30 January 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


11 January 2015
Sous Chef - Live In
The Head Chef sources superb ingredients such as welsh beef, lamb and game from local suppliers as well as a variety of chees...

16 January 2015
Maintanence Manager
Our client is one of the UK's leading dairy businesses within the FMCG industry. Working with the Engineering and Production ...

14 January 2015
Distribution Driver
Privately owned, you will be working for a fully-integrated business controlling the whole product supply chain, from farms, ...

29 January 2015
Postdoctoral Research Associate
Agriculture, Food and Veterinary. You will join a University with a strong commitment to science underpinning sustainable foo...

23 January 2015
2 - 3 Environmental Managers ITT
Offshore wind farm experience would be an advantage. A Renewable Energy client is looking for 2 Or 3 Environmental Managers t...




Top stories you may have missed
12 November 2014 | Arable
GM crops 'good for farmers and the envir...

GM crops 'good for farmers and the envir...

GM crops are good for the economy and can reduce the amount of pesticides u...


6 November 2014 | Cattle
Smaller European markets drive beef expo...

Smaller European markets drive beef expo...

Demand from smaller European markets has helped drive strong growth for UK ...


6 November 2014 | Agri Safety
Lack of engineers a 'ticking time bomb' ...

Lack of engineers a 'ticking time bomb' ...

A lack of engineers, not enough people promoting the land-based industries ...


4 November 2014 | Bees and Beekeeping
Bee action plan due: Last chance for bee...

Bee action plan due: Last chance for bee...

Environment Secretary Elizabeth Truss is launching the National Pollinator ...


4 November 2014 | Arable
Experts welcome financial boost for youn...

Experts welcome financial boost for youn...

Agricultural specialists have welcomed a potential financial boost for youn...


3 November 2014 | News
Supermarket competition on prices 'risks...

Supermarket competition on prices 'risks...

As retailers continue to participate in a highly competitive race to the bo...


31 October 2014 | Arable
New Defra farm figures 'underline volati...

New Defra farm figures 'underline volati...

New farm business income data from Defra, which focus on income from March ...


30 October 2014 | Agri Safety
Agriculture remains one of UK's most dan...

Agriculture remains one of UK's most dan...

Agriculture has remained one of the industries in which workers are most li...


29 October 2014 | Finance
UK farmland prices see 'substantial grow...

UK farmland prices see 'substantial grow...

Prime arable land in the UK has seen a substantial year-on-year growth in p...


27 October 2014 | Arable
Satellites to help farmers pinpoint dise...

Satellites to help farmers pinpoint dise...

A new mobile app for farmers able to pinpoint and identify disease, pests a...