Health Factsheet

Annual Rye Grass Toxicity in Horses

Background Annual ryegrass toxicity (ARGT) is a serious and increasingly more common toxicity of horses that consume annual ryegrass infected by the bacterium Rathayibacter toxicus. The bacterium is carried into the ryegrass by a nematode, Anguina funesta, and produces toxins within seed galls from the end of flowering, through seedset, to seed maturity. Toxicity develops …

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