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Plague of mice threatens huge tracts of land in Australia

The New South Wales state government described the problem as ‘unprecedented’.

Mice discovered in a grain silo on a farm at Tottenham, Australia.
Mice discovered in a grain silo on a farm at Tottenham, Australia.
Image: Rick Rycroft

VAST TRACTS OF land in Australia’s New South Wales state are being threatened by a mouse plague which was described by the state government as “absolutely unprecedented”.

Just how many millions of rodents have infested the agricultural plains across the state is guesswork.

At night on many properties, the floors of sheds vanish beneath carpets of scampering mice, while ceilings come alive with the sounds of scratching.

One family blamed mice chewing electrical wires for their house burning down.

Agriculture minister Adam Marshall said this month: “We’re at a critical point now where if we don’t significantly reduce the number of mice that are in plague proportions by spring, we are facing an absolute economic and social crisis in rural and regional New South Wales.”

Farmer Bruce Barnes said he is taking a gamble by planting crops on his land near the central New South Wales town of Bogan Gate.

“We just sow and hope,” he said.

australia-mice-plague Source: Rick Rycroft

The risk is that the mice will maintain their numbers through the Southern Hemisphere winter and devour the wheat, barley and canola before it can be harvested.

NSW Farmers, the state’s top agricultural association, predicts the plague will wipe more than one billion Australian dollars (£547 million) from the value of the winter crop.

The state government has ordered 5,000 litres (1,320 gallons) of the banned poison Bromadiolone from India. The federal government regulator has yet to approve emergency applications to use the poison on the perimeters of crops.

Critics fear the poison will kill not only mice but also animals that feed on them, including wedge-tail eagles and family pets.

Mr Marshall said: “We’re having to go down this path because we need something that is super-strength, the equivalent of napalm to just blast these mice into oblivion.”

The plague is a cruel blow to farmers in Australia’s most populous state who have been battered by fires, floods and pandemic disruptions in recent years, only to face the new scourge of the introduced house mouse, or Mus musculus.

“They’re in the roof cavity of your house. If your house is not well sealed, they’re in bed with you. People are getting bitten in bed.

“It doesn’t relent, that’s for sure.”

Colin Tink estimated he drowned 7,500 mice in a single night last week in a trap he set with a cattle feeding bowl full of water at his farm outside Dubbo.

“I thought I might get a couple of hundred. I didn’t think I’d get 7,500,” Mr Tink said.

Mr Barnes said mouse carcasses and excrement in roofs were polluting farmers’ water tanks.

“People are getting sick from the water,” he said.

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The mice are already in Mr Barnes’ hay bales. He is battling them with zinc phosphide baits, the only legal chemical control for mice used in broad-scale agriculture in Australia. He is hoping that winter frosts will help contain the numbers.

Farmers like Mr Barnes endured four lean years of drought before 2020 brought a good season as well as the worst flooding that some parts of New South Wales have seen in at least 50 years.

But then, the pandemic brought a labour drought. Fruit was left to rot on trees because foreign backpackers who provide the seasonal workforce were absent.

Plagues seemingly appear from nowhere and often vanish just as fast.

Disease and a shortage of food are thought to trigger a dramatic population crash as mice feed on themselves, devouring the sick, weak and their own offspring.

Government researcher Steve Henry, whose agency is developing strategies to reduce the impact of mice on agriculture, said it is too early to predict what damage will occur by spring.

He travels across the state holding community meetings, sometimes twice a day, to discuss the mice problem.

“People are fatigued from dealing with the mice,” Mr Henry said.

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Press Association

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