Phytophthora sojae
root and stem rot of soybean
Phytophthora megasperma f.sp. glycinea, Phytophthora megasperma var. sojae, Phytophthora sojae f.sp. glycines
Asia: China, Iran, Japan, Mongolia, Pakistan, South Korea; Europe: Bulgaria, Croatia, France, Italy, Poland, Russia, Ukraine; North America Canada, USA; Oceania: Australia; South America: Argentina, Brazil, Chile, Uruguay
AZ, AR, CA, DE, IL, IN, IA, KS, LA, MD, MI, MN, MS, MO, NE, NY, NC, ND, OH, PA, SD, VA, WA, WI
2025-09-09
fungus
China
Main: soybean; Other: lupine
PHYTMS
Phytophthora sojae primarily infects soybeans, causing root and stem rot. It survives in soil and crop debris for many years as long-lived oospores. Infection occurs mainly through water-dispersed zoospores, which are released in saturated soils and enter plants through roots or wounds. The pathogen is spread locally by surface water movement, soil adhering to equipment, and infected plant debris, but long-distance dispersal is primarily through movement of infested soil or contaminated irrigation water.
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