Issue 4 of ‘InGRAINed’ follows the release of issue 3 last Thursday and covers fungicide activity and product choice for early fungicide timings GS30-33.  


Disease Management in wheat (2024)

Fungicide activity and product choice for early fungicide timings GS30-33

Key points

• Stripe rust is “public enemy number one” in eastern states’ susceptible varieties this season, although the disease may not be as problematic as 2023.
• Epoxiconazole (Group 3 DMI fungicide) is still very effective at giving control of this pathogen if the disease is evident late tillering – first node (GS24-GS31).
• Don’t bank on much more than 7 days curative activity following an infection event of stripe rust. Control exceeding 7 days after an infection event on a specific leaf layer will result in “scarring” becoming evident in the crop, even if stripe rust pustules are not observed.
• The GS31/32 fungicide is typically the second most important spray timing in the strategy and is essential for susceptible varieties where disease is present in the crop.
• The timing traditionally coincides with the emergence of the first of the important “money leaves”, F-2 and F-3, with F-2 being the more important.
• Where disease pressure is very high in susceptible varieties, and evident in the crop at GS31/32, consider expenditure on mixtures of DMI (Group 3 triazoles) with strobilurins (QoI Group 11) or SDHIs (group 7).
• Epoxiconazole is very strong on stripe rust but needs support from QoI Group 11 with pyraclostrobin (robust rates of Opera) or azoxystrobin for control of stripe rust and STB.
• Prothioconazole is now slightly more effective on STB than epoxiconazole depending on region, but is slightly less effective on rusts.

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