22 April 2015 | Online since 2003



Look out for Sclerotinia Outlook


Well-advanced oilseed rape crops plus warm temperatures and lengthening days come together to bring forward the risk of Sclerotinia, according to the BASF/ADAS Sclerotinia Monitoring Service, which started this week. The monitoring service reports that the mild but wet weather is expected to promote early activity of sclerotia, with some germination already seen at the Devon site.

This is in contrast to last year when the first germination wasn’t seen until the start of April at the Exeter depot, says ADAS plant pathologist Dr. Caroline Young. She goes on to warn growers that there are very forward crops of oilseed rape this year, with flowering already visible in many fields and some southern crops already into the start of stem extension following warmer temperatures and lengthening days. “We expect that for most crops, sclerotial germination will start ahead of flowering or coincide with the start of flowering this year.”

"The Sclerotinia monitoring information is generated from six sites nationally - Cambridgeshire, Yorkshire, Herefordshire, Lincolnshire, Kent and Devon. The data gathered is used to generate a local risk assessment based on local climatic conditions," she explains.

“Last year, as a result of over 10 years’ worth of Sclerotinia monitoring experience gained by ADAS and BASF, the monitoring service expanded to include this postcode-based outlook. By using this free service on the totaloilseedcare website, growers and advisors can gauge just how the Sclerotinia risk is shaping up for the season on a local basis 24/7. Feedback on this new local development, Sclerotinia Outlook, has been very positive," says Jonathan Ball of BASF.

The service provides a colour-coded outlook (green for least likely and red for most likely) and regional guidance based on the likelihood of sclerotial germination in a particular postcode area.

Caroline Young of ADAS believes that the service will be very useful this year as Sclerotinia infection risk is likely to be moderate to high at early flowering. “As a priority growers should be prepared to make spray applications at early to mid-flower stage. Oilseed rape flowering is early this year, beginning now in the South West and South East. Sclerotinia, too, will be early.”

Caroline reminds growers that a soil temperature of 10°C is needed for sclerotia to germinate actively. “Rape crops are at highest risk when sclerotial germination synchronises with early flowering. Spores infect the plant when minimum temperatures are above 7°C and there are long periods of high humidity. You need to apply fungicide treatments before infection and this is where the Outlook service will be most useful. By using the Outlook service, it can help to prioritise spraying demands over the next few weeks.”

Sclerotinia is an important disease of oilseed rape, causing yield losses of 30 to 50% in severely affected crops. It is therefore important to protect crops at risk. BASF's Jonathan Ball adds that, “fungicides are mainly protectant so it is important to know when disease is likely to come into the crop. Knowing this information puts you in a better position to time fungicide applications correctly, in advance of disease and before any significant petal fall. BASF advise growers to start their programme with an early Sunorg Pro on the many vigorous crops and use an early to mid-flower fungicide treatment of Filan (boscalid) at 0.3-0.5 kg/ha before petal fall.”

Both Filan and prothioconazole-based fungicides give excellent control of Sclerotinia, but a number of other important considerations make Filan the product of choice for 2014:

- Yield increase in the absence of disease demonstrated by the HGCA trial summary 2010-2012. Filan produced 0.25 t/ha (£70/ha) over untreated crops
- A different mode of action for resistance management of Light Leaf Spot – triazole resistant strains of Light Leaf Spot exist. Since spores will still be present in the crop, FRAG guidelines say avoid the same actives used earlier against Light Leaf Spot when targeting Sclerotinia at flowering.
- Bee-safe – can be mixed with pyrethroids for seed weevil control at flowering. However, as with all sprays, ensure that bees are not foraging actively in the crop at the time of spraying.

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


8 April 2015
Landscaping Apprentice
Berkshire College of Agriculture. AMB Landscapes Ltd are a small Landscaping company looking for a permanent employee to join...

10 April 2015
Product and Technical Manager
Working from home and reporting to the UK head of technical, the role carries accountability for increasing on farm competenc...

13 April 2015
Senior Infrastructure Analyst, Central Leeds
The companies applications sit on SQL databases and it is preferred that you have experience of SQL and be confident with clu...

3 April 2015
Licensing Product Manager
It is the home of our hit Farm Heroes Saga with more hit games in the pipe! We are looking for a Licensing Product Manager to...

20 April 2015
Team Leader – Global Forests and Sustainable Land Use Programme
A Bachelor’s degree in social sciences, business, finance, politics, agriculture, forestry, environmental management or other...



Top stories you may have missed
10 April 2015 | Agri Safety

Final phase of Scotland's war on BVD

The permanent eradication of Bovine Viral Diarrhoea [BVD] in Scottish cattl...


10 April 2015 | Dairy

Dairy farmers competitiveness will be te...

The abolition of milk quotas in Europe on 1st April has resulted in a numbe...


10 April 2015 | Cattle

EU milk sector growth 'dependent on expo...

The top 14 milk producing countries in Europe will increase their productio...


10 April 2015 | News

Could the rural vote hold the key to the...

Matt Ware is the NFU's head of government and parliamentary affairs, based ...


10 April 2015 | Arable

Action needed to boost farmgate prices i...

There is a 'desperate need' to improve farmgate returns given low incomes a...


9 April 2015 | Arable

OSR damage risks early Sclerotinia infec...

Rapid stem extension, after a slow start to spring, is likely to create spl...


9 April 2015 | Finance

Time for a farm rent revolution?

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


8 April 2015 | Cattle

Cogent strengthens reputation for high c...

Cogent’s reputation as a source of the highest calibre sires has been enhan...


8 April 2015 | Arable

Exotic plant fungus a 'serious threat to...

The spread of exotic and aggressive strains of a plant fungus is presenting...


7 April 2015 | Animal Health

Share information to tackle food fraud, ...

The FSA’s new Food Crime Unit wants the industry to share information, some...