The claimant's allege the government was negligent when it let a specific shipment of anthers - part of the plant's stamen that contains pollen - from a Psa-ravaged part of China into New Zealand, and that this negligence is what caused the losses to kiwifruit growers during the subsequent Psa outbreak across the country.
"The government denies that direct connection. It also denies that its decision to let in the anthers from an infected part of China was negligent and even denies it owes a duty of care to growers in protecting our country from pests and diseases anyway," he said.
"We think the government does have a legal duty of care to growers, as well as its obvious moral and political duty to all New Zealanders to take the utmost care when protecting our country's agriculture and unique native flora and fauna from foreign pests, and it should be accountable through the courts when it carries out its critical biosecurity role."
Psa was first detected in New Zealand in the Bay of Plenty (Te Puke) in November 2010.
Since then the disease has spread widely throughout the Bay of Plenty and is now also present and is present in other parts of the North Island as well.
The gold variety - Hort16A - was particularly susceptible but the new variety, Gold3, has proven to be more resistant to the disease.