Yellow-flowered devil’s claw is a low-growing annual plant to 50 centimetres high and spreading to 1.5 metres wide. It has large round or kidney-shaped leaves and yellow trumpet-shaped flowers with purple spots inside the throat. The woody seed capsules open into pairs of curved horns (10 centimetres long). The weed is spread when the clawed seed capsule attaches to livestock, particularly the feet and heads of sheep (consequently causing injuries).
Infestations occur in isolated patches, often on roadsides and around stock camps. The leaves have an unpleasant odour and are not eaten by stock. Plants will compete with summer crops.
Yellow-flowered devil’s claw is native to America.
See Using herbicides for more information.
2,4-D LV ester 680g/L
Rate: 1.15 to 1.7 L/kg
Comments: Boom spray application, before pods form.
Withholding period: 7 days
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
Devil's claw - yellow-flowered (Ibicella lutea) is not declared in NSW under the Noxious Weeds Act 1993.