The benefit of tackling take-all has been highlighted by a seed-treatment trial.
The soil-borne pathogen Gaeumannomyces tritici is ever present in UK arable soils – building to yield-robbing proportions when a second, third or even fourth cereal is grown.
At its most damaging on light, sandy soils, take-all can cause yield losses of up to 50% in winter wheat, with crops increasingly affected as the UK climate warms.
Financial return
This increases the need for protection against the disease where there is risk – and research conducted last year by ADAS reinforces this argument, says Certis Belchim seed treatment specialist Adam Nears.
The fully replicated trial was carried out by ADAS plant pathologist Chloe Morgan. It tested four different winter wheat varieties, each treated with a single purpose dressing (SPD), or SPD plus Latitude (silthiofam) seed treatment.
Results showed selecting the right variety can reduce the impact of take-all on the crop, with plant assessments in the SPD-only treatments showing less severe root damage on Palladium than Extase, for example.
At harvest, yield results showed a clear benefit from Latitude – the only fungicide approved for the control of take-all – in all four varieties. Extase produced 1.9t/ha extra with Latitude, Palladium 0.9t/ha, and the average response across all trial varieties was 1.4t/ha.
Financial return
“Our Latitude Cost Benefit Calculator assumes a more modest 0.55t/ha response, taken as a medium risk average from many years’ of trials.
“With treatment costing about £230/t, harvest 2024 wheat futures at £200/t, and assuming a seed rate of 250kg/ha drilled in mid-October, the online tool shows that just 0.28t/ha is needed to cover treatment cost, delivering a respectable margin of £53.75.”
Miss Morgan is running a similar trial in 2023 and after first visual assessments in plots, take-all symptoms are not as obvious this year.
She suspects this is down to infected plants having easier access to water and nutrients, unlike last year when drought exacerbated symptoms, resulting in stunted plants, bleached ears known as “white heads” and early senescence.
Take-all building
“It doesn’t mean take-all isn’t there and it will be building on roots, so we may see signs during later observations in late June or early July.
“The data from last year’s trial showed that where planting second and consecutive wheats, the use of Latitude seed treatment is a useful risk management strategy to protect against yield loss.”
