You go to sleep at night, and the mice are running across your bed.
Across the grain fields of Western Australia and South Australia, a mouse plague of historic scale has turned the fruits of a record harvest into the seeds of catastrophe. Populations reaching 10,000 rodents per hectare — more than twelve times the threshold that defines a plague — are consuming freshly planted crops, invading homes, and erasing the boundary between livelihood and refuge. The crisis arrives at the worst possible moment, layered atop fuel and fertilizer costs doubled by geopolitical upheaval, and it asks of farmers not only economic endurance but a psychological resilience that has no clear off switch. As winter approaches and stronger baits become available, the land may yet recover — but the human cost of living inside an infestation has already left its mark.
- Mouse populations have exploded to 3,000–10,000 per hectare across key grain regions, consuming seeds overnight and rendering the most critical planting season of the year a race against an enemy that reproduces faster than it can be killed.
- A paradox of abundance triggered the crisis — a record harvest left grain scattered across paddocks, and summer rains grew fresh shoots, creating conditions one agronomist describes as 'mouse heaven,' with females cycling through pregnancy every two to three days.
- The psychological toll is unlike any other agricultural disaster: farmers cannot close a door and find relief, because the mice are in the cupboards, the ceiling, the bed — the infestation follows them into every corner of their lives.
- Diesel and fertilizer costs have doubled since a February conflict in Iran began, meaning the plague compounds an already strained year rather than arriving in isolation, pushing some farmers toward the edge of what they can absorb.
- A stronger poison bait, long requested and recently approved by national regulators, is now in farmers' hands, and approaching winter temperatures are expected to slow breeding — but the damage to crops, finances, and sleep has already accumulated.
In the grain-growing regions of Western Australia and South Australia, farmers are confronting a mouse plague of proportions most have never witnessed. Populations estimated between 3,000 and 10,000 rodents per hectare — far beyond the 800-per-hectare threshold that defines a plague — are devouring freshly planted seeds, raiding stored grain, and moving through homes with a persistence that offers no respite. Farmers are spending hundreds of thousands of dollars on poison bait and replanting, fighting a battle that restarts each morning.
Geoff Cosgrove, who manages a 14,000-hectare farm in Mingenew and has farmed for 25 years, has never baited this relentlessly. The mice run through ceilings and air conditioning units at night. "They do play with your mind," he says. Belinda Eastough, a 59-year-old agronomist and farmer near Geraldton with nearly four decades of experience, estimates 8,000 to 10,000 mice per hectare on her property. "I'm living the nightmare," she says plainly.
The conditions that enabled the plague were, cruelly, born of success. Last year's record harvest left grain scattered across paddocks, and summer rains then produced fresh green growth — a combination that sent mouse populations into explosive reproduction. Mice reach sexual maturity at six weeks and can produce six to ten litters every three weeks, with females falling pregnant again within days of giving birth. CSIRO researcher Steve Henry counted 30 to 40 active burrows in a single 100-meter stretch during a recent visit — translating to thousands of burrows per hectare across affected land.
The crisis lands on top of an already difficult year. Fuel and fertilizer costs have doubled since a conflict involving Iran began in February, and the plague is, as one farmer puts it, another headache piled onto existing strain. Retired farmer Damian Ryan, in 50 years of farming, has never seen anything like the 150 mice he catches in his shed each day. CSIRO's Henry notes that unlike drought, which allows farmers to close a door and find some relief, a mouse infestation follows people inside — into cupboards, across beds, through every room.
Some relief is now within reach. A stronger bait, requested for months, has recently received regulatory approval. Cooler, wetter weather is forecast — conditions that slow mouse survival and breeding. Cosgrove holds onto that: "Eventually they do stop 'cause it gets too cold and wet." But the damage to crops, finances, and the quiet of a night's sleep has already been done, and hope, for now, must carry more weight than certainty.
Across the grain-growing regions of Western Australia and South Australia, farmers are waking to a crisis that follows them indoors. Thousands of mice per hectare—some estimates reaching 10,000—are devouring freshly planted seeds, ravaging stored grain, and invading homes with a persistence that defies the usual rhythms of farm life. This is not a minor seasonal nuisance. It is a plague of proportions that has forced farmers to spend hundreds of thousands of dollars on poison bait, replanting, and the grinding work of trying to reclaim their land from rodents.
