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First Late Blight Infection of 2018 Reported in MI Potatoes

August 16, 2018
This agronomic image shows late blight in potato leaves.

Late blight has been confirmed in a commercial potato field located in Monroe County, MI, per an August 15th report on the Syngenta late blight hotline by Dr. Jaime Willbur of Michigan State University. The detection was made near the edge of the field and the infected leaves were located in the upper canopy of mature potato plants.

The first symptoms of the disease are small, light-to-dark green, circular or irregular shaped water-soaked spots and lesions usually first appear on the lower leaves. Lesions is in this infection were brown and water-soaked, with sporulation visible underneath the leaves.

Wet, cool conditions in southern and eastern MI have been favorable for the development of late blight. Dr. Willbur strongly recommends that MI growers continue to scout their fields for any new infections, particularly in areas that are difficult to treat like tree lines and irrigation pivots. Hear Dr. Willbur’s August 15th update below:

Orondis® Opti fungicide has activity against Phytophthora infestans, the late blight-causing pathogen in this field. With 2 powerful active ingredients, oxathiapiprolin and chlorothalonil, Orondis Opti provides excellent control of late blight.

To recieve text alerts when Dr. Willbur updates the Syngenta late blight hotline, text “BLIGHTMI” to 97063.

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