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Andy Robinson

Potato Extension Agronomist

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Blightline July 28, 2014

Late blight has not been reported in our region of ND, MN or MB. The late blight severity threshold value of 15 has been reached at all locations except Beach, Leonard, and Williston, which are at 13, 10 and 14 respectively. Weather conditions at all sites except these three have accumulated sufficiently for late blight to occur if inoculum is present, and application of a protectant fungicide such as mancozeb or chlorothalonil should be applied on a 7-10 day schedule is recommended.
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