Geoff Cosgrove, 43, manages a 14,000-hectare farm in Mingenew, Western Australia, growing wheat, canola, lupin, and barley. In his 25 years of farming, he has had to bait for mice exactly twice. This year, he is doing it constantly. "They do play with your mind," he says. "Running around at night, in the ceiling, the air conditioning units. You can hear them and you can smell them—it's like a decaying body." The psychological weight of the infestation is as real as the economic one. When you close your door at night, the mice are still there. When you open your cupboard, they scatter. There is no refuge.
The conditions that created this catastrophe were, paradoxically, signs of success. Last year brought a record-breaking harvest, leaving grain scattered across paddocks—an all-you-can-eat buffet for rodents. Then summer rains arrived, spurring the growth of fresh green shoots. As Belinda Eastough, a 59-year-old agronomist and farmer near Geraldton, puts it: "Instead of just steak, they got steak and salad. Basically, the mice were in absolute mouse heaven." On her 5,500-hectare property, she estimates 8,000 to 10,000 mice per hectare. She has been farming for nearly 40 years and says plainly: "I'm living the nightmare."
The timing could not be worse. Autumn is when grain growers plant their crops—the most critical months of the year. Farmers who finish seeding at 8 p.m. wake to find entire rows of newly planted seed consumed overnight. The mice breed with terrifying speed: they reach sexual maturity at six weeks old and can produce six to ten litters every 19 to 21 days. Within two or three days of giving birth, a female is pregnant again. Steve Henry, a research officer at Australia's CSIRO who specializes in rodent control, visited Western Australia recently and counted 30 to 40 active burrows in a 100-meter stretch of a one-meter-wide strip. Multiplied across a hectare, that translates to 3,000 to 4,000 burrows per hectare—far beyond the 800-per-hectare threshold that defines a plague. "That's a monumental problem," Henry says, "as this is a really important time for farmers."
The economic pressure compounds an already difficult year. Diesel and fertilizer costs have doubled since the Iran war began in February. Farmers are paying twice what they paid three months ago for fuel. The mouse plague is, as one farmer describes it, "another headache" piled on top of existing strain. Damian Ryan, a retired farmer in Morawa, 370 kilometers north of Perth, has been catching 20 to 30 mice in his house and about 150 in his shed each day. In 50 years of farming, he has never seen anything like it. "These things were like plague proportions," he says. "You drive around at night and you just see mice running everywhere."
Henry points out something often overlooked in discussions of agricultural disaster: the psychological toll is distinct from other crises. "If you're dealing with a drought, you can go inside and close the door and turn on the air conditioner and get some level of respite," he explains. "But if you're dealing with mice, you go inside, close the door, go to your cupboard, and the mice are in the cupboard. You go to sleep at night, and the mice are running across your bed." There is no escape, no boundary between work and home, no moment when the problem stops being your problem.
Relief may be coming, though it arrives late. Farmers have been requesting access to a stronger poison bait for months, waiting for approval from the national regulator. That permission was granted recently, and the higher-strength bait is now available. Cooler temperatures are forecast, and rain is expected—conditions that slow mouse breeding and survival. Cosgrove is hopeful. "Eventually they do stop 'cause it gets too cold and wet," he says. But hope is not the same as certainty, and the damage—to crops, to finances, to sleep—has already been done.
Citações Notáveis
They do play with your mind—running around at night, in the ceiling, the air conditioning units. You can hear them and you can smell them—it's like a decaying body.— Geoff Cosgrove, 43-year-old farmer in Mingenew, Western Australia
I'm living the nightmare.— Belinda Eastough, agronomist and farmer near Geraldton
A Conversa do Hearth Outra perspectiva sobre a história
What made this year so different from the 2021 plague that hit the same region?
The harvest was record-breaking. That left grain scattered everywhere in the paddocks. Then summer rain came and the green shoots grew. The mice had both abundance and variety. It was perfect conditions.
So the farmers' success last year created the conditions for this disaster?
Exactly. A good year feeds the mice population exponentially. And once they start breeding—six to ten litters every three weeks—the numbers spiral beyond what anyone can control with conventional methods.
Why is the psychological impact so severe compared to other farm crises?
Because you can't close the door on it. With drought, you go inside and you have respite. With mice, they're in your cupboard, in your ceiling, running across your bed at night. The problem follows you everywhere.
The farmers are already dealing with doubled fuel costs. How much worse does this make things?
It's layered crisis. They're already stretched thin financially. Now they're spending hundreds of thousands on bait and replanting. And they're losing sleep. The exhaustion is real.
Is the stronger bait that just got approved going to solve this?
It will help, especially with winter coming. But the damage is done. The mice have already consumed seed, destroyed crops, and worn farmers down. The bait is relief, not recovery.