Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


The economic importance and general distribution of stem rust (Puccinia graminis) has warranted unlimited study and discussion of this plant disease among scientific and practical grain growers. Most of the study has been on the life cycle of stem rust in order to suggest control measures. Some workers express considerable importance on the heterocism of the fungus, thus favoring the elimination of the alternate hosts, which are universally adopted as species of the Berberis and related genera. Others recognize the importance of the alternate hosts, but do not believe in their indispensability. Since the campaign for the eradication of rust-susceptible species of Berberis was started in the thirteen north-central, wheat-growing states, this phase of the problem has received considerable attention among scientific workers. The importance of stem rust in South Dakota is well known. IN certain years ravaging epidemics have taken a toll of small-grain groups estimated at over $65,000,000. Practically every year, local or regional epidemics occur which cause some damage. With these facts in mind, a study of the epidemiology of stem rust in this State was undertaken with special reference to: (1) the overwintering of urediniospores, (2) the importance of in-blown spores, and (3) the incubation period of urediniospores. [Introduction -- Page 4]

Library of Congress Subject Headings

Wheat rusts
Puccinia graminis
Rust fungi -- South Dakota


Includes bibliographical references (page 32)



Number of Pages



South Dakota State College


No Copyright - Non-Commercial Use Only