Not considered a problem in cereal or oilseed crops. This weed is a prolific seed producer. Scouting Techniques Take a minimum of 20 weed counts across the field. Effects on Crop Quality Contains pyrrolizidine alkaloids that the liver converts into toxic pyrroles. These are toxic to horses, swine, and cattle.
Sheep are less susceptible.
Chronic cases result from small daily doses over a period of weeks or months.