Three ways to prevent Blight
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Control of Blight in potato dumps and clamps with Osorno
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Potato dumps act as a primary source of Blight. Control of shoots is essential to prevent spread of Blight to the new crop
Osorno containing dichlobenil is an alternative to straight glyphosate. One application per year at 30g/sq metre using a granule applicator at the start of growth will give cost effective control
Dumps should be levelled prior to treatment
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Control of volunteer potatoes with Tandus
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A second source of Blight is volunteer potatoes in cereals left over from the the previous autumn. These potatoes sprout and produce an early source of Blight.
Volunteer potatoes can be controlled with Tandus. Containing fluroxypyr, Tandus will control potato shoots from 10 to 40cm in height.
Tandus can be used in cereals up to and including the boot swollen stage (GS 45)
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Control of Potato Blight in the crop
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 This picture shows the decimating effect of Blight in a Nufarm trial. The green plot behind was sprayed at regular intervals with Matilda. Spores and disease will spread to the tubers where the real economic damage is done and there is the potential to completely destroy the crop
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A Smith or Blight period is defined as a period of two consecutive days when the the temperature has not dropped below 10 degrees centigrade and the relative humidity has been above 90% for at least 11 hours
A Blight period encourages sporulation. Regular Blight periods every 7-10 days are ideal conditions for Potato Blight
Potato Blight products are generally preventative with limited curative action. A regular spray is essential protect new leaves and prevent infection. Use shorter spray intervals when Blight periods occur especially if they occur frequently
One of the most cost effective and widely used treatments for Blight is a mixture of cymoxanil and mancozeb. There is no recorded blight resistance to this mixture. Nufarm market 3 top quality formulations; Maltilda, Solace and Nautile. Unlike many Blight fungicides, these products have no LERAP requirement. Potatoes can be sprayed at a minimum spray interval of seven days until the potato haulm dies down or is desiccated
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Always read the label: use pesticides safely
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