To assess the influence of cultivar, management strategy and fungicide application and their interaction effect on grain yield

• In a variable trial there was no significant yield effect of using Septoria tritici blotch (STB) infected wheat stubble or flutriafol on the basal fertiliser over the paddock canola stubble (standard).
• There was a significant interaction between the number of fungicide units applied and variety with the STB susceptible variety Revenue giving positive increases in yield as fungicide input increased from untreated (2.58 t/ha) to 4 units of fungicide producing 5.22 t/ha.
• The response to fungicide was less than a 1 t/ha increase with RGT Cesario and Anapurna with the latter giving its optimum response to four units of fungicide whilst RGT Cesario gave optimum response to 2 units of fungicide.
• The most prevalent disease in Revenue and Accroc was STB with low levels of stripe rust in the latter.
• Lower levels of disease were experienced in Anapurna and RGT Cesario with Anapurna suffering from low to intermediate levels of STB and RGT Cesario suffering from stripe rust and very low levels of STB.

Trial design: Factorial (Variety x Management x Disease pressure)

Rotation position: 2021 Canola
Soil type: Neutral-slightly alkaline Organosol (Peat soil) – high organic matter (0-30cm)
Colwell P (ppm) 0-10cm: 65.0
pH (CaCl2) 0-10cm: 7.6
Organic Carbon (%) 0-10cm: 11.0