06 July 2015 | Online since 2003

The way forward for Verticillium



1 July 2014 16:49:10|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


Start Date: 6 July 2015
M487: Junior Grain Trader / Commodity Trader - East

De Lacy Executive are working with our client, a leading UK commodity business, to find a talented Junior Grain Trader, or Tr...


Start Date: 6 July 2015
C179: Experienced Poultry Nutritionist

Experienced Poultry Nutritionist An first class opportunity for an experienced Poultry Nutritionist has arisen with a key int...


Start Date: 1 July 2015
Job for Dairy Assistant with tractor skills...>>>> Near Birmingham

Family farm milking 180 cows twice per day through a modern parlour need an assistant to help with all aspects of the farm. Y...


Start Date: 6 July 2015
A420: UK Sales Manager - Dairy Sector

A first class opportunity has arisen for a dynamic, enthusiastic and highly motivated UK Sales Manager to join a leading prov...


Start Date: 18 June 2015
English speaking Harvest tractor driver Job

Family farm and contracting business needs help harvesting 3500 acres over 8 farms. Driving a John Deere you will be car...





Top stories you may have missed
5 June 2015 | Cattle

A strong pound and increased red meat imports coupled with a plentiful dome...


5 June 2015 | Arable

Depression is affecting Wales' farming industry and there is a need to use ...


5 June 2015 | Arable

With just one week to go before the final judging and announcement of the w...


5 June 2015 | Finance

A rural law expert has highlighted the importance of good succession planni...


5 June 2015 | Farmshops

A south Yorkshire dairy farming family is pulling out all the stops to prom...


4 June 2015 | Finance

Predicting what is going to happen to wheat prices is a challenge, but in s...


4 June 2015 | Agri Safety

A Lancashire based livestock theft prevention scheme is aiming to go nation...


4 June 2015 | News

A female farmer has been recognised by the farming and conservation industr...


4 June 2015 | Finance

The new Conservative government appears to be preparing to implement cuts f...


4 June 2015 | Arable

The Rural Payments Agency (RPA) will have mobile support units at the follo...