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Andy Robinson

Potato Extension Agronomist

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Blightline July 5, 2017

No late blight has been reported in ND, MN or MB. Late blight severity values continue to accumulate, particularly in the non-irrigated locations in the northern Red River Valley production area. Many areas are approaching the late blight threshold value of 15 indicating that conditions have been favorable for late blight infection if inoculum is present. A protectant fungicide should be applied before the threshold value reaches 15 or just prior to row closure, whichever occurs first. The hot weather predicted for this week will not be favorable for late blight.
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