A destructive potato virus recently detected for the first time in Australia has now been found at two sites in Tasmania.
Potato mop-top virus was confirmed at a research plot in southern Tasmania on August 20, just three weeks after it was first discovered on a commercial farm in the state’s north-west.
Biosecurity Tasmania said the latest case was identified last week at an “additional site” in the south.
“Biosecurity Tasmania is working to put movement controls in place at the second detection site to manage the movement of potato material, machinery and equipment,” the Department of Natural Resources and Environment said.
The virus was found in ‘volunteer’ potatoes – plants that sprout from tubers left behind after harvest.
“The tubers can survive in the soil and then sprout in future seasons,” the department said.
The disease causes deep cracking and rust-coloured streaks in potato flesh, badly affecting both quality and yield in what is one of Tasmania’s key agricultural industries.
Movement of potato stock, machinery and equipment is now restricted at both affected properties.
While the virus does not pose any risk to human health and infected potatoes are safe to eat, the economic fallout could be severe if the pathogen spreads further.
Response teams are carrying out surveillance and sampling to determine how far the virus has spread.
“Next steps, including an assessment of the feasibility of eradication, will depend on this further information being gathered,” the department said.
“All potato growers need to remain vigilant for any signs of disease in potato plants and potato stock.”
Potato growers have been urged to stay alert for signs of disease and report any unusual symptoms to the Exotic Plant Pest Hotline on 1800 084 881.
They are also being reminded to stick to good biosecurity practices, such as using a dedicated high-pressure wash station for gear, clothing, machinery and equipment.
