St George disease

Veterinary advice should be sought before applying any treatment or vaccine.

St George Disease

Pimelea Trichostachya Poisoning

St George disease is another name for pimelea trichostachya poisoning, which is caused by the consumption of Pimelea trichostachya plants. Two separate cases of poisoning were reported in horses and cattle living in Australia. Both incidents involved pastures overrun with Pimelea species of plants.

The first case of St george disease that was reported in horses occurred in South Australia in 2002, followed by an outbreak in a herd of 10 horses in southern inland Queensland in October-November 2005.


Weight loss
Nasal discharge
Watery diarrhea


  • History
  • Clinical signs
  • Physical exam
  • Laboratory tests


Management: Relocate the horse to a different pasture, free from Pimelea species of plants.


  • Know what is growing in pastures, don't let horses graze in pastures containing Pimelea species of plants.

Scientific Research References

Good Overviews

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Risk Factors

  • Letting horses graze on pastures containing Pimelea species of plants