North America, Production/Agronomy, Studies/Reports, Weather/Climate

Potato late blight confirmed in Wisconsin today

The Wisconsin Potato Newsletter was released to the potato community todayIn the newsletter, Prof Amanda Gevens writes: Late blight on potato has been confirmed in Wood County this afternoon. We have a sample on campus in UW- Madison Vegetable Pathology and my technician will type this first thing in the morning so that we have an understanding of the clonal lineage (strain),  and likely character and mefenoxam (metalaxy-Ml) resistance status.  Sporulation was present but light on most leaves.  Lesions were quarter sized on upper leaves”.

Acccording to Dr Eugenia Banks in Ontario, the Potato Board’s spore traps located in Simcoe and Dufferin Counties detected low levels of late blight DNA earlier this week.

The PCR analysis was conducted by A&L Biologicals dr Banks says.  “This laboratory has “state of the art” PCR equipment that is very sensitive and capable of detecting very small amounts of late blight DNA, perhaps only a couple of spores per filter.”   

Late blight has not been found in Ontario yet, but the weather has been variable.  This week, some areas got rain, others nothing.  Irrigation has been the order of the day in Simcoe County.  Irrigation also provides favorable conditions for late blight.  

Dr Banks urges Canadian growers to monitor their fields regularly, specially areas prone to late blight: low spots, compacted areas, rows close to tree lines, field edges along creeks or ponds and pivot wheel tracks.

Keep your fields protected,!” she says. “An once of prevention is worth a pound of cure!

If you have any questions please contact dr Banks at

Editor & Publisher: Lukie Pieterse


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He will be most happy to share potato news stories from your country on Potato News Today.
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