Database Research Summaries
2017 Determination of Phytophthora sojae populations and assessment of management strategies

calendar_today Year of Research: 2017
update Posted On: 12/04/2019
group Martin Chilvers (Principal Investigator, Michigan State University)
bookmark Michigan Soybean Promotion Committee

Research Focus

The focus of this project is to survey pathotypes and examine the best management practices (seed treatments and resistance packages) that will provide useful information to Michigan soybean farmers.


  • Collect soil and bait Phytophthora sojae and P. sansomeana isolates from across Michigan.
  • Determine P. sojae pathotypes using soybean differentials.
  • Determine in-vitro fungicide sensitivity of Phytophthora isolates to determine if fungicide chemistries are effective, and to monitor for shits in fungicide sensitivity.
  • Determine in-field management of P. sojae and P. sansomeana with varieties and seed treatments, including new seed treatments and varieties.


Sampling fields within Michigan currently, with 57 sampled so far. This fall we plan on starting to bait the fields that have been collected from.


This project will the first relevant to this topic in over twenty years. Phytophthora sansomeana is a newly described species that can cause disease on soybean, corn and other plant species. Not much is known about P. sansomeana and the damage that it may be causing. Farmers will now be able to know the damage it causes and how to prevent and treat it.

For more information about this research project, please visit the National Soybean Checkoff Research Database.

Funded in part by the soybean checkoff.