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Root and Stalk Rot in Corn as Affected by Fertilizer and Tillage Treatment¹

Synopsis: Low nitrogen fertility and the presence of crop residue on the soil surface were coincident with low incidence of rot. Potassium fertilization contributed slightly to decreased disease incidence. All factors that decreased disease incidence were also closely correlated with retarded early growth. Yield was depressed by severe infestation. However, it was impossible to show differential effect of disease on yield as affected by treatment because of interactions of yield, treatment, and disease incidence.

² Soil Microbiologist and Soil Scientist, respectively, Eastern Soil and Water Management Research Branch, ARS, USDA. The authors express appreciation to W. E. Larsen and W. G. Lovely, project leaders, for their cooperation, and to D. C. Foley for identification of the plant pathogens.

Received for publication October 22, 1958.