02 April 2015 | Online since 2003



2 April 2014|Arable,Cereal,Crops,News

Severe disease pressure sees more emphasis on fungicides


Bill Barr and farmer Giles Benson

Independent agronomist Bill Barr of Prime Agriculture says that the high levels of yellow rust and septoria infecting wheat crops will mean that early fungicide sprays will need to be more robust than usual.

For one of Mr Barr’s clients, farm manager Giles Benson of Turney’s Farming in Quinton, Northamptonshire, this has meant that a T minus 1 spray (T-1), has already been applied on his rust susceptible wheat varieties.

“Robigus, Viscount and Solstice received the early fungicide treatment but the more resistant varieties such as Crusoe did not warrant it and will get their first spray at growth stage 30, T0.”

“The T-1 applied at the end of February consisted of a reduced rate of triazole and is really just used to dampen down the rust early”, he says.

For those crops that did not get the T-1 spray, the T0 will be a standard low dose triazole plus chlorothalonil spray with or without a mildewicide. Where an early spray was planned but has not been applied, a strobilurin will be added into the triazole plus chlorothalonil mix to boost rust control.

Mr Benson sees the T-1 approach as one of risk management. “It buys time and takes the pressure off the T0 spray. Cost wise it does not add too much more onto the overall programme at around the £5/ha mark so it’s well worth it for the peace of mind.”

For Mr Barr the T1 spray is still not defined as he prefers to wait and see how the crops and season progress. “We now have much more chemistry choice at T1; as well as the standard triazoles there are the SDHI’s to consider and we still have the option of strobilurins.”

“This year Mr Barr will up his spend at T1 to reflect the early threat from disease. “The T1 is protecting the upper leaves, and I don’t want to be chasing disease all season, so its critical to get it right and it needs an appropriate spend, I would be looking at around the £30 to 40/ha mark.”

Mr Barr adds that this higher cost earlier in the programme reflects a shift in emphasis between the T1 and T2 sprays to a more balanced spend; traditionally the T2 flag leaf spray has been the main emphasis of the fungicide spray programme reflected in the total spend at T2 in relation to the remainder of the programme at around 50%.

For the last five years Mr Barr has used Tracker + chlorothalonil at T1 with very good results as the boscalid plus epoxiconazole mix is very effective on septoria and rusts, and importantly at this timing, boscalid remains the most effective active on eyespot.

Mr Barr will consider the newer SDHI chemistry at T1 on disease susceptible or fungicide responsive varieties, however he will use newer SDHI’s across the board at T2, where there is a better yield response.

Nick Myers, Head of Crop Production at ProCam UK Ltd, will consider using an SDHI at T1 this year as disease pressure is potentially very high. “It is important to ‘frontload’ the fungicide programme to minimise the risk from rusts and septoria from the outset. Adexar plus a multi-site inhibitor will be an option where disease pressure is particularly high.”

“Crops generally have good yield potential this year and will justify the investment in the best fungicide technology.”

Mr Myers also sees a place for strobilurins at T1, particularly this spring where plants have been waterlogged.” Whilst the potential of crops above the ground looks good, some roots could be suffering from prolonged waterlogging and in later sown crops that may be struggling, strobs can have a good effect at T1 in both promoting and retaining green leaf area.”

“It’s important not to underestimate the physiological benefits of strobs in times of stress, and they are certainly proven to add persistence to triazoles for rust control.”

BASF cereal fungicide manager Jonathan Ball adds that recent HGCA trials show the value of pyraclostrobin (as in Comet 200) to rust control hence the company’s recommendation for the addition of 0.4l/ha of Comet 200 to 1l/ha of Tracker and CTL in high rust threat situations at T1, and if necessary at T2 to 1.25l/ha Adexar + CTL to further boost rust control.

Download



Comments


No comments posted yet. Be the first to post a comment

To post comment without approval login or register

Display name

Please enter your name

Email (optional)
Comment

Please enter your comment

Post Comment

Your comment submitted successfully.Please wait for admin approval.

Some error on your process.Please try one more time.



Jobs


21 March 2015
National Account Executive
From the farm to the factory to the retail shelf, we are all committed to delivering outstanding food experiences every time....

14 March 2015
Apprentice Administrator
Food and Drink, Manufacturing, Agriculture (Livestock), Customer Service, Retail, Business Administration, Leadership & M...

18 March 2015
Poultry Manager
Contact Andrew on mossymilton@yahoo.co.uk or send your CV to Manor Farm, Staunton on Arrow, Leominster, HR6 9LE Please refer ...

20 March 2015
Clinical Research Fellow
It comprises Barnet Hospital, Chase Farm Hospital, the Royal Free Hospital and more than 30 services in the community....

20 March 2015
Client Support Person
Landmark Systems is a company committed to providing computerised solutions for businesses including farms, private estates, ...




Top stories you may have missed
23 March 2015 | Cattle

UK butchers face difficulties to recruit...

Butchers in the UK are losing a generation through lack of training opportu...


20 March 2015 | Arable

Dust - the secret fertiliser?

NASA research has revealed how dust blown from the Sahara desert helps supp...


19 March 2015 | Arable

The Budget 2015: A Farmer's Budget?

“In the run up to the Budget 2015 most commentators were predicting that th...


17 March 2015 | News

UK's first floating solar power system l...

The UK’s first fully operational floating solar panel system has been unvei...


13 March 2015 | Animal Health

Labour and Conservatives clash over badg...

Axing the badger cull in England and Wales will save more than £120 million...


12 March 2015 | News

Solar could be cheapest energy source by...

By 2025, solar power could become one of the cheapest forms of energy in ma...


11 March 2015 | Finance

English buyers turn their attention to S...

Demand for Scottish farm land remains strong and continues to be better val...


9 March 2015 | Cattle

2020 vision for the Welsh red meat indus...

The Welsh red meat industry should aim to increase sales by at least 34 per...


6 March 2015 | News

MP raises egg industry concerns on trans...

Fears about the impact that a proposed transatlantic trade agreement could ...


Stay safe and legal when flying drones

The use of Unmanned Aerial Vehicles and Unmanned Aircraft Systems - or dron...