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Within-field Pathogenic Diversity of Phytophthora sojae in Commercial Soybean Fields in Iowa

A. E. Robertson, S. R. Cianzio, S. M. Cerra, and R. O. Pope

September 2009

Research

Previous surveys of the pathogenic diversity of P. sojae in Iowa did not investigate whether multiple pathotypes existed in individual fields. We collected several soil samples collected systematically from each of two commercial fields with a history of Phytophthora root and stem rot in Iowa, and each soil sample was baited separately for isolates of P. sojae. Numerous pathotypes of P. sojae were detected from both fields.

doi:10.1094/PHP-2009-0908-01-RS

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