Researcher(s) |
Nick Poole Darcy Warren |
---|---|
Year(s) | 2021 |
Contributor | Field Applied Research (FAR) Australia |
Trial location(s) |
Wallendbeen, NSW
|
To develop profitable and sustainable approaches to disease management in high yielding and HRZ regions.
Individual objectives specific to the trial were:
- To evaluate whether newer germplasm or new fungicide chemistry allows a reduction in the number of fungicide applications whilst increasing profitability (note: reducing the number of fungicides is seen as a key measure for slowing down resistance development in cropping systems).
- Examine whether there is germplasm (varieties tested) that has sufficient early season disease resistance to replace the need for the “at sowing fungicide” and Timing 1 (T1) spray applied at GS31-32.
- To determine the cost benefit ratio of fungicide application in HRZ regions of different season lengths.
The feed winter wheats RGT Accroc, Anapurna and RGT Cesario significantly out yielded all other cultivars at all three levels of fungicide input and achieved over 10t/ha with fungicide input.
There was a significant interaction between cultivar and fungicide management with the stripe rust susceptible cultivars Trojan and Catapult giving yield responses of 1.09 and 3.58t/ha to a single flag leaf fungicide compared to less than a 1t/ha with the majority of cultivars.
Septoria tritici blotch (STB) was the principal disease in untreated crops of Scepter and Beckom, whilst stripe rust (pathotype 239 dominant with 198 pathotype also present) was the main disease in Trojan, RGT Accroc and Catapult. Other cultivars were subject to low levels of both stripe rust and STB disease pressure.
Only Trojan and Catapult gave significant yield increases to the application of more than one fungicide unit while only Trojan gave a significant yield increase to four units of fungicide (seed treatment and three foliar fungicides).
The significant interaction observed in grain yields was also apparent in the grain quality (protein, test weights and screenings) and the resulting wheat grade.
Highest return on investment with fungicide was seen in the spring wheat cultivars Trojan, Beckom and Catapult due to both higher grain yield and better grain quality.
Increasing fungicide input across seven cultivars of wheat produced significant interactions in both grain yield and quality (protein, test weight and screenings) (Tables 1 – 5). The influence of treatment on net margin, cost benefit ratios ($ earnt for $ spent) and gross margins are presented in Tables 6-8. The disease recorded in the trials was principally Septoria tritici blotch (STB), stripe rust
and leaf rust, levels of which are presented.
Sown: 20 April 2021
Harvested: 5 January 2022
Rotation position: 1st Cereal after canola 2020
Soil type and management: Red clay loam – Kelly chained over summer
Lead research organisation |
Field Applied Research (FAR) Australia |
---|---|
Host research organisation | N/A |
Trial funding source | GRDC FAR2004-002SAX |
Related program |
FAR Hyper Yielding Crops 2020-2022 |
Acknowledgments | N/A |
Other trial partners | Not specified |
Crop type | Cereal (Grain): Wheat |
---|---|
Treatment type(s) |
|
Trial type | Experimental |
Trial design | Randomised,Replicated,Blocked |
Sow rate or Target density | 180 seeds/m2 (150 plants/m2 target) |
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Sow date | 20 April 2021 |
Harvest date | 5 January 2022 |
Plot size | Not specified |
Plot replication | Not specified |
Psuedoreplication | Not specified |
Fertiliser |
Please see report for details |
Fungicide |
Please see report for treatment details |
Seed treatment | Vibrance + Goucho |
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.