Scientists like Shelley Jansky need access to genetic diversity to develop varieties that are resistant to pests and extreme weather. She?s working on solving the problem of verticillium wilt, a common fungus in the soil.Through the potato gene bank, Jansky has found a wild species of potato from South America that?s mostly immune to verticillium wilt.”It?s a tremendous resource that?s right at my fingertips. I call them and say, ?Can you send me this, this and this?? and they send me seeds in the mail,” said Jansky, a U.S. Department of Agriculture research scientist and associate professor of horticulture at the University of Wisconsin, Madison.