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Andy Robinson

Potato Extension Agronomist

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Blightline August 5, 2013

Late blight has still not been reported in North Dakota, Minnesota or Manitoba. The late blight severity values in most locations increased the past two days as a result of our cool weather, morning dews and sporadic showers, but late blight severity values are low. It is important to continue to scout fields for late blight, especially along tree lines and low areas that may hold moisture longer. The non-irrigated stations that have reached the late blight threshold severity value of 15 are: Ada, Cando, Eldred, Humboldt, Perley, Rolla, Sabin and Warren. The irrigated stations that have reached the late blight threshold value of 15 are: Beach, Hofflund, Inkster, Karlsruhe, Leonard, Linton, Michigan, Minot, Oakes, Robinson and Willliston. We recommend application of the first protectant fungicide when late blight threshold severity value of 15 occurs, just prior to row closure, or if late blight is found in your area, whichever occurs first.
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