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Late Blight Confirmed in WA Potatoes

July 17, 2018

Late blight was found and confirmed north of Pasco, WA in the first week of July. The infected field was treated with a fungicide 12 days prior to the report. North of Pasco, fields should be treated with fungicide on a 7 day application schedule. As of the writing of this post, the Syngenta late blight hotline had not received any other reports of infection.

Fields with late blight should be on a 5 to 7 day fungicide application schedule. Sprinkler irrigated fields should be treated with a late blight fungicide 1 to 7 days before any major rain. OrondisĀ® Opti fungicide offers control you can rely on, even under heavy disease pressure.

For more local late blight information in Washington, consult Potatoes at WSU. For up-to-date information on late blight conditions in WA, ID, ND, OR, and MI, call into the Syngenta late blight hotlines.

This chart shows the pathologists available to discuss potato issues.

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