11 February 2016 | Online since 2003

Red alert for brassica pests and disease



28 July 2010 13:47:22|Produce,Crops,News

Red alert for brassica pests and disease


Brassica growers are facing high risks of pest and disease pressure this season. The Brassica Alert disease and pest forecasting system for brassica crop growers has already hit red warning high risk for the key diseases Alternaria, Ringspot and White Blister by mid-July, along with high risk for Silver Y and thrips.
The latest report (23 July 2010) - above - shows weather conditions have remained highly favourable to White Blister at every one of the monitored sites across Lincolnshire. The risk of Alternaria and Ringspot risk has eased, but Brassica Alert will continue to monitor the sites for disease spores of both diseases in the air which, combined with weather forecasts, will trigger the traffic-light style warning of disease risk.
With the current conditions White Blister will require treatment with an appropriate fungicide, such as Folio Gold, as soon as symptoms are seen, advises Andy Richardson of the Allium & Brassica Centre (above), which produces the Brassica Alert forecasts. "When the system triggers a high risk for Ringspot (below) and Alternaria, any crops that have not received a fungicide in the past 14 days must be treated as a priority."

For initial Ringspot or Alternaria control, Amistar Top combines a high level of triazole activity with difenoconazole, to target any infection already in the crop, along with the strobilurin protectant of azoxystrobin to prevent infection of clean green leaf. Where growers are seeking to hold strobilurin use for later in the season, they may opt for straight Plover (difenoconazole) for the early applications.

Mr Richardson reports that a high level of disease risk across the whole region early in the season will require growers take action now, to minimise the risk that diseases will continue to develop as the autumn progresses. "We have removed the ’amber’ medium risk warning for diseases on Brassica Alert, which high lights the issue that, if there is disease risk present, growers need to be taking mitigating action," he advises.
Compounding the high White Blister disease risk, key brassica pests, thrips and Silver Y Moth, have also been identified at red high risk numbers on every one of the monitoring sites, with Diamond Back Moth at the amber moderate risk level. That means over 150 thrips and 20 Silver Y Moths have been caught in each of the traps, along with 10-20 Diamond Back Moths.
Jon Ogborn of Syngenta urges growers to start insecticide strategies early, to prevent damage and any further check in crops already behind with the dry weather. "The Brassica Alert warnings are a timely indication to look out for the first signs of caterpillar damage," he warns. "Hallmark Zeon applications targeted for Silver Y Moth have proven extremely effective, and will control Diamond Back Moth caterpillars too." Hallmark Zeon treatment for caterpillars may also help suppress thrip numbers, which are of particular concern for storage cabbage producers.
Brassica Alert is sponsored by Syngenta and available free to all growers and agronomists, providing valuable guidance on local risks and helping to tailor application timing more accurately. Growers can receive warnings, based on traffic-light system of green, amber or red, from the website and can get high risk warning SMS text messages direct to their mobile phone.
Growers and agronomists covering a large area can opt to receive information from any number of sites across the region. Maintaining a record of risk levels can also help with justification of pest and disease treatments. To sign up free go to: http://www.syngenta-crop.co.uk/brassica-alert.aspx
Andy Richardson adds that, with better tailoring of fungicide programme timings, the system has proven extremely effective over the past four seasons. It has, on average, enabled growers to deliver higher yields of marketable produce using fewer treatments over the course of the season.

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

India | 10 February 2016
Smallest Indian wheat crop in six years to spur imports

India may harvest its smallest wheat crop in six years after two successive years of below-average monsoon rainfall stresses crops, potentially opening its doors to more imports. Production is set ...


Ireland | 10 February 2016
Another volatile year ahead for farmers

Northern Ireland's agri-food sector was another volatile year ahead, Danske Bank has said. The institution held its annual Agri Economic Outlook Breakfast yesterday and heard about "multiple threat...


USA | 10 February 2016
California farmers reap record sales in record drought

A new state report shows California farmers reaping record sales despite the epic drought, thriving even as city-dwellers have been forced to conserve water, household wells have run dry and fish have...


Ireland | 10 February 2016
Dairy farmers: Don't use the milk price as an excuse to compromise on herd welfare

Spring calving season is now in full flight on the majority of dairy farms. In excess of one million calves will be born on Irish dairy farms between February and April. Great strides have been mad...


USA | 10 February 2016
Rise In cattle numbers driving down beef prices

Matt Stockton, an ag economist for UNL's West Central Research and Extension Center says the rising number of cattle is driving down price. "When prices are first recognized and start going up the ...



Trending Now

Viewed
Discussed

Farms and Land for sale


Holiday Rentals search



Top stories you may have missed
Username
Password