Fred L. Bode

Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Plant Pathology


Yellow leaf spot, caused by Pyrenophora trichostoma (Fr.) Fckl., (Helminthosporium tritici repentis Died.) an ascomycetous fungus of widespread distribution, has played a minor role in the complex of foliar diseases afflicting Triticum species in South Dakota. However, with the introduction of cultural practices that leave large amounts of crop residue in the soil surface, the possibility exists that it may become a serious threat to wheat production in the Northern Great Plains region of the United States. This paper is a report of research on several aspects of the epidemiology and control of yellow leaf spot on wheat, with the following main objectives: 1) To induce conidial production ‘in vitro’. 2) To determine the relative resistance of a number of spring wheat breeding lines and cultivars. 3) To determine the influence of inoculum level and climatic factors on inoculum liberation under field conditions. 4) To determine if the spore germination bioassay is a useful technique for laboratory screening of fungicidal activity against the conidial stage of the pathogen.

Library of Congress Subject Headings

Wheat -- Diseases and pests




Number of Pages



South Dakota State University