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Blightline July 31, 2013
Late blight has still not been reported in North Dakota, Minnesota or Manitoba. All late blight of potatoes and tomatoes reported this year are east of the Mississippi River, including Wisconsin, Michigan, New York and Maine. Our cool weather has resulted in morning dews that favor late blight infection, and our late blight severity values increased slightly at almost all locations the past two days. 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 and Robinson. 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. Because of the low late pressure fungicide application intervals can be extended to 10-12 days.
Form Folder VCS/ICS calendar Potato Diagnostics
Questions about your potato crop? Use this form to submit to NDSU/U of M potato diagnostics. If the problem can be diagnosed through this form, a response will be provided. If we need a physical sample we will request a sample be shipped for further diagnostic identification in a laboratory or request a field visit. Please fill out the requested information and attach a minimum of one picture of the problem (more pictures will help with diagnostics).
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