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Kiwifruit's most unwanted

Kiwifruit's most unwanted

There are eight organisms identified as the biggest biosecurity threat to New Zealand's kiwifruit industry.

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 Kiwifruit's most unwanted

Kiwifruit's most unwanted

Fruit flies

Fruit flies are the kiwifruit industry's most unwanted biosecurity threat. Any incursion can severely impact where we sell our fruit. The high risk period for fruit flies is September to June.

The Queensland Fruit Fly (QFF), native to Australia (our closest neighbour), is considered to be the greatest threat and has the most market impacts.

The financial impact of a fruit fly incursion to New Zealand’s kiwifruit industry is estimated to be between $2 million and $430 million. KVH has produced a short report summarising the financial impacts of different incursion scenarios based on previous fruit fly incursions in New Zealand and overseas and economic modelling by Underwood (2007).

Threat Levels
Likelihood of entry
Medium
Likelihood of establishment
Medium
Production impacts
High
Market access impacts
Very Low

Pest ranking based on the KVH risk matrix

View risk matrix

KVH has developed a guide for growers that details the likely sequence of events if a fruit fly response was to occur in a kiwifruit growing region.

Plant & Food Research have been granted permission to import sterile QFF into a New Zealand containment facility to develop new attractants for female and male flies.

This long-term project will determine what the flies can smell and whether the odours can be used to improve the sensitivity of traps or increase the numbers of flies lured in. Three approaches are being used; odours based on host fruit, sex pheromones and bacteria.

This research is part of a larger collaborative approach with Australian organisations to manage and eradicate QFF populations. 

Supporting this is a Sterile Insect Technique (SIT) facility that can produce 50 million sterile QFF per week as an eradication tool for release in Australia or New Zealand should an established population ever become large enough for this to be required. Read more about the project here.

KVH supports these research activities as an integral component of our readiness activities for the industry’s most unwanted biosecurity threat.


Further fruit fly resources

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LATEST NEWS

21 Feb 2025

Auckland fruit fly – controls on produce movements now in place

Legal controls on the movement of fruit and vegetables are now in place in the Auckland suburb of Birkdale and nearby areas on the North Shore following the detection of a single male Oriental fruit fly. The horticulture pest was found in one of Biosecurity New Zealand’s national surveillance traps which are placed in fruit trees in residential back yards. Other traps in the area checked in recent days have showed no signs of other flies and initial investigations have found no other signs to date. Biosecurity New Zealand staff have been busy in the area today laying more traps and giving out information to households. Around 100 additional traps which specifically target oriental fruit fly are being placed within a 1500m area of the original find. You can find a detailed map of the controlled area and a full description of the boundaries and rules in place here. The controlled area has two zones – A and B. Zone A is a 200m zone. Zone B covers a 1500m area. No whole fresh fruit and vegetables, except for leafy vegetables and soil free root vegetables, can be moved outside Zone A. This applies to all produce, regardless of whether it was bought or grown. All fruit and vegetables grown within Zone B cannot be moved out of the controlled area. These legal controls are an important precaution. Should there be any more flies out there, this will help prevent their spread out of the area. It is likely the restrictions will be in place for at least two weeks. KVH is working closely with Biosecurity New Zealand and other horticultural Government Industry Agreement (GIA) partners on these actions to minimise the risk to kiwifruit growers. While it's disappointing to detect another Oriental fruit fly so soon after closing the previous response in Papatoetoe, the latest find highlights the value of trapping and surveillance efforts, which members of the kiwifruit growing community fully support. Biosecurity New Zealand website for detailed movement restriction information and fact sheets. KVH Oriental fruit fly fact sheet. KVH Oriental fruit fly identification guide.

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20 Feb 2025

Biosecurity New Zealand investigating and boosting trapping after new Auckland fruit fly find

A biosecurity operation is under way and extra field teams are today in the suburb of Birkdale, on Auckland’s North Shore, after the find of a single male Oriental fruit fly in a surveillance trap in a suburban backyard. This is the same species of fruit fly that we responded to in Papatoetoe recently, but it is too early to say whether the two finds are linked. Further DNA analysis of the fly will take place over the coming days. With this latest detection, activities are moving quickly to look for any other flies and eradicate them. Biosecurity New Zealand are ramping up trapping and inspection, with daily checks in a 200-metre zone from the original find and checks every three days in a second zone out to 1500m. The capture of a single male does not mean we have a breeding population. However, while checks are underway for other fruit flies, the community is being asked to help prevent any possible spread. As a precautionary measure, legal restrictions will be put in place on the movement of fruit and vegetables out of the area where the fruit fly was found. Instructions about these controls and the exact area affected will be issued tomorrow (Friday). Response staff will be out tomorrow providing people with information. KVH is working closely with Biosecurity New Zealand and other horticultural Government Industry Agreement (GIA) partners on these actions to minimise the risk to kiwifruit growers. There have been 13 incursions of different fruit fly in Auckland and Northland since 1996 and all have been successfully eradicated. Read more about Oriental fruit flies here – including images. We will provide further updates and information as our response actions continue.

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13 Feb 2025

Auckland fruit fly controls lifted

Controls on the movement of fruit and vegetables in the Auckland suburb of Papatoetoe have been lifted after no further evidence of the Oriental fruit fly was found in the area. The decision to end the operation follows more than a month of intensive fruit fly trapping and inspections of hundreds of kilograms of fruit. Residents and businesses in the affected area have supported the movement controls, keeping an eye out for fruit flies and safely disposing of fruit in provided bins – vital to helping protect the kiwifruit industry and wider horticultural sector. Biosecurity New Zealand quickly placed legal controls on the movement of fruit and vegetables in an area of Papatoetoe on 4 January after a single male Oriental fruit fly was identified from a national surveillance trap. No further adult fruit flies, eggs, larvae, or pupae have been found. With no further detections over six weeks, the response governance group (including Biosecurity New Zealand and KVH, alongside other horticulture industry groups) is confident the Controlled Area Notice restrictions can be lifted and response operations closed. The checking of 7800 fruit fly traps around the country, including some 200 traps in the Papatoetoe/Māngere area, will continue as normal. KVH thanks the great work of our industry partners APAC and Punchbowl for their assistance in response activities - by working together, and responding quickly, we have managed this situation well and limited impacts to our industry and growers. Key figures: More than 1500 visits made to check the 109 fruit fly response traps in Papatoetoe/Māngere. Over 600 biosecurity bins distributed within the community to collect produce waste for safe disposal. More than 470 kilos of fruit cut up and examined for any signs of fruit fly eggs or larvae. More than 150 staff involved throughout the response, and kiwifruit industry personnel from KVH, APAC and Punchbowl. Read more about the detection and activities that lead to this successful outcome on our website here.

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