06 March 2015 | Online since 2003



1 July 2014|Arable

The way forward for Verticillium


As there are no adequate chemical solutions, growers will have to rely on good agronomy combined with resistant varieties in order to control Verticillium wilt in oilseed rape.

Dr Faye Ritchie of ADAS says “The only way forward, particularly in areas of high risk, is to establish a strong crop that can withstand disease better through good agronomy and to choose a variety that has proven resistance to the disease. No individual genes resistant to Verticillium wilt have been identified as yet, so resistance is thought to be multigene.”

She reports that high risk areas for Verticillium are the Eastern counties, the South East and Midlands, although it has been identified on farms in other counties as far north as Yorkshire. “It is widespread across many areas of Europe, where yield loss of up to 50% has been reported in severe cases. In the 2013 DEFRA oilseed rape disease survey, 24% of crops surveyed in England and Wales had Verticillium wilt symptoms before harvest, compared with 10% in 2012 and 18% in 2011. A recent HGCA study reported severely affected plants showed decreases in thousand seed weight of up to a quarter, highlighting potential yield losses through premature ripening. This is significant as, in some severely affected crops, over 90% of plants were reported to have symptoms of Verticillium wilt prior to harvest last year.”

“It is difficult to identify Verticillium wilt at the moment. It may well be there, but we can’t see it. However, growers can look for symptoms in crops prior to harvest, to gauge the level of risk for future crops. Early symptoms to look for include vertical yellow or brown stripes up the stem and along branches. The classic signs are microsclerotia on the surface of stems close to desiccation time. Microsclerotia can survive in the soil for over 10 years, making crop rotation less effective,” says Dr. Ritchie.

Although not part of the HGCA Recommended List criteria, resistance to Verticillum wilt has been identified in some varieties and there are significant differences between them, with varieties such as Catana, Es Alienor and Es Cubic being resistant, whereas Castille and Excalibur were susceptible.

Grainseed have a particularly strong breeding portfolio of Verticillium resistant oilseed rape varieties including Es Alienor, Es Alegria and Es Cubic. “In ADAS and the AICC trials, Alienor and Alegria show excellent resistance to this damaging disease. Cubic showed the same high level of resistance as Catana, which is regarded as the control variety,” reports Neil Groom, Technical Director for Grainseeds.

“Growers should grow oilseed rape varieties with a good overall disease resistance package, because where Light Leaf spot and Phoma are both obvious, Verticillium symptoms are more severely expressed. Also Phoma is still the major disease threat to UK crops. Alienor has a 7 rating for Phoma stem canker and a 6 rating for Light Leaf Spot, giving it an excellent combined disease resistance package. Alegria and Cubic also have a 7 rating for Phoma and a 5 for Light Leaf Spot. Genetic resistance to Phoma and Verticillium in these varieties is multi-gene and so unlikely to break down.”

“This year we have no neonicotinoid seed dressings to protect crops as they come through and so many growers will be opting to grow varieties with known autumn vigour anyway. Alienor, Alegria and Cubic all have proven Verticillium resistance, high Phoma resistance plus excellent autumn vigour – the best combination for protecting yield, reducing growing costs and increasing flexibility of your spray programmes,” points out Neil.

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


25 February 2015
Corporate Tax Assistant Manager, Cambridge
Clients are mainly UK entities, although some have an international reach too and span a number of different industry sectors...

25 February 2015
Property Paralegal
The Rural Property team deals with a diverse range of matters including options and leases for renewable energy, complex plan...

3 March 2015
PA/Office Co-ordinator
A wonderful prospect to work as a PA/Office Co-ordinator has arisen giving the ideal candidate the scope to thrive! If you wi...

20 February 2015
Cleaner
Cleaner required for busy pub/resturaunt, Working five to six days per week from 09:30 to 12:00, previous experience is essen...

18 February 2015
Agriculture, Rural Business & Estates Solicitor
Agriculture, Rural Business & Estates Solicitor Leading Sussex firm has an exciting opportunity for a Solicitor to join t...



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...