UPDATED 5.03PM: A Controlled Area has put in place after a male fruit fly was found in Auckland. 

The Ministry for Primary Industries says a single male Queensland fruit fly was found in surveillance trap in Grey Lynn. 

Signs are being put up asking people not to move any fresh fruit or vegetables beyond the area, which includes parts of Grey Lynn, Western Springs, Mt Albert, Ponsonby and Kingsland.

MPI Chief Operations Officer Andrew Coleman says this is not an "outbreak", as only one insect was trapped.  

Ministry for Primary Industry field teams are setting up additional traps today to determine if other flies are present in the area. 

Minister for Primary Industries Nathan Guy says the Government is treating the discovery seriously.

"A team of 60 plus are already on the ground here," he said.

"Those numbers will increase to over one hundred, possibly to one hundred and twenty."

"We know it could have detrimental impacts on the horticulture sector in New Zealand."

Fruit flies are considered to be a pest and dangerous to fruit and vegetable crops in New Zealand. According to BioSecurity NZ, establishment of the pest "would have serious consequences for New Zealand’s horticultural industry".

Horticulture New Zealand's chief executive Peter Silcock is alarmed at the latest discovery.

"We received the news with a huge amount of concern for the industry and the growers that we represent," he said.

"We know that they're going to be very worried about this and the risk that we're facing."

In January and April 2014, Queensland fruit flies were found around Whangerei, resulting in a controlled area.  

MPI guidelines

"All whole fresh fruit and vegetables (except for leafy vegetables and root vegetables) cannot be moved outside of the Controlled Area.

"Within the wider Controlled Area there is a smaller central Zone A (which takes in a circle 200 metres out from the initial find), and whole fruit and vegetables cannot be moved outside of this Zone at all.

"Fruit and vegetables can continue to be transported from outside the Controlled Area into the Controlled Area.

"Residents are asked to avoid composting any of these risk fruits and vegetables. For disposing of fruit and vegetable waste, they are encouraged to use a sink waste disposal unit if possible.

"MPI will be providing special bins in the Controlled Area for the disposal of fruit and vegetable waste. The locations of these bins will be advised shortly."