Growers advised to increase spray diversity this spring
G
rowers and agronomists are being urged to in- crease the diversity of
their spring spray programmes by including folpet as an alterna- tive mode of action. With mounting resistance
making the effective control of wheat and barley diseases in- creasingly diffi cult to achieve, a multi-site fungicide must be included in crop protection pro- grammes, says David Roberts, technical specialist for Adama UK.
“In recent years, the effi cacy of some of the principal wheat and barley single-site fungicides have been eroded by mounting disease resistance. Meanwhile, other ac- tive ingredients have been lost to continuing regulatory restric- tions.”
Think carefully
Growers must therefore think carefully about how they struc- ture their spring fungicide pro- grammes, says Mr Roberts. Doing so will help to prolong the effec- tive lifetime of at-risk single-site products – as well as ensuring crops are adequately protected. Whilst the azole group of fun- gicides remains relatively stable against rhynchosporium and net blotch, their effi cacy against ram- ularia has diminished in recent
years – with fi eld resistance to prothioconazole reported in the UK for the fi rst time in 2017. A similar pattern appears when assessing the performance of SDHIs. As a group they remain largely stable against rhynchos- porium, but there are warning signs that they are less effec- tive against diseases such as net blotch.
Good protection Folpet continues to provide good levels of protection thanks to its ability to affect multiple sites within a pathogen, says Mr Rob- erts. “The recommended course of action is therefore to keep ahead of diseases by implementing an integrated disease management strategy.”
This means selecting disease resistant varieties, and using cultural methods and rotational changes to prevent the spread of disease. It also means using a di- versity of fungicide modes of ac- tion, including a multi-site, to pro- vide robust protection.
Mr Roberts endorses the use
of folpet in the tank mix at T0 to protect against septoria in wheat and again at T1 – or at the later T1.5 and T2 timings should the need arise – when it will aid green leaf retention and increase the po- tential for improved yields.
Take control of crop yields...
...with a spring application of YaraMila ACTYVA S
™
• Increase wheat yields by up to 0.5 t/ha*
• Increase oilseed yields by up to 0.67 t/ha*
*based on the results of 2016 trial data
The perfect ratio of nutrients, readily available, for when your crop needs them most
@Yara_UK Yara UK
Folpet can help protect crops against yellow rust (pictured), rhynchosporium and ramularia.
JANUARY 2020 • MIDLAND FARMER 23
agronomy.uk@
yara.com www
www.yara.co.uk
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