Written by janineadamson from CPM Magazine
With conditions highly conducive to blight this season, growers are being warned to protect tubers from infective spores.
This is backed by reports of UK blight outbreaks which have been submitted for testing to the Fight Against Blight (FAB) campaign – now topping 135 incidences.
While growers have responded with robust blight control strategies, attention has turned to protecting tubers from the inevitable threat of infective spores, warns Syngenta technical manager, Andy Cunningham.
“Keeping up with the programme to maintain blight-free foliage is still crucial for building tuber yield, especially in crops where wet and cool conditions delayed planting and early growth,” he advises.
“But turning to include products which provide specific strong tuber blight protection will further help assure yields and tuber quality.”
Evagio Forte
According to Andy, this is the case for the new Evagio Forte, which combines both the foliar blight control of mandipropamid with the added strength of amisulbrom, to enhance performance and target tuber blight.
“In addition to the built-in resistance management offered by the combination of active ingredients with different modes of action, Evagio Forte is particularly well suited for use from flowering through to the end of the programme,” says Andy.
Syngenta trials have shown that Evagio Forte delivers an improved foliar blight performance over straight Revus (mandipropamid), as well as excellent tuber blight control through its zoospore activity.
Potato blight lesions typically produce sporangia that can spread long distances on the wind during warmer conditions (17-24⁰C), but as conditions cool, below 17⁰C, they’re more likely to produce zoospores which physically move shorter distances in surface moisture that infects tubers.
Research backing
Research has shown that amisulbrom works to protect against tuber blight infection in multiple ways. Firstly, it significantly reduces the production of infective zoospores from any existing blight lesions in the crop even when applied in an early curative situation.
It then targets blight zoospores by inhibiting their release but also impacting their motility to effectively stop the spread of spores within the film of moisture on the leaf or in the soil. Zoospores are typically active for 2-10 hours and move using a combination of flagella whips; limiting this action can help to prevent zoospores from moving down to tubers.
The trials indicate the zoospore-inhibiting properties of amisulbrom would remain at active concentration for at least the duration between typical spray intervals, and could offer additional protection thereafter.
Application guidance
Amisulbrom is also rapidly taken up and absorbed by the leaf to prevent it being washed off by rain or irrigation soon after application. “Syngenta advocates treatment with Evagio Forte using the 3D ninety nozzle. The larger droplets and angled spray pattern deliver greater coverage of lower leaves and stems to stop spore spread,” advises Andy.
In larger, post-flowering canopies, application in at least 200 litres water volume will further help achieve good coverage of the leaf area to protect against blight, he concludes.
The post Beware of tuber blight appeared first on Crop Production Magazine.
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With conditions highly conducive to blight this season, growers are being warned to protect tubers from infective spores.
This is backed by reports of UK blight outbreaks which have been submitted for testing to the Fight Against Blight (FAB) campaign – now topping 135 incidences.
While growers have responded with robust blight control strategies, attention has turned to protecting tubers from the inevitable threat of infective spores, warns Syngenta technical manager, Andy Cunningham.
“Keeping up with the programme to maintain blight-free foliage is still crucial for building tuber yield, especially in crops where wet and cool conditions delayed planting and early growth,” he advises.
“But turning to include products which provide specific strong tuber blight protection will further help assure yields and tuber quality.”
Evagio Forte
According to Andy, this is the case for the new Evagio Forte, which combines both the foliar blight control of mandipropamid with the added strength of amisulbrom, to enhance performance and target tuber blight.
“In addition to the built-in resistance management offered by the combination of active ingredients with different modes of action, Evagio Forte is particularly well suited for use from flowering through to the end of the programme,” says Andy.
Syngenta trials have shown that Evagio Forte delivers an improved foliar blight performance over straight Revus (mandipropamid), as well as excellent tuber blight control through its zoospore activity.
Potato blight lesions typically produce sporangia that can spread long distances on the wind during warmer conditions (17-24⁰C), but as conditions cool, below 17⁰C, they’re more likely to produce zoospores which physically move shorter distances in surface moisture that infects tubers.
Research backing
Research has shown that amisulbrom works to protect against tuber blight infection in multiple ways. Firstly, it significantly reduces the production of infective zoospores from any existing blight lesions in the crop even when applied in an early curative situation.
It then targets blight zoospores by inhibiting their release but also impacting their motility to effectively stop the spread of spores within the film of moisture on the leaf or in the soil. Zoospores are typically active for 2-10 hours and move using a combination of flagella whips; limiting this action can help to prevent zoospores from moving down to tubers.
The trials indicate the zoospore-inhibiting properties of amisulbrom would remain at active concentration for at least the duration between typical spray intervals, and could offer additional protection thereafter.
Application guidance
Amisulbrom is also rapidly taken up and absorbed by the leaf to prevent it being washed off by rain or irrigation soon after application. “Syngenta advocates treatment with Evagio Forte using the 3D ninety nozzle. The larger droplets and angled spray pattern deliver greater coverage of lower leaves and stems to stop spore spread,” advises Andy.
In larger, post-flowering canopies, application in at least 200 litres water volume will further help achieve good coverage of the leaf area to protect against blight, he concludes.
The post Beware of tuber blight appeared first on Crop Production Magazine.
Continue reading on CPM website...
If you are enjoying what you read then why not considering subscribing here: http://www.cpm-magazine.co.uk/subscribe/
