Three corner jack
Emex australis
Weed profile
Annual
Herb
Toxic to livestock- Habitat: pastures
Impact
Competes in pastures and crops. Spiny seeds. Toxic.
Description
- Winter growing annual.
- Stems prostrate to semi-erect.
- Leaves ovate, stalked, hairless.
- Flowers tiny, green.
- Seeds in hard burrs each with 3 spines.
Control options
metsulfuron-methyl (600g/kg)
Application Method: Boom spray
Application Rate: 5-10g/ha
Product Name: Brush-Off®
Herbicide Group: 2
Situation: Grass pastures
Timing: Boom spray, up to 6 leaf weed stage.
Comments:
Established pastures - refer to label.
Soil active herbicide, may damage desirable vegetation.
Use the higher rate for dense infestations.
Legal Status: Product and use are registered, but this weed is on the label for WA only.
terbutryn 275g/L + MCPA (160g/L)
Application Method: Boom spray
Application Rate: 1.5L/ha
Product Name: Agtryne MA®
Herbicide Group: 5,4
Situation: Wheat, barley, and some oat cultivars only
Timing: Boom spray, at 2-6 leaf weed stage, 3-5 leaf crop stage.
Comments: Do not add a surfactant or spraying oil. Do not apply to crops undersown with legumes.
Legal Status: Registered
metsulfuron-methyl (600g/kg)
Application Method: Boom spray
Application Rate: 5-7g/ha
Product Name: Ally®
Herbicide Group: 2
Situation: Wheat, barley, triticale and cereal rye crops.
Timing: Boom spray, post emergence
Comments: Soil active herbicide, may damage desirable vegetation. Use the higher rate for larger weeds.
Legal Status: Registered
glyphosate (450g/L)
Application Method: Boom spray
Application Rate: 800mL-1.2L/ha
Product Name: Roundup CT®
Herbicide Group: 9
Situation: Pre-sowing.
Timing: Boom spray, rosettes more than 8 cm diameter
Comments: Non selective, avoid contact with desirable plants.
Legal Status: Registered
glyphosate (450g/L)
Application Method: Boom spray
Application Rate: 400-800mL/ha
Product Name: Roundup CT®
Herbicide Group: 9
Situation: Pre-sowing.
Timing: Boom spray, rosettes less than 8 cm diameter
Comments: Non selective, avoid contact with desirable plants.
Legal Status: Registered
Legal requirements in each region
Land owners in this region to take reasonable steps to kill plants and prevent their spread. Enforceable by the Alinytjara Wiluṟara Landscape Board.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Land owners in this region to take reasonable steps to kill plants and prevent their spread. Enforceable by the Eyre Peninsula Landscape Board.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Land owners in this region to take reasonable steps to kill plants and prevent their spread. Enforceable by the Kangaroo Island Landscape Board.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Land owners in this region to take reasonable steps to kill plants and prevent their spread. Enforceable by the Limestone Coast Landscape Board.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Land owners in this region to take reasonable steps to kill plants and prevent their spread. Enforceable by the Murraylands and Riverland Landscape Board.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be imported into the region.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
Must not be sold or traded in any way, including as a contaminant of anything.
Must not be transported on a public road, including as a contaminant of anything.
More Information
Find out how to:
- benefit from the early intervention of new and emerging weeds - handbook
- best manage your use and storage of agricultural and veterinary chemicals.
Control advice
For further help and advice managing this weed contact your regional landscape board: