Foliar Fungicides for Barley

  • No fungicide treatment gave any yield benefit or extension of “green-ness” of the canopy.
  • The dry early winter and spring resulted in low disease pressure.

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 Compass (SVS to scald; MS-S to spot form of net blotch).

The following products were used:

icc 2017 bft1

Fungicide Registration for disease control in Barley

The treatments were as follows:

  1. Control – no fungicide applied
  2. Amistar Xtra                            300 ml/ha at second node (Z32) only
  3. Amistar Xtra                            300 ml/ha at second node (Z32)                                             + Tebuconazole                      145 ml/ha at Flag -1 (Z34)
  4. Tebuconazole                          145 ml/ha at Z32 only
  5. Tebuconazole                          145 ml/ha at Z32                                                                       + Tebuconazole                      145 ml/ha at Flag -1 (Z34)
  6. “Full” Tebuconazole               145 ml/ha at Z32 and 145 ml/ha at Flag-1 and 145 ml/ha                                                      at full head emergence (Z59)
  7. “Late” Tebuconazole              145 ml/ha at Z32 and 145 ml/ha at Z59

Late applications of Amistar are claimed to keep the canopy greener longer, and so the trial was scanned with a handheld Greenseeker NDVI post-flowering until the canopy had hayed off.

Growth Stage Date 
Z32 3rd August
Z34 28th August
Z59 5th September

Results

icc 2017 bt2

While all treatments had higher yields than the control, statistically these were not significant.

All grain quality testing results were not significantly different to that of the control.

Below is the summary of the NDVI measurements during grain fill and ripening. Very little difference was measured between treatments and at no stage was there any statistical difference.

icc 2017 bf2

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 season plays an important part in how severe disease is – 2017 saw dry conditions in late August through to harvest, which are not favourable for the occurrence and spread of the fungal diseases.

There was no extension of the canopy “greenness” from any of the fungicide strategies or products.

 

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About BCG

Birchip Cropping Group Inc. (BCG) is a not-for-profit agricultural research and extension organisation led by farmers in the Victorian Wimmera and Mallee.
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