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Coolatai grass (Hyparrhenia hirta) has taken over large areas of the north west and is still spreading. It continues to cause serious ecological damage within national parks and the like, where it displaces other desirable plant species.

Coolatai grass burns with intense heat, and in an uncontrolled fire event can cause severe damage to

NWW3358WX-Coolatai grass starting to dominate this paddock near Delungra NSW

NWW3358WX-Coolatai grass starting to dominate this paddock near Delungra NSW

desirable trees and shrubs, fences, buildings, as well as threaten livestock and human life.

The grazing problem

Coolatai grass is generally regarded as a weed because of its low digestibility. Stock usually avoid Coolatai grass in favour of other grasses, eventually “flogging out” all of the good grasses and providing more space for the Coolatai grass to flourish.

The hardy nature of Coolatai grass has meant it being the only feed available in many lighter-soil areas during extreme drought conditions.

NWW3351 Coolatai grass close-up of seed heads

NWW3351 Coolatai grass close-up of seed heads

Stock can survive on Coolatai grass, with assistance from feed supplements. According to research carried out by NSW Dept of Primary Industries (DPI), grazing management, soil nutrition and legume species can improve the value of Coolatai grass.

For information on these options contact NSW DPI agronomists at Tamworth NSW or from the NSW DPI website download a copy of Management of Coolatai Grass on the North West Slopes of NSW (written by NSW DPI agronomists Bob McGufficke and Lester McCormick).

NWW3355WX-Coolatai-grass-taking-over-paddock-Bingara-Delungra-Rd-opp-Michelle-Lane

NWW3355WX-Coolatai-grass-taking-over-paddock-Bingara-Delungra-Rd-opp-Michelle-Lane

Photo (right) shows an example of how Coolatai grass can dominate grazing areas. Photo taken from roadside between Bingara and Delungra NSW

Coolatai grass has an amazing capacity to spread. During its seeding phase, the plant produces thousands of tiny, sticky seeds which adhere readily to animals, farm machinery and motor vehicles.

Little wonder Coolatai grass continues to spread throughout New South Wales!

More information:
NWW3356 Coolatai grass - thriving in compacted gravel roadside edge Bingara NSW

NWW3356 Coolatai grass – thriving, even in compacted gravel roadside edge – Bingara NSW

Visit NSW DPI’s website and the informative Coolatai grass webpage. Coolatai grass is now a declared noxious weed in some southern parts of New South Wales.

Control: Every effort should be made to prevent Coolatai grass from becoming established in new areas. Treatment – either manual removal or herbicide application – is advisable before plants have a chance to produce seed. Regular follow-up is essential to prevent further establishment.

Herbicides?  TWO PERMITS CURRENTLY IN PLACE FOR NSW:

PLEASE READ AND FOLLOW PERMIT DIRECTIONS –

1.  Permit PER9792  relates to both SPOT SPRAY and BROADACRE applications. It also includes rates for WIPER applications (not included below). This permit is in force from 24 Feb 2010 until 30 November 2015.

Herbicide   Rate: Spot/Boom    Comments
Glyphosate options various trade names
360 g/L
450 g/L
540 g/L
OR Fluproponate eg Tussock Herbicide® 745 g/L
IN WATER
2.0 L in 100 L
1.6 L in 100 L
1.3 L in 100 L300 mL in 100 L
SPOT SPRAY SUPPRESSION – only in situations listed for the herbicide: Apply herbicide solution to Coolatai grass to the point of run-off from leaf surfaces using high volume spot spray applicators. Timing: best time for glyphosate is Sept to May, repeat treatments will be necessary – fluproponate best time Jul to Oct, once per season. SEE FULL DETAILS in Permit PER9792  (included on page 8 of this 17 page permit)
Glyphosate options various trade names
360 g/L
450 g/L
540 g/L
OR
Fluproponate eg Tussock Herbicide® 745 g/L
IN WATER
6.0 L / ha
4.8 L / ha
4.0 L / ha3.0 L / ha
BROADACRE SUPPRESSION – only in situations listed for the herbicide: Apply herbicide solution to Coolatai grass to the point of run-off from leaf surfaces – 1000-2000 L per hectare. Timing: best time for glyphosate is Sept to May, repeat treatments will be necessary – fluproponate best time Jul to Oct, once per season. SEE FULL DETAILS in Permit PER9792  (included on page 8 of this 17 page permit)
Glyphosate options various trade names
360 g/L
450 g/L
540 g/L
PLUS
Fluproponate eg Tussock Herbicide® 745 g/L
IN WATER
2.0 L in 100 L
1.6 L in 100 L
1.3 L in 100 L200 mL in 100 L
SPOT SPRAY – SEED CHECK – only in situations listed for BOTH herbicides: Apply herbicide solution to Coolatai grass to the point of run-off from leaf surfaces using high volume spot spray applicators. Timing: Apply to actively growing plants before flowering – addition of fluproponate is most effective during spring, apply between July and Oct. Use this tank mix once per season. Rates: mix fluproponate with glyphosate. SEE FULL DETAILS included in Permit PER9792  (included on page 8 of this 17 page permit)


2
. Permit PER12461 relates to both SPOT SPRAY applications. THIS PERMIT IS IN FORCE FROM 28 MAY 2012 TO 30 NOVEMBER 2015.

Arsenal Xpress® herbicide or other registered products containing: 150 g/l imazapyr present as isopropylamine salt and 150 g/l glyphosate present as the isopropylamine saltPLUS Roundup® herbicide by Monsanto or other registered products containing: 360 g/l glyphosate present as the isopropylamine salt as their only active constituent. 2 L Arsenal Xpress
plus
2.0 L Roundup 360 g/L
in 100 L water
Critical Use Comments:  Apply as a foliar spot spray. Use a carefully directed spray; consider shielded nozzles. To ensure best herbicide use, measure and calibrate application volumes, apply as an even spray pattern with complete and uniform wetting of all foliage, using a coarse spray quality. Apply in typically 500 to 1000 L application volume per hectare. Withholding Period: DO NOT GRAZE OR CUT FOR STOCK FEED, VEGETATION WHICH HAS BEEN TREATED WITH ARSENAL XPRESS FOR 7 WEEKS AFTER APPLICATION. Jurisdiction: NSW only. Roadside infestations or other non-agricultural situations described on the current Arsenal Xpress® label (around agricultural buildings and other farm non-crop situations, commercial, industrial and public service areas, rights of way and waste land; away from non-target vegetation) SEE FULL DETAILS included in Permit PER12461

IMPORTANT:  USE OF PESTICIDES – ALWAYS READ 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.

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 2/08/2015