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Andy Robinson

Potato Extension Agronomist

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Blightline for July 5, 2016

No late blight has been reported in ND or MN. Late blight severity values are beginning to accumulate in northern and eastern ND and northwestern MN due to the recent rains, and are nearing the threshold value of 15. The Rolla site is at 17 and a protective fungicide should be applied to potatoes in that area to protect against late blight. At this value, the accumulated weather conditions are favorable for late blight infection if inoculum is present.
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