home news forum careers events suppliers solutions markets expos directories catalogs resources advertise contacts
 
Solution Page

Solutions
Solutions sources
Topics A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
  Species
 

Bremia race evolution demands integrated action - The International Bremia Evaluation Board (IBEB) has verified three official new races of the disease affecting lettuce crops – which pose a significant increased risk of infection and highlight the danger of reliance on varietal resistance alone


United Kingdom
August 19, 2013

Bremia Downy Mildew on lettuce

Lettuce growers are now being advised to adopt a more integrated approach to tackle the increasingly severe issues of Bremia affecting leaf quality, shelf life and overall marketable yield.

Syngenta Salad Crop Specialist, Christopher Lees, reported that varietal resistance remained a key attribute to minimise the impact of Bremia infection, but that growers must be vigilant for new disease isolates and implement an integrated approach using fungicides to combat the threat.   

“The rapid evolution in Bremia races is obviously of concern to lettuce producers and drives home the need to support genetic resistance with a robust crop protection programme. We are fortunate in having a range of effective fungicides, such as REVUS,” advised Mr Lees.

In trials under extreme Bremia lactucae (Downy Mildew) pressure last summer, REVUS was the most effective of the fungicides tested in terms of general crop health, leaf area affected by the disease and overall ground cover

Lettuce Trial

Despite the high disease pressure and being in an area heavily cropped with lettuce, the REVUS treated crop achieved 87% ground cover at maturity (above, right), compared to just 50% in the untreated (above, left). 

“It clearly confirmed the agronomic importance of utilising a strong crop protection programme alongside varietal resistance,” reported Mr Lees. He advocated that growers should incorporate REVUS within a programme containing a range of chemistry, with the short seven-day harvest interval of REVUS making it particularly well placed as the last application in a programme.

Lettuce Crop

Mr Lees added that Syngenta has a strong portfolio of commercial lettuce varieties with excellent physiological attributes and strong resistance packages against Bremia. Furthermore, exciting new varieties of even stronger genetic material, with excellent agronomic traits and an improved range of resistances, were set to be launched over the coming season.

He believed the strategy of incorporating genetics and crop protection products as an Integrated Crop Solution, would ensure effective long-term sustainability for lettuce production.

Mr Lees highlighted that Syngenta is the only manufacturer that can help to address both the genetic and crop protection components of growers’ Bremia strategies. “We are able to offer truly integrated programmes, to ensure robust protection now and into the future."

The International Bremia Evaluation Board (IBEB) has evaluated all Bremia races found in and prior to 2012. Three new incidences have been identified and, effective as of 1 August 2013, verified as official races: Bl:29, 30 and 31. Prior to this, only four new Bremia races had been identified and designated in the past decade, representing a significant increase in the prevalence of different races that could impact on the effectiveness of varietal resistance.

 



More solutions from:
    . Syngenta Seeds Ltd. (UK)
    . Syngenta Crop Protection UK Ltd


Website: http://www.syngenta.co.uk

Published: August 19, 2013

 

 

 

 

 

 

 

 

 

 

 

 


Copyright @ 1992-2024 SeedQuest - All rights reserved