13 February 2016 | Online since 2003

Alegria in top three for Verticillium wilt resistance



17 July 2014 11:05:13|News

Alegria in top three for Verticillium wilt resistance


In trials the oilseed rape variety Alegria from Grainseed was number 3 out of 30 varieties in terms of Verticillium Index and, with its other benefits of good overall disease resistance and excellent vigour, it could be a useful variety for growers to consider.
Colin Button, Seed Manager for national distributor Hutchinsons, has been conducting Verticillium trials for 4 years and explains the background to this unique project. “In 2010 one of our agronomists in Lincolnshire had a crop of oilseed rape that unexpectedly collapsed at harvest. It was difficult to understand why, so we brought in a plant pathologist from ADAS who diagnosed Verticillium wilt at very high levels. It was the first time we had seen this disease at such devastating levels and we have subsequently used this site for trials to assess Verticillium resistance. This year, 2014, the trials are hosted by ADAS Boxworth. Initially oilseed rape breeders were a little reluctant to submit their varieties for evaluation, because they had not observed discernable differences in resistance up to that time, but now we have most of the major breeders submitting varieties as they see the disease spreading. The trials set out to establish usable differences between varieties using a Verticillium wilt Index, which indicates disease expression in the crop. The lower the Index, the better. This information is useful to direct growers in the future, if this disease gets progressively more widespread.”
In the 2013 trials, the rape variety Alegria had a Verticillium Index of 29.9, compared with Catana, which is the reference variety for Verticillium resistance, which had an Index of 28.5. Alegria was the third lowest scoring variety, showing it has natural tolerance to this disease. Alienor, also from Grainseed, was 7th out of the 30 varieties tested with an Index of 44.8. The worst variety had a Verticillium Index of 83 and Excalibur, the reference variety for susceptibility to this disease, was 77.1.
“We have seen Alegria in trials for two years now. It is one of a group of new varieties that has good standing power, early maturity and good overall disease control, including Verticillium, which is what growers are looking for,” says Colin.
According to the HGCA Crop Monitor, 24% of winter oilseed rape crops were infected with Verticillium wilt in 2013. In 2012 it was 10% and in 2011 18%. It is found in all regions except the South West. Highest levels of disease were in the South East where 58% of crops had infection and 8% of stems affected.
Colin Button reminds growers that Verticillium wilt symptoms can only be seen at the end of the crops’ life, so it is worth going out to inspect crops prior to harvest, (and look at the post - harvest stubbles) which is any time now, to look for premature ripening of stems or smaller branches. “If there is high inoculum, dry and warm soils and a susceptible variety, there could be an outbreak of Verticillium at any time. So if you know you have high disease pressure, use a variety with proven resistance.”
Neil Groom, Technical Director for Grainseed advises growers to consider growing rape varieties with a good combined disease resistance package. “And this means good known resistance to Verticillium and Phoma as well as to Light Leaf spot. Alienor has a 7 rating for Phoma stem canker and a 6 rating for Light Leaf Spot, giving it an excellent overall disease resistance package. Alegria has 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.”
“Experts are advising growers that Verticillium is best managed through growing resistant varieties and through better agronomy. They also warn that growing susceptible varieties in disease-affected area could lead to a build-up of microsclerotia in the soil. Alienor and Alegria show good resistance to Verticillium as well as exceptional vigour which will help them grow away from diseases and pests, even more important this year with no neonicotinoid seed treatments,” says Neil.

Download





0 Comment


Name

Please enter your name


Email

Comment

Please enter your comment


Post Comment

Your comment submitted successfully.Please wait for admin approval.


Comments

No comments posted yet. Be the first to post a comment

World News

Greece | 12 February 2016
Government braces for farmers' descent on Athens

Hundreds of farmers from various parts of Greece are expected to descend on Athens on Friday to protest against planned increases to their tax and social security contributions but the government hope...


United Kingdom | 12 February 2016
Payments row Scottish government minister faces farmers

Scottish government rural affairs secretary Richard Lochhead is expected to face tough questions about payments to farmers later. The minister is due to address the NFU Scotland annual general meet...


Canada | 12 February 2016
Cage-free eggs have drawbacks says farm animal welfare expert

The push for cage-free eggs by fast food companies is not necessarily the best option, according to a farm animal welfare expert at the Atlantic Veterinary College. Michael Cockram at UPEI's Sir J...


France | 12 February 2016
France's Hollande says to cut farmers' payroll taxes

French President Francois Hollande said on Thursday that the government would reduce payroll taxes to help struggling farmers. Prime Minister Manuel Valls "will announce before February 17 a new de...


New Zealand | 12 February 2016
Sheep farmers look for answers to slow the decline

Sheep farmers can't seem to catch a break at the moment. Pat Deavoll delves deep into why sheep numbers have declined. The message is clear; the demise of sheep farming in South Canterbury reflects...



Trending Now

Viewed
Discussed

Farms and Land for sale


Holiday Rentals search



Top stories you may have missed
Username
Password