State Agriculture and Food Minister Kim Chance says the number of quarantine inspectors at the airport would increase from four to six people and the number of detector dogs would double from three to six.

"Quarantine WA is now more easily recognised at all checkpoints, with a new distinctly branded uniform in blue and gold, and our detector dogs will wear the same colours," Mr Chance said.

"Clearly recognisable quarantine inspection stations are also being installed in the airport terminals."

Mr Chance said the new measures had become necessary due to an increase in domestic passengers arriving in Perth, plus increased interstate road and rail trade and travel.

"Last year, more than 1.7 million air passengers arriving in WA from interstate were checked," he said.

"Quarantine staff confiscated 2486 kilos of fruit and vegetables. A further 13,111 kilos of quarantine risk material were placed in the amnesty bins in WA."

Mr Chance said the detection of quarantine risk material in interstate mail had been made easier as well, with the installation of a new state-of-the-art RapiScan x-ray machine at the Australia Post Parcels Centre.

"There are also plans to introduce a new active detector dog to the postal centre in July to further boost detection capabilities," he said.

"Quarantine inspections at the road checkpoints on the border continue to be maintained on a 24-hour, seven days a week basis, and will continue to inspect all vehicles entering the State."

Mr Chance said WA enjoyed a reputation for high standards of product integrity and safety, which provided access to lucrative overseas markets.

"This reputation depends on our ability to remain free of many exotic pests, diseases and weeds that are present elsewhere," he said.

"Of our agricultural produce, 80pc is exported globally, earning WA $5.5billion annually.