Wild potato germplasm that offers resistance to some major potato diseases has been identified by Agricultural Research Service scientists.

Geneticists Dennis Halterman and Shelley Jansky, both with the Vegetable Crops Research Unit in Madison, Wis., have found that Solanum verrucosum contains a gene with resistance to late blight.

The wild species can be crossed with cultivated potatoes, and efforts are under way to move the late-blight resistance gene into the commercial potato gene pool.

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