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Andy Robinson

Potato Extension Agronomist

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Late Blight in Potato

The primary host is potato, but P. infestans also can infect other solanaceous plants, including tomatoes, petunias and hairy nightshade, that can act as source of inoculum to potato. In North America, late blight survives between seasons in infected seed tubers, cull piles and volunteer plants. Knowing the symptoms and disease cycle of this rapidly destructive disease is necessary to implement management options.

A new NDSU and University of Minnesota Extension bulletin on Late Blight in Potato is now available. For late blight confirmation, samples can be sent to the NDSU Pest Diagnostic laboratory or the NDSU Plant Pathology Department.

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