A whistleblower claims Tasmania's airports do not have enough biosecurity staff to avoid the risk of an incursion.

The Community and Public Sector Union (CPSU) has backed the allegations of an anonymous staffer who says the lack of quarantine officers and detector dog handlers increases the chance that new risks will enter the state.

“Boxing Day there was a single, untrained administrative staff member at Launceston Airport,” the worker wrote in an anonymous email.

CPSU assistant secretary Thirza White says there is a high level of under-resourcing putting Tasmania's pest-free status and multi-million-dollar fruit industry in danger.

The Tasmanian Government had pledged to put on nine full detector dog teams for the summer period, but the whistleblower says airport “don't even have the six handlers we are supposed to”.

“One of these positions has been vacant for over two years,” the worker said.

Primary Industries Minister Jeremy Rockliff dismissed the claims.

“With regards to detector dogs, the various claims made by the union are wrong,” he told the ABC

“The recruitment of the new additional detector dog teams is on track - already a senior dog handler is on the frontline working and eight dogs have graduated and are also on the beat.

“This brings the total number of detector dogs to 12.

“We're increasing the detector dog teams by 50 per cent to nine teams, levels never before seen in Tasmania.

“As we've always said, this will give us the capacity to target 100 per cent of flights at major airports with detector dog teams, and increase our presence at regional airports and mail distribution centres.”