Mouse plague crisis threatening WA grain crops and communities
Consensus Summary
Western Australia is facing a severe mouse plague threatening $1 billion in grain production, with infestations reaching plague proportions across cropping zones like the Mid-West, Wheatbelt, and Goldfields-Esperance. Scientists warn mouse numbers have surged to 2000â8000 per hectare, driven by rapid breedingâfemales produce litters every three weeksâand favorable conditions from recent cyclonic rains. Farmers report mice consuming freshly sown seeds, risking total crop failure, particularly in canola, while residents in towns like Morawa and Ravensthorpe describe unprecedented infestations in homes, including damage to food storage. Both sources agree on the urgency of baiting before sowing but highlight delays due to federal restrictions on high-strength bait (ZP-50). ABC adds visual evidence of mice damaging household items and cites a pest controller consuming 7.5 kg of bait in days, underscoring the scale, while NEWSCOMAU emphasizes compounding agricultural crises like fuel shortages and fertilizer scarcity. Despite consensus on the plagueâs severity, discrepancies exist in reported mouse densities and historical comparisons, with ABC framing it as unprecedented and NEWSCOMAU referencing past outbreaks for context.
â Verified by 2+ sources
Key details reported by multiple sources:
- CSIRO research officer Steve Henry reported mouse numbers exceeding 2000â8000 per hectare in WA cropping zones (Mid-West, Wheatbelt, Goldfields-Esperance) as of 2024, with 4000 burrows/hectare documented in some areas.
- Farmers in Western Australia are facing a plague-level mouse infestation impacting cereal crops (wheat, barley, canola) worth over $1 billion in production losses.
- Steve Henry (CSIRO) stated mice are breeding rapidlyâfemales produce 6â10 babies every 19â21 days, starting at six weeks old, leading to exponential population growth.
- Residents in regional WA communities (e.g., Morawa, Ravensthorpe) report unprecedented mouse infestations in homes, including damage to food containers and pantries.
- Farmers require federal approval to access high-strength mouse bait (ZP-50), which is currently restricted, delaying control efforts.
- Recent cyclonic rains in WA have worsened the plague by creating favorable breeding conditions and increasing food sources for mice.
Points of Difference
Details reported by only one source:
- WA Farmers chief executive Trevor Whittington called the outbreak one of the worst ever, emphasizing compounding issues like fuel crises, fertilizer shortages, and low grain prices.
- Farmer Belinda Eastough noted mice numbers in homes reached ~40 mice/day during past plagues, and current bait effectiveness is reduced due to abundant alternative food sources.
- Eastough stated property owners must manage mouse control via baiting, but current baits are less effective when mice have other food available (e.g., leftover grain).
- Whittington mentioned farmersâ first crop germination is imminent, and mice will deplete seeds without intervention, leading to total crop loss in canola fields.
- Pest controller Peter Cekanauskas reported consuming 7.5 kg of bait in <3 days on his property, estimating it could kill ~75 kg of mice, highlighting the scale of infestations.
- ABC included visual evidence (supplied photos/videos) of mice in homes (e.g., chewing through plastic oats containers and UHT milk cartons) and grain paddocks (e.g., Ravensthorpe seed cleaner).
- Steve Henry (ABC) compared current WA mouse numbers to the 2021 New South Wales plague, noting alarming growth from ~100 females/hectare to 600+ in three weeks.
- ABC cited a supplier remarking increased sales of mouse chemicals in affected regions, indicating heightened demand.
- ABC emphasized farmers must bait *before* sowing crops to prevent seed consumption, warning of significant yield losses if neglected.
Contradictions
Conflicting information between sources:
- NEWSCOMAU states farmers are seeing up to 8000 mice/hectare in some paddocks, while ABC only reports 'over 2000â3000 mice/hectare' as cause for concern (no mention of 8000).
- NEWSCOMAU implies current baits are less effective due to 'a lot of other food in the system,' but ABC does not explicitly quantify this alternative food source beyond general breeding conditions.
- ABC highlights visual evidence of mice damaging UHT milk cartons and plastic containers, while NEWSCOMAU does not mention this specific type of household damage.
- NEWSCOMAU quotes Belinda Eastough saying mice numbers in homes reached ~40/day during past plagues, but ABC does not provide a comparable historical benchmark for comparison.
- ABC frames the plague as 'spiralling out of control' with no prior precedent, whereas NEWSCOMAU describes it as 'one of the worst outbreaks' but references past plagues for context.
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