Late spring proves favourable for T2 disease levels

08.06.2018

Tim Boor ADAS, Plant Pathologist

Crop  growth stages are about a week back on where they were this time last year, because of the late spring.

Septoria tritici is the main threat to crops and can be found on leaf 4 in most crops and even occasionally on the tip of leaf 3; however, this does tend to be in the crops where unfavourable weather conditions delayed T1 applications.

There is some yellow rust about on susceptible varieties but at low levels. Powdery mildew is also starting to appear lower in the canopy in some fields, but this is not a cause for concern.

Most T2s were applied in the last three weeks and unlike the T1 timing the conditions are good.

The SDHIs and triazoles provide the most robust disease control. The use of multisite actives at this time is also likely to improve disease control and yield and will insure a level of control is maintained in the event of resistance development.

Susie Roques ADAS, Crop Physiologist

Last year’s Real Results Circle was the first really big series of tramline trials done using Agronōmics, a collection of spatial and statistical approaches that will help farmers draw robust and scientifically credible conclusions from their own on-farm trials. We really learnt as much about the process as about the treatments.

We learnt lessons about choice of field; where the farmers had chosen a really even large field we got far more precise results than with an odd-shaped uneven field and so we passed that message onto the farmers. We have, on average, better fields to work with this year.

When yield mapping is used we were struck with how much more interesting and useful the report we can produce and give to the farmers is, because then we are able to do statistics on the results and know how confident we can be in those results.

Some of the farmers last year had yield mapping on their combines but didn’t manage to come through with the data. They used weighbridge results which are just two numbers and you can’t do statistics with that. This year we are very hopeful that we will get a lot more yield mapping data in.

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