North West Weeds
 
          Your local guide to local noxious weed control (NSW, Australia)
Galvanised burr

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North West Weeds
ABN 16 052 158 879
Postal address:
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BINGARA
NSW 2404

Identification Effect on animals More info? Control methods Using pesticides Disclaimer

A native of Australia, the presence of galvanised burr (Sclerolaena birchii) in any area is usually an indication of overgrazing and/or drought conditions.  Galvanised burr is widespread in north-west New South Wales.

Galvanised burr has a role:  it's hardy and will survive under the toughest conditions.  During extended drought periods, galvanised burr can often be the only plant growing on sandy or otherwise bare ground.  It helps to hold the ground together, reducing soil erosion, and catches windblown leaves and soil etc, creating a small, sheltered "zone" for grasses and other plants to establish in.

Not an easy plant to eradicate, because of its effective seed dispersal methods and persistence of the seeds.  Herbicides will take out galvanised burr, but "the cure can sometimes be worse than the complaint".  Careful use of herbicides (avoiding overkill of desirable plant species), and/or grazing management is the most effective means of control - given some rainfall opportunities.

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EFFECT ON ANIMALS

Galvanised burr reduces stock-carrying capacity.  The burrs are a contaminant in wool, and an annoyance to people that have to handle sheep.  The burrs are not generally considered a major vegetable fault in the wool

IDENTIFICATIONClose up of galavanised burr

The word "galvanised" is a good descriptor of the plant's blue-green colour.  A very woody plant, pieces of the stems eventually drop off or attach to animals as the plant disperses its many seeds

MORE INFORMATION"Noxious Plants of Australia" by Parsons and Cuthbertson (Inkata Press)

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CONTROL METHODS

According to NSW DPI’s excellent booklet “Noxious and Environmental Weed Control Handbook 3rd Edition”, treatments for galvanised burr include:

Non-Chemical Options: Deep cultivation to bury the seed with pasture improvement and grazing management will give control;

Chemical options

Rate: Spot/Boom

Comments

Dicamba 500 g/L
Various trade names and formulations

130 mL per 15 L of water
600 mL per 100 L of water
8.8 L per hectare

Knapsack spot spray
High volume spot spray
Boom spray. Use a minimum of 1500 L water  per hectare.  Add a surfactant
.

2.4-D amine 500 g/L
eg Nufarm Estercide 800®

400 ml in 100 L of water

Apply to young, actively-growing plants.

Dichlorprop 600 g/L
eg Lantana DP 600®

1.0 L in 100 L of water

Apply to young, actively-growing plants.

Other registrations - not included in DPI booklet:

Metsulfuron methyl 600 g/kg
Various trade names
eg Brushoff® and Ally®

2.5g, 5g or 10g per 100 L of water
5g, 10g or 15g per hectare

Spot spray - non-crop areas eg roadsides

Boom spray - pastures
Other comments
1) use higher rates for mature plants or heavy infestations
2) apply to actively growing plants
3) refer to product label, especially recommendation re surfactant
4)  full details see Permit 8936           

IMPORTANT:  USE OF PESTICIDES – ALWAYS READ THE LABEL

Pesticides must only be used for the purpose for which they are registered and must not be used in any other situation or in any manner contrary to the directions on the label.  Never use a herbicide in any way contrary to the label recommendations.

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DISCLAIMER:   The information contained in this web site is based on knowledge and understanding at the time of writing. However, because of advances in knowledge, users are reminded of the need to ensure that information upon which they rely is up to date and to check currency of the information with the appropriate officer of North West Weeds or the user’s independent adviser.
LRT 17/10/2006

Send mail to lestanner@aapt.net.au with questions or comments about this web site.
Copyright © 2007-2008 Last modified: 22/06/08 - L R Tanner