Knockdown options for glyphosate resistant ryegrass

2015

Research organisaton
Funding source

Trial details

Researcher(s) Kelly Angel (BCG)
Simon Monk (Clovercrest Consulting)
Year(s) 2015
Contributor Birchip Cropping Group
Trial location(s) Lillimur, VIC
Further information View external link
Knockdown options for glyphosate resistant ryegrass locations
Aims

To investigate the effectiveness of the use of different herbicides and spraying regimes prior to sowing in controlling annual ryegrass and to increase grower awareness of rotating the various knockdown options pre-sowing.

Key messages
  • It is no longer a question of whether ryegrass will become resistant; it is when! 
  • Double knock was the most effective treatment for managing this ryegrass population  (98% control).
  • Alternative crop options should be integrated into the rotation to manage weeds and reduce the reliance of glyphosate. 
  • High water rates, spraying closer to evening and no later than 7-10 days after the initial knockdown are essential when using Paraquat.
Lead research organisation Birchip Cropping Group
Host research organisation N/A
Trial funding source GRDC CLO00001
Related program Agribusiness Trial Extension Network
Acknowledgments

This trial was funded by the GRDC as part of the ‘Agribusiness Trial Extension Networks: Identify options for the control of glyphosate resistant ryegrass’ project (CLO00001).


Other trial partners Not specified
Download the trial report to view additional trial information

Method

Crop type None: No crop specified
Treatment type(s)
  • Herbicide: Rate
  • Herbicide: Timing
  • Herbicide: Type
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Lillimur 2015

Sow rate or Target density 1500 plants/m2
Sow date Not specified
Harvest date Not specified
Plot size 20m x 6m
Plot replication Not specified
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
28 days after application (days) Weed control (%) Initial weed count ((no. of plants))
1 Control 1412 0 1412
2 SL 3825 (2L) 1143 21.5 1355
3 Alliance (1.5L) 861 45.4 1640
4 Alliance (2L) 721 48.1 1363
5 Gramozone (2L) 624 50.4 1384
6 Para-Trooper (2L) 437 73.8 1634
7 SL 3825 (2L) + Gramoxone (1L) 260 76.8 1195
8 Goal (200ml) + Gramoxone (2L) 439 78.5 1676
9 SL 3825 (2L) + Gramoxone (2L) 242 83.4 1580
10 Glyphosate (1L) 181 87.9 1259
11 Boxer Gold (2.5L) + Gramoxone (2L) 149 89.8 1480
12 Glyphosate (1L) fb Gramoxone (2L, 7 days) 17 98.6 1280

28 days after application days


Loading

Initial weed count (no. of plants)


Loading

Weed control %


Loading
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Lillimur, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Lillimur, VIC Vertosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Lillimur VIC
2015 353.8mm
2014 366.6mm
2013 383.1mm
2012 415.1mm
2011 440.4mm
2010 453.7mm
2009 444.6mm
2008 435.3mm
2007 493.0mm
2006 465.2mm
2005 436.9mm
2004 430.7mm
2003 479.4mm
2002 448.5mm
2001 513.0mm
2000 564.3mm
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

Loading

Climate

Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Lillimur VIC

Loading
Loading
Loading

Some data on this site is sourced from the Bureau of Meteorology

SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.

Trial report and links

2015 trial report



Trial last modified: 08-05-2019 09:25am AEST