- 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:
The treatments were as follows:
- Control – no fungicide applied
- Amistar Xtra 300 ml/ha at second node (Z32) only
- Amistar Xtra 300 ml/ha at second node (Z32) + Tebuconazole 145 ml/ha at Flag -1 (Z34)
- Tebuconazole 145 ml/ha at Z32 only
- Tebuconazole 145 ml/ha at Z32 + Tebuconazole 145 ml/ha at Flag -1 (Z34)
- “Full” Tebuconazole 145 ml/ha at Z32 and 145 ml/ha at Flag-1 and 145 ml/ha at full head emergence (Z59)
- “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.
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.
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.