Blowfly strike is one of the most serious welfare and production issues facing Australian sheep producers. In Queensland's warm, humid conditions, the risk period extends almost year-round in some regions.
What Causes Blowfly Strike?
The primary blowfly species in Australia is the Australian sheep blowfly (Lucilia cuprina). Female flies are attracted to moist, soiled wool — particularly around the breech, pizzle, and wounds. Maggots can cause severe tissue damage within 24–48 hours if left untreated.
Signs of Blowfly Strike
- Sheep biting or kicking at affected area
- Discoloured, wet, or matted wool
- Strong odour from the struck area
- Maggots visible in the wool or on the skin
- In severe cases — depression, going off feed, and death
Treatment
Remove all maggots manually and clip the wool from the affected area. Apply a registered wound treatment such as Extinosad (spinosad) or Maggo (cyromazine). In severe cases consult your vet.
Prevention Programs
Mulesing remains the most effective long-term prevention in Merino flocks. Combined with chemical prevention, it significantly reduces strike risk.
Chemical prevention products include Clik Extra (dicyclanil), Cyrex (cyromazine), and Vetrazin (cyromazine). Always apply as per the current registered label — protection duration varies with wool length, application rate, and seasonal conditions. Browse our full Sheep Products range.
Shop Blowfly Products at TGRM
TGRM stocks Clik Extra, Cyrex, Vetrazin, Extinosad and wound treatments. Talk to our team for the right program for your flock. Gympie QLD — 07 5482 1692.
Related reading: Sheep Drench Resistance Program | Understanding Withholding Periods