Grain farmers in Western Australia are battling a rapidly escalating mouse plague, with infestations reaching alarming levels and triggering fears of widespread crop damage and economic losses. Reports from key agricultural regions suggest the situation has already crossed the threshold of a full-blown plague, with scientists warning that the crisis could intensify in the coming weeks.
According to researchers, plague conditions are typically declared when mouse populations exceed 800 per hectare. However, in parts of Western Australia, especially around Geraldton and the southern wheatbelt, densities have surged far beyond that benchmark. Field reports indicate as many as 3,000 to 4,000 burrows per hectare, signalling an unprecedented infestation that has left farmers struggling to cope.
The situation is equally concerning in South Australia, where mouse numbers across the Adelaide plains are described as “extremely high”. Experts say the rapid rise across multiple regions suggests a broader pattern that could mirror previous outbreaks.
Scientists attribute the surge largely to favourable breeding conditions and abundant food supply. Mice reproduce at a rapid rate, with females capable of producing multiple litters in quick succession, allowing populations to explode within weeks. Combined with leftover grain from previous harvests and suitable weather conditions, this has created an ideal environment for the rodents to thrive.
Farmers are now on high alert as the outbreak coincides with the crucial sowing season. Mice are known to consume freshly planted seeds, often wiping out entire rows of crops before they can germinate. This not only threatens immediate yields but could also have a cascading impact on production cycles and farm incomes.
Authorities and agricultural experts have urged farmers to take preventive measures, including close monitoring of paddocks and timely baiting to control populations. However, there are growing concerns about the availability and effectiveness of rodent control methods, with some farmers calling for access to stronger chemical baits to contain the outbreak.
The current crisis has also revived memories of the devastating 2020–21 mouse plague in eastern Australia, which caused an estimated $1 billion in damage. That outbreak not only destroyed crops but also led to contamination of food supplies, health risks for humans and livestock, and significant psychological stress in rural communities.
While conditions in other states such as New South Wales, Victoria and Queensland remain relatively stable for now, experts warn that mouse plagues tend to occur cyclically every few years. The present surge, therefore, could be an early indicator of a wider national problem if not contained promptly.
With farmers already grappling with rising input costs and global economic pressures, the mouse plague has added another layer of uncertainty. Unless swift and effective control measures are implemented, the outbreak risks spiralling into a major agricultural crisis, threatening both livelihoods and food production.
