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Thesis (M.S.)—University of Nebraska—Lincoln, 1930. Department of Agronomy.


Copyright 1930, the author. Used by permission.


The chief purpose of this study has been to determine the effect of the seed-borne disease, Diplodia, and of seed treatment upon the development of the resultant corn crop as indicated by the variability of certain plant characters. Diplodia zeae was selected as being representative of that group of seed-borne diseases known as root rots or seedling blights, and studies were confined to this one disease to permit the use of larger populations and greater detail in observation and calculation.While the disease also manifests itself as a stalk and ear rot, this paper deals chiefly with the seedling blight stage which occurs as the result of seed-borne infection.

Several tests were done and results were recorded on such topics as the emergence of seedlings as affected by disease and treatment, the presence of disease in the seed as indicated by the modified rag doll test, the effect of disease and of treatment on per cent of inferior plants and the effect of disease and of treatment on seedling height and weight.

Advisor: T. A. Kiesselbach