Mouse plague crisis threatening WA grain crops and homes
Consensus Summary
Western Australia is facing a severe mouse plague threatening $1 billion in grain crops across regions like the Mid-West, Wheatbelt, and Goldfields-Esperance, with densities reaching up to 8000 mice per hectare in some areas. Scientists warn the population could explode further due to recent cyclonic rains and warm conditions, forcing farmers to bait fields before sowing to prevent seed loss. Beyond agriculture, residents report unprecedented infestations in homes, with mice damaging food storage and multiplying rapidly—some females producing 6–10 offspring every three weeks. While both sources agree on the scale and urgency, ABC emphasizes domestic invasions and bait consumption rates, whereas NEWSCOMAU highlights federal regulatory hurdles and long-term agricultural impacts. Farmers face additional pressures from fuel shortages and low grain prices, compounding the crisis.
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Key details reported by multiple sources:
- CSIRO research officer Steve Henry reported mouse numbers exceeding 2000–8000 per hectare in WA cropping zones (Mid-West, Wheatbelt, Goldfields-Esperance) as of 2024, with 4000 burrows per hectare documented in some areas.
- Farmers in Western Australia are facing a mouse plague impacting cereal crops (wheat, barley, canola) worth over $1 billion, with urgent baiting required before sowing to prevent seed consumption.
- Steve Henry (CSIRO) stated mice start breeding at six weeks old, producing 6–10 offspring every 19–21 days, leading to exponential population growth (e.g., 100 females/hectare could become 600 in three weeks).
- Residents in regional WA communities (e.g., Morawa, Ravensthorpe) reported 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 unavailable without regulatory exemption.
Points of Difference
Details reported by only one source:
- WA Farmers chief executive Trevor Whittington warned cyclonic rains would worsen the plague, stating 'numbers are already incredibly high and they’re going to explode again.'
- Belinda Eastough noted mice numbers in homes reached about 40 per day during past plagues, and farmers left excess grain in fields created shelter/food for current infestations.
- Farmers cited compounding issues (fuel crisis, fertiliser shortages, low grain prices) alongside the mouse plague as major stressors.
- Pest controller Peter Cekanauskas consumed 7.5 kg of bait in three days at his Morawa property, estimating it killed ~75 kg of mice, and reported mice chewing through plastic containers and UHT milk cartons.
- Steve Henry mentioned a resident’s video showing 'hundreds of mice running around' at Ravensthorpe’s seed cleaner facility.
- ABC highlighted farmers reducing paddock movements to conserve fuel, making bait distribution logistically challenging.
Contradictions
Conflicting information between sources:
- NEWSCOMAU states farmers are seeing up to 8000 mice per hectare in some paddocks, while ABC only reports 'over 2000–3000' as cause for concern without citing 8000.
- NEWSCOMAU implies current bait (e.g., ZP-50) is unavailable without federal approval, but ABC does not mention ZP-50 specifically, only 'high strength bait' in general.
- ABC describes mice consuming 7.5 kg of bait in three days (killing ~75 kg of mice), while NEWSCOMAU does not provide bait consumption data or lethal dose specifics.
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