Importance
Phytophthora root and stem rot of soybean was first observed in the USA in Indiana in 1948 and its causal agent, Phytophthora sojae, first identified in 1958. In the 1970s, soybean plants only had one single-resistance gene, meaning they were more susceptible to an infection. Eventually plants with this gene were killed by new races of Phytophthora sojae. As a result, several states suffered significant yield losses particularly in the state of Ohio, which lost 300,000 acres of soybean plants in a year. Soon thereafter, a variety of new disease prevention methods were implemented and as a result this disease is currently one of the well-managed and well-known soybean diseases in the USA.
Read more about this topic: Phytophthora Sojae
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—Ralph Waldo Emerson (1803–1882)
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—Alicia F. Lieberman (20th century)