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 scientists and farmers warning of unprecedented infestation levels. CSIRO research shows mice populations have exploded to 2,000–8,000 per hectare in key cropping regions like the Mid-West and Wheatbelt, consuming freshly sown seeds and devastating crops such as canola, wheat, and barley. Cyclonic rains and warm temperatures are accelerating breeding, with mice reproducing rapidly—females giving birth every three weeks. The crisis is compounded by regulatory hurdles, as farmers struggle to access high-strength bait ZP-50 without federal approval, while supply shortages and fuel crises add to their challenges. Beyond agriculture, mice are invading homes in regional communities, chewing through food containers and overwhelming pest control efforts, with some residents reporting infestations worse than ever before. Experts emphasize the need for immediate action to prevent further losses, though differing reports highlight variations in severity—some sources citing extreme localized outbreaks while others frame concerns as regionally widespread but not yet at peak levels.
✓ Verified by 2+ sources
Key details reported by multiple sources:
- CSIRO research officer Steve Henry reported mouse numbers exceeding 2,000–8,000 per hectare in WA cropping zones (Mid-West, Wheatbelt, Goldfields-Esperance) in 2023, with 4,000 burrows per hectare found in some paddocks.
- Farmers in Western Australia are facing a plague-level mouse outbreak impacting cereal crops (wheat, barley, canola) worth over $1 billion in production losses.
- Steve Henry warned mice are consuming freshly sown seeds, causing significant yield losses, particularly in canola where destroyed seedlings result in total crop failure.
- Cyclonic rains in WA have worsened the plague by creating favorable breeding conditions for mice, with numbers expected to surge further due to warm temperatures.
- Farmers require federal approval to access high-strength mouse bait (ZP-50), which is currently unavailable without regulatory exemption.
- Mice are invading homes in regional WA communities, chewing through food containers and plastic, with pest controllers reporting unprecedented infestation levels.
- CSIRO data shows mice can breed prolifically, with females producing 6–10 offspring every 19–21 days and becoming pregnant again within days, leading to exponential population growth.
Points of Difference
Details reported by only one source:
- WA Farmers chief executive Trevor Whittington stated the plague is one of the worst outbreaks threatening $1bn of grain production, compounded by fuel crises, fertilizer shortages, and low grain prices.
- Farmer Belinda Eastough noted that leftover grain from past harvests has provided shelter and food for mice, exacerbating the plague since spring.
- Eastough mentioned farmers are catching about 40 mice per day inside homes during past plagues, and called for emergency payments to help mitigate losses.
- She highlighted that current bait effectiveness is reduced when other food sources are abundant, as mice may avoid lethal doses.
- Pest controller Peter Cekanauskas reported finding a dozen mice in his pantry after a week away, with 7.5kg of bait consumed in less than three days (estimated to kill ~75kg of mice).
- A resident told Steve Henry mice chewed through a plastic container of rolled oats and nibbled UHT milk cartons, causing leaks.
- Henry noted a supplier remarked on increased sales of mouse control chemicals in the affected regions.
- Videos shared by Henry showed hundreds of mice running around at Ravensthorpe’s seed cleaner facility.
Contradictions
Conflicting information between sources:
- NEWSCOMAU states farmers are seeing up to 8,000 mice per hectare in some paddocks, while ABC only reports concerns at 200–300 mice per hectare as 'cause for concern' without citing 8,000.
- NEWSCOMAU mentions farmers are unable to access ZP-50 bait without federal approval, but ABC does not explicitly state this regulatory barrier.
- NEWSCOMAU attributes the plague’s severity to leftover grain from past harvests creating shelter, while ABC does not mention this specific cause.
- ABC highlights a pest controller’s personal experience with 7.5kg of bait being eaten in three days, but NEWSCOMAU does not provide such granular bait consumption data.
- NEWSCOMAU quotes Belinda Eastough calling for emergency payments, while ABC does not reference this demand.
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