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During 1978 and 1980, 199 isolates of Phytophthora sojae were obtained from soil samples from 16 fields in northwest Ohio using a soybean leaf disk bait procedure, and 53 isolates were obtained from diseased soybean plants. During 1990 and 1991, 282 isolates of P. sojae were obtained from diseased soybean cv. Sloan or Amcor 89 seedlings planted in soil from 88 fields in northwest Ohio, and 27 isolates were obtained from field-grown plants with the Rps1-k resistance gene. All isolates were identified as to their race phenotypes by inoculation of differential soybean cultivars having Rps1-a, Rps1-b, Rps1-c, Rps1-d, Rps1-k, Rps3-a, or Rps6 resistance genes
A. F. Schmitthenner (Sat,) studied this question.