In addition to fresh peas, alfalfa is another crop where Aphanomyces root rot (ARR) causes significant economic damage. Whereas in peas "A. euteiches" usually occurs alone, in alfalfa it often occurs in conjunction "Fusarium" and "Pythium spp", two other root rot-causing pathogens. Thus although "A. euteiches" had been known as a pathogen of pea since the 1920s, in alfalfa it was often confused with other pathogens. It was not until the 1980s that scientists from the University of Wisconsin confirmed it as a significant pathogen of alfalfa. Since then, Aphanomyces root rot has been an emerging concern in alfalfa crops in the United States and Canada, and is considered widespread in Wisconsin.