Description: Phytophthora damping off is recognized as a pre- or post-emergence damping off. Affected seedlings have brown, water-soaked lesions on the hypocotyl. Phytophthora root rot is recognized on adult plants as a severe root rot with stem discoloration that may extend several nodes up the stem.

Location: Phytophthora root rot has been a problem in the heavy clay soils throughout Ohio, particularly in the northwest, with the increase in the use of reduced tillage. The disease has been reported in most soybean growing counties of the state, due to adaptations by the Phytophthora population to the most commonly planted Rps genes. Time of infection: Seedling damping off occurs when rainfall saturates the soil soon after planting. Saturated soils also favor root rot of adult plants later in the season. Soybeans planted in compacted soils or soils with poor drainage are particularly vulnerable to seedling and adult plant kill.

Management:
· Resistant varieties
· Crop rotation
· Improve drainage