Western Australia faces severe mouse plague threatening agriculture and communities
Consensus Summary
Western Australia is experiencing a severe mouse plague that scientists warn could devastate $1 billion worth of grain crops across regions like the Mid-West, Wheatbelt, and Goldfields-Esperance. Mouse numbers have surged to unprecedented levels, with some paddocks reporting up to 8000 mice per hectare, far exceeding previous outbreaks. Farmers are scrambling to bait their fields before sowing crops, as mice are already damaging seeds and threatening yields, particularly in canola. CSIRO researcher Steve Henry emphasizes the rapid breeding rate of mice, with females producing multiple litters every few weeks, accelerating the crisis. Residents in regional communities report mice invading homes in numbers not seen before, chewing through food containers and creating sanitation issues. While both sources agree on the severity and urgency of the problem, they differ on specific metrics like burrow counts and regulatory hurdles for high-strength baits. The plague compounds existing agricultural challenges, including fuel shortages and fertiliser scarcity, leaving farmers overwhelmed and seeking federal intervention.
✓ Verified by 2+ sources
Key details reported by multiple sources:
- CSIRO research officer Steve Henry is warning about unprecedented mouse plague levels in Western Australia's grain paddocks (ABC, NEWSCOMAU).
- Mouse numbers in Western Australian paddocks exceed 200–300 per hectare, with some areas reporting up to 8000 per hectare (ABC: 200–300; NEWSCOMAU: 8000).
- Farmers in WA’s Mid-West, Wheatbelt, and Goldfields-Esperance regions are reporting mouse infestations (NEWSCOMAU), with some areas like Ravensthorpe seeing mice running in large numbers (ABC).
- Mice are damaging freshly sown seeds, particularly in canola crops, causing significant yield losses (NEWSCOMAU).
- Steve Henry visited WA in 2022 when mouse numbers were high, but this year’s outbreak is worse (ABC).
- $1 billion worth of grain crops in WA is at risk from the mouse plague (NEWSCOMAU).
- Farmers are encouraged to bait before sowing crops to prevent losses (ABC, NEWSCOMAU).
- Mice breed prolifically, with females producing 6–10 babies every 19–21 days and becoming pregnant again within days (ABC).
- Residents in regional WA communities report unprecedented mouse sightings in homes, including chewing through plastic containers and milk cartons (ABC).
- Peter Cekanauskas, a pest controller, consumed 7.5 kg of bait in under three days, estimating it could kill ~75 kg of mice (ABC).
- Farmers are facing supply shortages for high-strength mouse bait like ZP-50, requiring federal approval (NEWSCOMAU)
Points of Difference
Details reported by only one source:
- CSIRO’s Steve Henry reports over 2–300 mice per hectare as a ‘cause for concern’ (ABC).
- A resident reported mice eating through a plastic container of rolled oats and nibbling UHT milk cartons, causing spills (ABC).
- Steve Henry cited a supplier remarking increased sales of chemicals in the affected area (ABC).
- Mention of a 2021 mouse plague in New South Wales as a historical comparison (ABC).
- Peter Cekanauskas’s personal experience with 12 mice in his pantry and torn bags of flour/sugar (ABC).
- Reference to farmers reducing paddock movements due to fuel shortages, complicating bait distribution (ABC).
- CSIRO’s Steve Henry visited WA in 2022 when numbers were high, but this year’s outbreak is worse (ABC).
- Farmers report more infestations than ever before, with pest controllers overwhelmed (ABC)
- Farmers found about 4000 burrows per hectare in crops (NEWSCOMAU).
- WA Farmers chief executive Trevor Whittington states the plague is one of the worst outbreaks threatening $1bn in grain production (NEWSCOMAU).
- Cyclonic rains have worsened conditions, with mice numbers set to explode further (NEWSCOMAU).
- Farmers are unable to access high-strength bait ZP-50 without federal approval, adding to existing fuel and fertiliser shortages (NEWSCOMAU).
- Belinda Eastough notes that leftover grain from good harvests created more shelter and food for mice (NEWSCOMAU).
- Current bait is less effective if mice have access to other food, requiring them to find multiple toxin grains for a lethal dose (NEWSCOMAU).
- Farmers previously caught ~40 mice per day inside homes during the last plague (NEWSCOMAU).
- Mention of farmers needing emergency payments to cope with the crisis (NEWSCOMAU)
Contradictions
Conflicting information between sources:
- ABC reports mice numbers exceeding 200–300 per hectare as concerning, while NEWSCOMAU states some paddocks have up to 8000 mice per hectare without specifying if this is a maximum or average.
- ABC does not mention burrows per hectare as a metric, whereas NEWSCOMAU reports farmers found about 4000 burrows per hectare.
- NEWSCOMAU states farmers are unable to access ZP-50 bait without federal approval, but ABC does not mention this specific bait or regulatory hurdle.
- ABC highlights fuel shortages complicating bait distribution, while NEWSCOMAU focuses on bait effectiveness due to competing food sources rather than logistical barriers.
- NEWSCOMAU mentions farmers previously catching ~40 mice per day inside homes during the last plague, but ABC does not provide a comparable historical figure for home infestations.
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