29 May 2015 | Online since 2003



6 July 2012|News

Managing Verticillium wilt in oilseed rape


Verticillium wilt has become a widespread disease problem in oilseed rape, particularly in the Eastern counties, the South and Midlands, and with no proven chemical cure, the only way to manage it is through cultural control methods including the use of resistant varieties.

Dr. Peter Gladders of ADAS advises that farms with this problem need to manage it through better agronomy and resistant varieties. “The initial approach is to grow crops as well as you can. Robust plants with stronger root systems are more resilient to infection. The second string to your bow is to grow resistant varieties. Widening the rotation is not a practical option as the pathogen can survive in the soil for over ten years. Verticillium also tends to be at higher incidence on lighter land and in crops established by minimal tillage, the most common way of establishing rape nowadays.”

He suggests that growers should be inspecting their own crops now and assessing their individual risk in order to decide whether to grow resistant varieties or call in other aspects of crop management. “Symptoms are just starting to appear in the field and are seen as premature ripening and pale green/yellowing pod colour. On the stem long vertical light brown stripes run the length of the stem and then develop into long vertical grey pin stripes with black microsclerotia on the stem surface. The disease impact is premature ripening and subsequent yield loss. Although yield loss in the UK has been found to be variable, in Sweden reports of up to 50% yield loss have been seen in some years.”

ADAS trials have indicated wide variation between varieties for resistance to Verticillium wilt. Dr Gladders thinks that the genetic resistance is multigene and that certain breeders including Grainseed have the necessary breeding stock that has this resistant capacity.

Neil Groom, Technical Director of Grainseed, confirms that the company do have a strong breeding portfolio of Verticillium resistant rape varieties including Es Agatha and Es Alienor. “Screening work in the UK and France has demonstrated significant differences between rape varieties grown under the same conditions. Alienor and Agatha appear to be able to resist Verticillium very well, much better than other varieties such as Castille and Excalibur that are very badly affected by this disease. Dr. Gladders has warned that growing susceptible varieties too widely can build up the pathogen in the soil for the future.”

Both Alienor and Agatha are particularly vigorous in the autumn and can be grown together on the farm, as Alienor is early maturing and Agatha a little later, so harvest can be spread, points out Neil.

With tighter rotations, more Verticillium being seen in oilseed rape crops and the main way of minimising this disease being the use of resistant varieties, growers should seriously consider planting Alienor and Agatha this autumn, particularly as we have no proven in-field chemical treatments to fall back on, he says.

“Alienor is already a popular variety because of its very early maturity and vigour. It matures 7-10 days earlier than Castille, allowing plenty of opportunity for seedbed preparation and stale seedbeds as well as for timely entry for autumn drilled crops. Its strong Verticillium wilt resistance, confirmed by Dr Peter Gladders trials, adds another important benefit. Alienor has a 7 rating for Phoma stem canker and a 6 rating for Light Leaf Spot, giving it a combined disease resistance package that is hard to beat.“

“New this year, the conventional variety Agatha is also a strong performer, with exceptional Verticillium wilt resistance combined with high yields and oil content. In fact Agatha was one of the best Verticillium resistant varieties in trials. It yields well at 106% and has consistently outperformed DK Cabernet and Sesame in a number of trials. It also delivers a high oil content of 45.1%” points out Neil Groom.


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


10 May 2015
 Two job vacancies available possibly suit a couple or two friends on a Dairy farm. Oswestry
Two people needed to work on a modern family dairy farm both to have milking calf rearing and tractor driving experience. &nb...

1 June 2015
Farmer in  Gorebridge, Scotland  is looking for a livestock General Farm Worker
Part time regular work 2/3 days a week [and full time in busy times (lambing, sowing, silage, hay, harvest)] which will invol...

29 May 2015
Communications Professional (Advanced Trainee Potential)
We are seeking an advanced trainee/ experienced individual who is an effective Communications Professional. The main purpose...

1 July 2015
Job for Harvest Tractor Driver >>>> Bury St Edmunds<<<<
4500 ac farm business looking for an experienced hard working reliable tractor driver for the harvest period. You will be wor...

1 June 2015
Job for Herdsperson >>>> Taunton
300 high yielding Holsteins on a x2 a day milking,TMR, cubicle housed 365days on a forward thinking family farm, milking expe...



Top stories you may have missed
15 May 2015 | Arable

Scotland’s Rural Affairs Secretary Richard Lochhead is calling on the Europ...


15 May 2015 | Finance

As the country settles down following the turmoil of the general election, ...


14 May 2015 | Animal Health

New research from the Universities of Bristol and Cambridge has found that ...


13 May 2015 | Animal Health

A new publication to help farmers prevent sheep lameness and offer advice o...


12 May 2015 | Agri Safety

The Farmers’ Union of Wales is putting the spotlight on Liver fluke at next...


5 May 2015 | News

The UK is now third in the global rankings for utility-scale solar energy a...


29 April 2015 | Agri Safety

A recent Rural Watch demonstration and information event gave Farmers’ Unio...


24 April 2015 | Meat Processing

Retailers should confirm their commitments to sourcing UK lamb this season,...


15 April 2015 | Meat Processing

A leading retailer has apologised after selling imported lamb in a Borders ...


9 April 2015 | Finance

The time has come for landlords to expect to see reductions in farm rents, ...