Potato Extension


Andy Robinson

Potato Extension Agronomist


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Blightline July 1, 2015

No late blight has been reported in our region of ND, MN or MB. Late blight has been reported in potatoes in Adams County, and more recently in Waushara County,WI. Late blight has been reported in potatoes in Franklin County, WA. The genotypes have not yet been identified. Late blight severity values in our area have stabilized somewhat are accumulating slower. Several irrigated locations have reached late blight severity values of 15, including Beach, Inkster, Leonard, Linton, Michigan, Oakes and Robinson. At this threshold value, accumulated conditions are conducive for late blight if inoculum is present; growers are encouraged to apply a protective fungicide such as chlorothalonil or mancozeb.
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