A product called actiguard was registered last week for use against the PSA kiwifruit vine disease.
Country Life reports it triggers a biochemical pathway in the kiwifruit plant that protects it against PSA.
It is sprayed onto vines prior to flowering and has to be used in conjunction with other control methods. The spray costs $170 per hectare.
As of this week 791 kiwifruit orchards have been confirmed with PSA - that's 24% of all orchards in New Zealand.
Gold vines have been the most badly affected by PSA. Country Life reports that growers who have fruit and can continue growing it through to the harvest expect it to be worth gold - as it will be in such short supply.