In NSW Annual Ryegrass Toxicity is associated with the pasture species blowngrass (Agrostis avenaceae)and has been refered to as floodplain staggers.

Annual ryegrass toxicity (ARGT) is caused by the bacterium Rathayibacter toxicus.
This bacteria is carried by a nematode into the developing seed heads of some annual grasses, where it eventually produces a powerful tunicamycin-like poison called corynetoxin.
The most commonly affected plants include annual Wimmera ryegrass (Lolium rigidum) and blowngrass (Agrostis avenaceae).
The toxin may cause disease in cattle, sheep, goats, horses and pigs consuming infected seed heads.
Initial clinical signs include a reluctance to move and uncoordinated gait when driven. The death rate from ARGT can be very high.

Contributor Peter White and Peter Windsor

Clinical Findings
Lolium rigidum poisoning


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