Comparative performance of Group 14 herbicides against advanced milk thistle

2025

Research organisations
Funding source

Trial details

Researcher(s) Mitch Buster
Mark Congreve
Contact email mark@icanrural.com.au
Contact phone 0294824930
Year(s) 2025
Contributor ICAN Rural
Trial location(s) Spring Ridge, NSW
Comparative performance of Group 14 herbicides against advanced milk thistle locations
Aims
  • Understand the relative performance of Group 14 standards at high and low label rates +/- paraquat
  • How does epyrifenacil compare to existing standards at 'expected' use rates.
Key messages

Carvero and Voraxor provided good levels of brownout at the 25DAA assessment when applied alone. Numerically, tank mixing paraquat with either herbicide tended to reduce control, although this was not statistically significant. 

Sharpen treatments (+/- paraquat) tended to fall somewhere between the Terrad’or treatments and the Carvero or Voraxor treatments, with no dose response evident.  

A subsequent germination of deadnettle (Lamium purpureum) occurred before the 25DAA assessment (data not shown). While there was some unevenness in germination across the trial, some observations can be made: 

• Paraquat and Terrad’or alone or in combination provided very little / no residual activity against deadnettle at this assessment timing 

• Sharpen at both rates (+/- paraquat) provided some useful level of residual activity at 25DAA, although control was variable between treatments. The variability across treatments may be reflective of uneven deadnettle pressure across the site. 

• The four Carvero treatments (alone or with paraquat) were all rated between 7 and 9 out of 10 for residual control of deadnettle at 25DAA 

Lead research organisation Independent Consultants Australia Network Pty Ltd
Host research organisation AMPS Agribusiness
Trial funding source GRDC ICN2404-002RTX;ICN2403-002RTX
Related program N/A
Acknowledgments N/A
Other trial partners Not specified
Download the trial report to view additional trial information

Method

Crop type Weed: Other broadleaf
Treatment type(s)
  • Herbicide : Type
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Spring Ridge 2025

Sow date Not applicable
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Spring Ridge, NSW Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Spring Ridge, NSW Chromosol

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.

Spring Ridge NSW

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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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

Comparative performance of Group 14 herbicides against advanced milk thistle



Trial last modified: 27-08-2026 11:41am AEST