Many of the dryland and irrigated layout barley crops in the group booklet were sprayed for the spot form of net blotch which all barley varieties are susceptible to.
It’s increased in severity over the last two to three seasons.
Barley on barley results in a high risk of leaf spot and burning stubble only partly reduces the spores on the stubble.
So avoid two barley crops in a row to reduce the risk and severity.
One unwatered irrigated layout planet crop was sown into burnt barley stubble and yielded 2.9 tones per hectare without a post sowing fungicide.
Planet is more susceptible than Latrobe. Some paddocks had the spot blotch during tillering.
Treatment was with Prosaro® or Tilt ® or Stingray ® and feedback was that Prosaro was better.
You can mix them with herbicides. One farmer used the relatively expensive seed treatment Systiva® cost $15 to $22/ha depending on sowing rate.
It works well as a preventative but is an upfront cost. He said he would change to a crop spray this season.
The average dryland sowing rate was 64kg/ha with no yield trend. The two planet crops were sown at 75 and 85kg/ha on April 28 and May 1 and tillered well.
The two spring watered planet crops were sown at 60 and 75k/ha for 6.1 and 4.1t/ha hectare ( later sown May 20).
The 6.1 tones per hectare crop had high biomass and high 600heads/m2. The five unwatered irrigated Planet crops were sown between 40-85kg/ha for similar yields.
If you are planning sowing Planet early in late April/ early May and there is May establishment group feedback was to lower the Planet sowing rate to 40-60kg/ha.
We were surprised by the Oaklands dryland NVT results with the small yield difference between planet and latrobe.
In 2017 planet yielded 4.9t/ha and latrobe 4.7t/ha and both yielded 3.6t/ha in 2019.
Spartacus CL yielded 5t/ha in 2017 and 3.5t/ha in 2019. Many farmers at the meeting said they like Spartacus CL.
Barley flowers about 10 days before wheat and has better frost tolerance but has less acid soil tolerance.
● John Lacy is an independent agriculture consultant based in Finley.