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Andy Robinson

Potato Extension Agronomist

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Blightline July 17, 2017

No late blight has been reported in ND, MN or MB. Late blight has been reported in central WA (US8) and in MI (US23). Late blight severity values accumulated in the northern half of the Red River Valley in both MN and ND. Many areas have reached or exceeded the late blight threshold value of 15. This indicates that conditions have been favorable for late blight infection if inoculum is present. A protectant fungicide should be applied when the threshold value reaches 15 or just prior to row closure, whichever occurs first. It continues to be important to scout for late blight in those areas where the threshold has been reached concentrating on areas of the field that stay wet longer such as along tree lines and low areas where water accumulates.

Blightline July 17, 2017 (pdf)

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