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Andy Robinson

Potato Extension Agronomist

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Blightline July 29, 2013

Late blight has still not been reported in North Dakota, Minnesota or Manitoba. The cool weather has resulted in morning dews that favor late blight infection, but late blight severity values remain relatively low and were essentially unchanged at all locations. The non-irrigated stations that have reached the late blight threshold severity value of 15 are: Eldred, Humboldt, Perley, Rolla and Sabin. The irrigated stations that have reached the late blight threshold value of 15 are: Beach, Hofflund, Inkster, Karlsruhe, Leonard, Linton, Michigan, Oakes and Robinson. Growers should be ready to apply 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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