Australian fruit producers are facing increased costs following a back-yard outbreak of Queensland fruit fly in the Victoria area.

Growers in the Goulburn Valley, could be facing costly treatment processes if a fruit fly declaration is made by the Victorian government.

Action is now being taken, with a letter drop being conducted to seek the co-operation of householders with back-yard fruit trees in the affected area of Shepparton, to identify and eradicate the pest.

Although outbreaks have occurred regularly in areas closer to the Murray River, this is the first time in more than a decade the pests have got a foothold in Shepparton, so close to the heart of the fruit industry.

A declaration signed by Victorian Agriculture Minister Bob Cameron is expected to be made soon.

If that happens, growers will have to take a number of alternative steps before sending the fruit to fresh fruit markets.

Declarations normally involve a 15 km suspension zone, which would include the most intensive fruit growing areas of the Goulburn Valley.

Measures required could include spraying the fruit on trees, treating the fruit on packing lines or using extended cold storage.

Fruit Growers Victoria deputy chairman Ian Bolitho said the outbreak would not stop fresh fruit sales, but would impose extra work and costs on growers.

"We have to stay positive. This has happened. Let's get onto it, solve the problem and clean it up," he said.