Pythium -
Seed Decay, Seedling Blight and Root Rot -
Pythium species
Root and Stem Diseases
of Soybeans - University of Illinois Extension
Seed rotted in soil, commonly soft, wet, and overgrown by other fungi are usually killed before emergence by this fungus. Rapid death prevents accurate diagnosis. Roots are brown, watery, soft and often completely decayed. Limited infection may produce brown lesions on roots, hypocotyl, or cotyledons. Death of meristem tissue may result in a swollen hypocotyl. These species are often called “Water Molds.” They survive in soil and in plant residue. Cool (50ºF to 60ºF) and wet soils favor release of “swimming” spores and infection develops rapidly. Younger seedlings are most susceptible because soybeans become more resistant as they age.
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