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07/10/2010 12:26:41
Brassica disease risks rise
Significant increases in the UK oilseed rape area could create new disease pressures for vegetable brassica growers, with this season’s September onset of recorded Phoma infections one of the earliest starts to attacks for years. Light Leaf Spot (LLS) has also been recorded infecting brassica crops as far south as Lincolnshire this year.
However, providing growers maintain their focus on controlling Ringspot and White Blister with robust autumn fungicide programmes, the added threat should be averted, according to Andy Richardson of the Allium & Brassica Centre. Reports on the Syngenta Brassica Alert website this week (4 October, below) highlight ’red high risk’ for the three major brassica diseases, with most growers treating accordingly, he advises.
"The very dry spring/summer has made it a relatively late start for disease this year, with inoculum levels comparatively low," he says. "White Blister was held back by conditions in the early summer, although Ringspot pressure is now increasing and must be routinely addressed."
For growers currently making their third application in the autumn fungicide programme, Mr Richardson advocates Amistar Top, with its combination of strobilurin, to protect against White Blister, and a triazole for Ringspot control. The higher rate of difenoconazole in the pre-formulated Amistar Top gives more robust control and added activity on the oilseed rape derived diseases.
Most crops will already have received an initial strobilurin and one straight triazole, he reports, with programmes to be completed with another triazole if disease pressure continues. Mr Richardson calculates that growers tailoring fungicide application timing according to the Brassica Alert disease forecasts have typically saved one fungicide application so far this year.
"It does mean that we have one ’in the bank’, if disease pressure continues to hot up over the coming weeks," he says. Growers not yet registered for Brassica Alert can log on to the Syngenta website – http://www.syngenta-crop.co.uk – or click here to go straight to the relevant web page.
However, providing growers maintain their focus on controlling Ringspot and White Blister with robust autumn fungicide programmes, the added threat should be averted, according to Andy Richardson of the Allium & Brassica Centre. Reports on the Syngenta Brassica Alert website this week (4 October, below) highlight ’red high risk’ for the three major brassica diseases, with most growers treating accordingly, he advises.
"The very dry spring/summer has made it a relatively late start for disease this year, with inoculum levels comparatively low," he says. "White Blister was held back by conditions in the early summer, although Ringspot pressure is now increasing and must be routinely addressed."
For growers currently making their third application in the autumn fungicide programme, Mr Richardson advocates Amistar Top, with its combination of strobilurin, to protect against White Blister, and a triazole for Ringspot control. The higher rate of difenoconazole in the pre-formulated Amistar Top gives more robust control and added activity on the oilseed rape derived diseases.
Most crops will already have received an initial strobilurin and one straight triazole, he reports, with programmes to be completed with another triazole if disease pressure continues. Mr Richardson calculates that growers tailoring fungicide application timing according to the Brassica Alert disease forecasts have typically saved one fungicide application so far this year.
"It does mean that we have one ’in the bank’, if disease pressure continues to hot up over the coming weeks," he says. Growers not yet registered for Brassica Alert can log on to the Syngenta website – http://www.syngenta-crop.co.uk – or click here to go straight to the relevant web page.
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