Crofton weed (Ageratina adenophora) is an erect, many-stemmed, perennial herb or shrub which is considered to be an invasive weed in many areas of the world, especially Australia. It has purplish, smooth stems which are shortly branched towards the apex. A. adenophora become slightly woody and turn brownish-green or brown in color when mature. Its roots are yellowish in color and give off a distinct carrot-like smell when broken or damaged. The leaves are broad, slightly crinkled, trowel-shaped, and toothed with chocolate-colored petioles. Dense clusters of white flowers develop in the spring and summer.
Crofton Weed Toxic Components
A. adenophora is highly toxic to horses if ingested. Unfortunately, crofton weed is palatable to horses, and if available to them in pastures, they will seek it out to consume. Following several weeks of grazing the plant, horses will start to cough frequently, quickly followed by exercise intolerance, depression, and death.
Consumption of the plant by horses causes whats known as “blowing disease” in Hawaii and “Numinbah disease” or “Tollebudgera horse disease” in Australia. Symptoms might take several years to become noticeable.
- Frequent Coughing Made Worse With Exercise
- Exercise Intolerance
- Depression
- Shortness Of Breath
- Condition Loss
- Collapse
- Respiratory Distress
- Heart Failure
- Death
PHYSICAL CONTROL: Small areas of scattered plants can be dug out with a mattock. Crowns must be removed to prevent regrowth.
MECHANICAL CONTROL: Slashing is often used to control heavy infestations on accessible land. Regular slashing will reduce flowering and seedset, thus reducing spread by se
