Johnson grass (Sorghum halepense)

Profile

How does this weed affect you?

Johnson grass is a serious weed in most parts of the world. It is a summer growing perennial sorghum which grows up to two metres tall.

Johnson grass can be spread by seeds through contaminated hay, grain and seed and by rhizomes by cultivation and roadside grading. It invades cropping land, is a host of crop pests and diseases, is a contaminant of seed crops, is a safety hazard along roadsides and can be toxic to livestock.

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Control

Herbicide options

WARNING - ALWAYS READ THE LABEL
Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website www.apvma.gov.au

See Using herbicides for more information.


Flupropanate 745 g/L (Tussock®)
Rate: 200 mL per 15 L of water
Comments: Knapsack spray.
Withholding period: Don't graze cows or goats that are being milked on treated areas. Blanket sprayed pastures - grazing or cutting for stock feed - 120 days. Spot sprayed areas - grazing or cutting for stock feed - 14 days. Don't graze stock on treated areas for 14 days prior to slaughter.
Herbicide group: J, Inhibitors of fat synthesis (Not ACCase inhibitors)
Resistance risk: Moderate


Flupropanate 745 g/L (Tussock®)
Rate: 1.0 L per 100 L of water
Comments: High volume spot spray.
Withholding period: Don't graze cows or goats that are being milked on treated areas. Blanket sprayed pastures - grazing or cutting for stock feed - 120 days. Spot sprayed areas - grazing or cutting for stock feed - 14 days. Don't graze stock on treated areas for 14 days prior to slaughter.
Herbicide group: J, Inhibitors of fat synthesis (Not ACCase inhibitors)
Resistance risk: Moderate


Flupropanate 745 g/L (Tussock®)
Rate: 12 L/ha
Comments: Boom spray.
Withholding period: Don't graze cows or goats that are being milked on treated areas. Blanket sprayed pastures - grazing or cutting for stock feed - 120 days. Spot sprayed areas - grazing or cutting for stock feed - 14 days. Don't graze stock on treated areas for 14 days prior to slaughter.
Herbicide group: J, Inhibitors of fat synthesis (Not ACCase inhibitors)
Resistance risk: Moderate


Glyphosate 360 g/L (Roundup®)
Rate: 1.0 L per 100 L of water
Comments: Spot spray.
Withholding period: Nil.
Herbicide group: M, Inhibitors of EPSP synthase
Resistance risk: Moderate


Glyphosate 360 g/L (Roundup®)
Rate: 6.0 L/ha
Comments: Boom spray. Actively growing plants at early head stage.
Withholding period: Nil.
Herbicide group: M, Inhibitors of EPSP synthase
Resistance risk: Moderate


Glyphosate 360 g/L (Roundup®)
Rate: 1.0 L glyphosate per 2 L of water
Comments: Wiper equipment.
Withholding period: Nil.
Herbicide group: M, Inhibitors of EPSP synthase
Resistance risk: Moderate


Haloxyfop 520 g/L (Verdict® )
Rate: 200 - 400 mL/ha
Comments: Boom spray application
Withholding period: 7 - 28 days
Herbicide group: A, Inhibitors of fat synthesis (ACC'ase [acetyl coA carboxylase] inhibitors)
Resistance risk: High


Imazapyr 750 g/kg (Various products)
Rate: 2 kg/ha
Comments: Boom spray application
Withholding period: Do not graze or cut for stock feed.
Herbicide group: B, Inhibitors of acetolactate synthase (ALS inhibitors)
Resistance risk: High


MSMA 720 g/L (Armada 720 SL)
Rate: 1.1 L per 100 L of water
Comments: Spot spraying.
Withholding period: 5 weeks.
Herbicide group: Z, Herbicides with unknown and probably diverse sites of action
Resistance risk: Moderate


MSMA 720 g/L (Armada 720 SL)
Rate: 11–13.3 L/ha in 500 L of water
Comments: Boom spraying.
Withholding period: 5 weeks.
Herbicide group: Z, Herbicides with unknown and probably diverse sites of action
Resistance risk: Moderate


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Biosecurity duty

The content provided here is for information purposes only and is taken from the Biosecurity Act 2015 and its subordinate legislation, and the Regional Strategic Weed Management Plans (published by each Local Land Services region in NSW). It describes the state and regional priorities for weeds in New South Wales, Australia.

Area Duty
All of NSW General Biosecurity Duty
All plants are regulated with a general biosecurity duty to prevent, eliminate or minimise any biosecurity risk they may pose. Any person who deals with any plant, who knows (or ought to know) of any biosecurity risk, has a duty to ensure the risk is prevented, eliminated or minimised, so far as is reasonably practicable.
Central West Regional Recommended Measure*
Land managers should mitigate the risk of new weeds being introduced to their land. Land managers should mitigate spread from their land. The plant should not be bought, sold, grown, carried or released into the environment.
*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfill the general biosecurity duty for this weed click here

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Reviewed 2017