All of the several species and varieties of Rhamnus exposed to infection with Puccinia coronata Corda show some degree of infection with some form of crown rust. Eleven species of Rhamnus produced aecidiospores which were able to infect oats, from teleutospores developed on oats. Of the susceptible buckthorn species, only Rhamnus cathartica, R. lanceolata and R. alnifolia occur in Iowa. The former is a cultivated species imported from Europe that has escaped from cultivation in many places. Rhamnus lanceolata is commonly found along the small streams and shaded dry runs throughout the southern half of this state and as far north as Sioux City on the Missouri river and McGregor on the Mississippi. Rhamnus alnifolia is confined to a few counties in extreme northeastern Iowa.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Dietz, S. M.
"Response of the Genus Rhamnus to Puccinia coronata Corda,"
Proceedings of the Iowa Academy of Science, 31(1), 130-131.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/23