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Andy Robinson

Potato Extension Agronomist

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Blightline July 10, 2015

No late blight has been reported or confirmed in our region of ND, MN or MB. Late blight has been reported in potatoes in the states of CA, CO, FL, NH, NY, PA, TX, WA and WI in 2015. Late blight severity values in our regions have stabilized the past two days. Most irrigated locations have reached late blight severity values of 15, including Beach, Inkster, Karlsruhe, Leonard, Linton, Mandan, Michigan, Minot, Oakes, Robinson and Tappen. The non-irrigated locations of Ada, Humboldt, Rolla, Sabin, St. Thomas, Stephen and Warren have also accumulated 15 severity values. At this threshold value of 15, 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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