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Andy Robinson

Potato Extension Agronomist

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Blightline July 8, 2016

No late blight has been reported in ND, MN or MB. Late blight (US23) has been reported near Bronson in Branch County, Michigan, and in Maryland.  Late blight severity values are accumulating in north central ND and northwestern MN due to the recent rains, and some sites have reached or are nearing the threshold value of 15. At this value, the accumulated weather conditions are favorable for late blight infection if inoculum is present. The protective fungicides manzozeb and chlorothalonil provide protection for both late and early blight and are best applied just before or at row closure. We recommend that growers continue to scout often for late blight.
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