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Andy Robinson

Potato Extension Agronomist

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Blightline July 26, 2013

Current recommendations: Late blight has 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 still remain relatively low. 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. Thank you for using the NDSU Potato Blightline.
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