Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Plant Pathology


A seedling disease has been observed throughout the flax-growing areas of South Dakota for a number of years. The importance of this disease has probably been overlooked, however, because of the sporadic and unpredictable serious outbreaks; but in recent years the disease has reached epiphytotic proportions and hundreds if acres have been destroyed and plowed under. In some fields, stands have been so severely thinned that weeds have become a serious problem and yields of flax have been markedly reduced. The specific cause if these serious outbreaks of seedling blight in South Dakota was not known. Preliminary observations, however, suggested that it may have been due to Rhizoctonia solani Kühn oone of several pathogens known to cause similar losses in stands of flax. In the present study, basic information essential to development of control measures for South Dakota has been sought. This paper deals with the identification of the causal fungi, study of the symptoms they induce, conditions which influence the expression of the disease, and investigations of methods of control.

Library of Congress Subject Headings

Flax -- Disease and pests


Includes bibliographical references (page 69-71)



Number of Pages



South Dakota State University


No Copyright - Non-Commercial Use Only