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ARS Home » Midwest Area » West Lafayette, Indiana » Crop Production and Pest Control Research » Research » Publications at this Location » Publication #78265
Title: NEW AND IMPORTANT RACES OF PHYTOPHTHORA ATTACKING SOYBEANS IN THE MIDWEST

Author
item ABNEY, THOMAS

Submitted to: Meeting Abstract
Publication Type: Proceedings
Publication Acceptance Date: 1/20/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The Rps1-k gene has been widely used in breeding programs for resistance to PR root rot. New PR races and abundant moisture have increased PR root rot damage in Northern states since 1990. An extensive study of PR races from soil and field plants in Indiana identified nine strains or races of the PR fungus (PHYTOPHTHORA SOJAE) as occurring regularly in Indiana. Three of these races (race 25, 28 and 33) are capable of killing soybeans with the Rps1-k gene, but can be controlled by the Rps3 or Rps6 gene. The Rps genes conferring resistance to new and important races will be used in breeding programs to minimize yield losses and help keep soybean varieties grown by farmers in the Midwestern states resistant to PR root rot.