Parthenium weed outbreak

01 May 2020

parthenium weedHave you seen this plant? Parthenium weed invades pastures and crops, can cause severe human health problems including respiratory problems and severe dermatitis and can also cause health problems in livestock.

Parthenium weed:
● is unpalatable to livestock
● outcompetes pastures
● can taint meat or milk
● reduces crop yields
● contaminates grain
● is a host plant for crop viruses.

Parthenium weed has recently been found near Walgett, Forbes, Narrabri and Engadine. It may also have spread into other locations in NSW. Look for it along roadsides, especially those that have regular traffic from Queensland such as the Newell Highway.

Check areas where grain and hay have been fed to livestock, especially if it may have come from Queensland. Check regularly and especially after rain.

What does it look like?

  • It usually grows up to 1.5 m tall but can be up to 2 m tall.
  • Leaves are pale green and covered in soft fine hairs.
  • Lower leaves are 5–20 cm long and deeply divided. Upper leaves are smaller and less divided.
  • Flowers are creamy white, 4–6 mm across and star-like with 5 distinct corners. Flower clusters are delicate and look a bit like "baby's breath".
  • Stems are grooved, woody when older, and have many branches when flowering

Have you seen this plant? If you have call 1800 680 244

Help protect our farms and grazing lands.

For control and biosecurity information visit NSW WeedWise:

parthenium weed collage