealand.

There were 61 live bugs intercepted in New Zealand during the 2021/22 season, mostly associated with imported cargo, and the number of live interceptions has dropped considerably over the past three years.

“This is largely due to the introduction of import rules that make it harder for BMSBs to enter New Zealand on risky cargo such as vehicles, machinery and parts from countries with established stink bug populations,” says Duthie. “Such cargo must be treated before arriving in New Zealand during the BMSB season.

“Biosecurity NZ further tightened its border controls during the just-completed season. This included introducing targeted alerts on additional goods associated with BMSB detections.

Consignments covered by the alerts underwent full inspection to rule out the presence of live bugs.

“The fact we have no established BMSB populations suggests the current biosecurity approach is working well. However, the risk of an incursion is never zero.”