01 March 2015 | Online since 2003



20 May 2014|Arable,Cereal,Crops,News

Yellow rust threat remains 'extremely high'


With the unsettled weather of late disease pressure from Septoria tritici and yellow rust remains extremely high, and spray intervals and dose rates will need to be closely monitored heading toward the impending flag leaf spray warns Bill Clark of NIAB TAG.

“Whilst normally septoria would be more of an issue in the north and west, and rust in the east, this year we are seeing high levels of yellow rust across most areas,” he says.

“However in the east where the rust is particularly aggressive, keeping on top of it is as important as getting on top of the septoria; Warrior races are rampant where no T0 was applied and will be moving up the crop quicker than sprays can control.”

“There are very few issues with mildew, so it really is a two horse race with a real focus on septoria and rusts for the T2 spray “he says.

Crops are at different stages of flag leaf emergence from just emerging to fully emerged with boots splitting, and it will be managing the interval between the T1 and T2 that will be critical. “Timing is all about how long leaf 2 has been out – if more than 10 days then the flag leaf spray has to go on – even if not all the flag leaves are out as it will be necessary to go on again as soon as the ears are out.”

However Mr Clark is keen to point out that dose rate of fungicides at T2 will be equally important. “Consider the rate of the SDHI first as that will determine the rate of control. Triazoles are of course important and in high risk situations - the days of using half doses are long gone - high risk crops need three quarters of a dose of a good triazole.”

Bill Barr, independent agronomist with Prime Agriculture based in Bedford, has recommended fairly robust fungicide programmes so far this season with tight intervals, and these are working well. “The top three leaves are clean, with any signs of yellow rust or septoria confined to the tip of leaf 4 and below. Any spray misses are very obvious!

“The key thing at the moment is keeping the interval between T1 and T2 to three or three and a half weeks – this is really important. If you get to over three weeks, then I would agree with Mr Clark and advise getting the T2 on even if the flag leaf is not fully emerged.”

“SDHI at T2 is essential and don’t skimp on the rate. If weather conditions mean that spraying is delayed until nearer four weeks, then it may be necessary to add in more triazole for a bit more eradicant activity.”

Mr Barr suggests that if the flag leaf is only half emerged, there may be a benefit of adding chlorothalonil to the SDHI if it is Adexar, but not to Aviator. “Then if rust is re-appearing and the planned flag leaf fungicide is Aviator, add in a strobilurin such as Comet 200.”

Steve Dennis of BASF adds that the kick back activity of Adexar will prove to be really useful where timings are delayed as we move towards the flag leaf spray.” You get much more curativity, more longevity of activity and better disease control with Adexar than we ever had with epoxiconazole.”

Mr Dennis suggests that where possible adding 1l/ha CTL to Adexar offering not only a more robust treatment but as a means of resistance management.

“It’s also worth noting that whilst Adexar is at the top of its game for yellow rust and septoria, it also provides good control of brown rust that could creep in towards the end of the season, and if disease levels are expected to be high, adding in some Comet 200 at T2 will bring additional benefits.”

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


28 February 2015
Sous Chef – All Day Dining Brasserie – Work direct with Farmers & Grow
This role would suit a Sous Chef passionate about Free Range, Organic, Seasonal, Farm to Fork, Market Fresh food....

11 February 2015
Nightshift General Dairy Operative
Passion for the dairy industry. “Medina Dairy - a successful and progressive, family-run, business. Medina Dairy operates acr...

11 February 2015
Chef
For example, nut, dairy or wheat allergies. We currently have an excellent opportunity for a Chef to join our busy team....

9 February 2015
Graduate Supply Chain Analyst - FMCG Sector
Our client is part of a European food manufacturing group which specialises in dairy products for all major retailers as well...

19 February 2015
Citrix Consultant- Xenapp
Responsible for providing support of multiple Citrix Presentation Server Farms hosting productivity and line of business appl...




Top stories you may have missed
2 February 2015 | Arable
Is EU membership damaging UK farming?

Is EU membership damaging UK farming?

Membership of the EU is damaging the British farming industry, according to...


29 January 2015 | Machinery and Equipment
Drones 'rapidly changing' agriculture

Drones 'rapidly changing' agriculture

BASIS has launched an accreditation for pilots of Unmanned Aerial Systems (...


23 January 2015 | Arable
UK wheat yields have potential to double

UK wheat yields have potential to double

UK wheat yields have theoretical potential to more than double over the nex...


23 January 2015 | Machinery and Equipment
Crowds flock to LAMMA 2015

Crowds flock to LAMMA 2015

Britain’s farmers flocked to Peterborough for the first day of LAMMA’15 to ...


22 January 2015 | Cattle
Don't blame supermarkets for milk crisis...

Don't blame supermarkets for milk crisis...

The crisis in the dairy industry is not the fault of supermarkets, accordin...


16 January 2015 | CLA
Families affected by HS2 face 'major wor...

Families affected by HS2 face 'major wor...

Transport Minister Baroness Kramer visited three rural businesses in Cheshi...


16 January 2015 | Machinery and Equipment
John Deere unveil new 6R tractor range

John Deere unveil new 6R tractor range

Spearheading the John Deere range of mid-size tractors from Mannheim, the n...


14 January 2015 | Animal Health
Monthly TB checks more effective than ba...

Monthly TB checks more effective than ba...

Regular testing for bovine TB could significantly reduce the number of infe...


12 January 2015 | News
Government regulations hampering UK agri...

Government regulations hampering UK agri...

Single-issue policy-making threatens to hamper, not help, the progress of U...


8 January 2015 | Cattle
2015: The year ahead for the beef market

2015: The year ahead for the beef market

2014 has been a “rocky old year” for the beef industry but better prices ar...