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Andy Robinson

Potato Extension Agronomist

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Blightline July 25, 2016

Late blight has not been reported in ND or MN. Finally, we are looking forward to good drying weather after the rounds of thunderstorms last week that added more rain to already too wet fields. The excessive rain dramatically increased late blight severity values in northern and eastern ND and northwestern MN, and many sites have exceeded the threshold value of 15. This is especially true in non-irrigated fields. Late blight can move long distance with thunderstorms, and it is possible that late blight can leapfrog from western MB to northern ND where abundant water and conditions favorable for late blight are present. Growers should scout frequently for late blight and apply a protectant fungicide to fields, including fields that may be abandoned due to water damage.
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