"In a given field, you can have up to 8 different species of Pythium. And all can have a different temperature profile, so you always have a species that can infect the plant."
—Dr. Anne Dorrance, Ohio State University
Pythium species act extremely fast and begin attacking the host soybean plant within 90 minutes of planting.
Stanghellini ME and Hancock JG, 1971a.