Potato Extension


Andy Robinson

Potato Extension Agronomist


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Blightline August 5, 2019

Late blight has not been reported in ND, MN or MB. Small outbreaks of late blight are reported in WA, WI and PA. The spore-trapping network in ND and MN has not detected spores of P. infestans, the cause of late blight. The high humidity, morning dew and rain showers are providing extended conditions that favor late blight infection. We commonly see first late blight infections in the field in early August, so it is important for all growers and consultants to actively scout fields for late blight, especially near pivots, shelterbelts and other areas that stay wet for longer periods.
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