Brassica growers should start watching out for ring spot and light leaf spot, says expert

Now that the August Bank Holiday weekend is behind us brassica growers should switch their disease control priorities.

Image: Morguefile
Image: Morguefile
Simon Jackson, senior consultant at Lincolnshire-based Allium & Brassica Centre, said his main concern throughout July and August had been white blister – a disease favoured by hotter weather. Now, however, his attention is shifting to ‘the spots’ – namely ring spot and light leaf spot.

He said: "Sprout crops now have big canopies and the recent catchy weather has left leaves wet for long periods of the day while temperatures have been ideal for disease development. The wet August has also delayed cultivation of oilseed rape stubbles so there’s plenty of inoculum about to infect vegetable brassicas."

Generally growers have applied the first two treatments of their disease control programmes and, if not already done, will very soon be applying their third. For this Simon Jackson recommends Rudis (prothioconazole) as one of the strongest against all the spots. With the retailer’s quality demands as high as ever his plan – assuming disease development progresses as expected – is to follow this with a Nativo 75 Wg (trifloxystrobin + tebuconazole) treatment this month (September) and a final Rudis treatment in October.

Jackson adds: "Over the last few years supplies of Bayer’s fungicide Rudis have been tight so growers haven’t been able to include as much in the autumn starategy as desired. But with the manufacturer’s assurances that supply will be there to meet demand this season, we’re confident we can get two sprays into the latter part of programmes this year."

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