By Damian Jones, ICC
Previous trial work at the Block had shown yield improvements in barley with the application of a fungicide at Z32-33 despite little disease being observed.
Barley fungicide strategy diﬀers from wheat as unlike wheat, the leaves that drive yield are the two below the ﬂag and so fungicides are applied at the Z32-33 (around second to third node stage) to protect the ﬂag – 1 and lower leaves. This trial was sown with Commander (S to scald; MS-S to spot form of net blotch) and LaTrobe (R-VS to Scald and S-VS for SFNB) with a range of fungicide, plant growth regulator and other treatments.
The following products were used:
Fungicide Registration for disease control in Barley
The treatments were as follows:
- Control – no fungicide applied
- Prosaro – 300 ml/ha at second node (Z32)
- Prosaro – High rate at Z32, as a fungicide and potentially as a PGR
- Tebuconazole – 145 ml/ha at Z32
- Tebuconazole – High rate at Z32, as a fungicide and potentially as a PGR
- Tebuconazole – 145 ml/ha at Z32 and 145 ml/ha at Z39
High Rates – rates used are higher than label and intended to test the PGR eﬀect of the triazole fungicides.
Fungicide application dates
All Prosaro and Tebuconazole treatments at either a high rate at Z32 or repeat applications at Z32 and Z39 saw yield increases above the control in Commander. No treatment improved the yield of LaTrobe. While there was diﬀerences in screenings in Commander, these were not signiﬁcantly diﬀerent to the control.
Retention was improved in LaTrobe by some treatments that were not necessarily related to yield increases, but they were not suﬃciently large enough to have an impact on delivery standards. Fungicide treatments had no eﬀect on protein of both varieties.
What does it mean?
Knowing the varietal characteristics of your variety, in particular the disease ratings, is essential for correct management of your crop.
The stubble project – maintaining profitable farming systems in Victoria and Tasmania with retained stubble (project number BWD00024) is funded by the GRDC.
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