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Distribution of virulent populations of Heterodera glycines in Minnesota. The numbers represent soybean lines on which the H. glycines populations produced female index greater than 10.1 = Peking, 2 = PI 88788, 3 = PI 90763, 4 = PI 437654, 5 = PI 209332, 6 = PI 89722, 7 = 548316, and 8 = Pickett 71.
