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October 2011


Welcome to the latest NGA newsletter and a snapshot of the 2011/12 summer program. The crossover between winter and summer programs is always the hardest part of the year with many winter trial assessments (and of course harvest) still to take place whilst the summer trials are already kicking off.

Although 2011 has seen much lower foliar disease pressure than experienced last year, we are currently capturing some valuable disease data on Spot Form Net Blotch, Barley Leaf Rust and also Yellow Spot management. The real measure, of course, will be at harvest with yield/grain quality and the resultant economic impact.

Awnless Barnyard Grass Resistance Survey – please take the time to look at the side bar article on this survey. Glyphosate resistance in barnyard grass is a major production threat and the industry needs to baseline the current resistance status as part of our long term management. 

2011/12 Summer Trial

Two trials investigating the optimal application timing of paraquat double knocks after initial application of glyphosate or other grass active herbicides. Two trials evaluating a range of residual herbicide herbicides for both FTR and general weed spectrum. Two trials examining the compatibility of a selective grass herbicide with a range of broadleaf herbicides for potential use in a fallow situation. We are still looking for additional sites with uniform pressure of FTR. 
Four trials to be conducted in fallow, screening for effective double knock herbicide combinations that don’t contain a phenoxy (hormone) product in the first knock. Although these alternative products are not viable as standalone control options they may be suitable when followed by a paraquat application. 
Three trials evaluating paraquat efficacy against fleabane to quantify the level of benefit gained from additives including ‘spike rates’ of other herbicides, nozzle choice or day versus night spraying.
Three trials to compare herbicide control strategies on resistant ABYG populations, evaluating alternative products alone and in combination with glyphosate.

A survey of ABYG resistance levels, in collaboration with NSW DPI and DEEDI, is being planned for the 2011/12 fallow. Intention is to involve ~ 40 agronomists across northen NSW and southern Qld to collect surviving plant samples from up to 5 different paddocks. These samples will be screened by NSW DPI at Tamworth. For more information see the side bar article in this newsletter.

Small plot activity in collaboration with Pacific Seeds to evaluate N, P and S responses in sorghum near Moree.

NGA is working with DEEDI, Pioneer and Pacific Seeds to generate more information on summer crop variety impact on the build-up of root lesion nematodes. Evaluation in summer 2011 will focus on mungbeans and sorghum.

Large scale comparisons of a range of boom setups evaluating travel speed, boom height, nozzle type etc for commercial camera spray setups. Will need co-operators willing to vary these parameters.

Three trials to screen a range of current and potential herbicide options in mungbean. Trials to be conducted in Crystal and the next variety expected to be released.

Two trials to screen a range of herbicide options for a localised but difficult to manage weed. Main challenge is finding sites with a suitable population and area of weed infestation for effective comparisons. We are looking for suitable sites with history of scurvy weed problems.  
Copyright © 2011 Northern Grower Alliance, All rights reserved.

In This Issue

  • 2011/12 Summer Trial Snapshots
  • Awnless Barnyard Grass Resistance Survey
  • Weemelah Root-Lesion Nematode Field Day 
  • 2011 Aphid Management Survey Results  Res   R   /

Awnless Barnyard Grass Resistance Survey

NGA is collaborating with DEEDI and NSW DPI to provide samples for a regional glyphosate resistance survey. We are seeking ~20 agronomists/ consultants in northern NSW and a similar number in southern Qld to provide samples from a maximum of 5 zero till fallow paddocks each for testing. The intention is for paddocks to be selected prior to spray application and only those with survivors will need to be sampled.

Samples will be sent to NSW DPI Tamworth for ‘quick test’ herbicide evaluation. Sample kits and instructions will be provided to each agronomist. The value for agronomists and their growers is the ability to get a free test to help determine the cause of a barnyard grass spray failure. The value for the industry will be to get a much better understanding of the extent of glyphosate resistance and perhaps also identify some common causes of spray problems.

If you are interested in participating, please click on the link below.
ABYG survey   

Weemelah Root-Lesion Nematode Field Day

A very successful field day was held at this site on Tuesday 20thSept. Attendance was tremendous - in excess of 80 attendees - with a good mix of growers and agronomists.  Thanks again to our co-operators Bill and Andrew Yates and the large number of presenters. The two key measures from this trial will of course be yield/economics but then also following through to assessment of nematode multiplication with soil coring in autumn 2012.

The photo below shows part of the crowd with the two plots in foreground being Commander and Skiff barley
2011 Aphid Management Survey Results 

We have closed this survey with 76 responses received (~59% overall response rate). Response rates over 60% were received from the Moree/Narrabri, Darling Downs and Liverpool Plains LCCs. Thank you to all who participated. The link below will take you directly to the results.
One interesting point -
Q3 What aphid species are of management concern in winter cereals ?
The three common winter cereal species (oat aphid, corn aphid and rose grain aphid) were selected by 50-70% of respondents. Interestingly green peach aphid was selected quite frequently although it is generally considered a pest of cotton and canola. We would be keen to hear from anyone who is seeing green peach aphid causing issues in winter cereals.

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Northern Grower Alliance · PO Box 78 · Harlaxton, QLD 4350 · Australia

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