Effects of Nitrogen Fertilization on Cylindrocladium Black Rot of Peanuts and Peanut Yield. J. K. Pataky, Former Graduate Research Assistant, Department of Plant Pathology, North Carolina State University, Raleigh 27650. M. C. Black, Former Research Assistant, Joyce Hollowell, Agricultural Research Technican, and M. K. Beute, Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Plant Dis. 68:674-677. Accepted for publication 11 April 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-674.

The effect of nitrogen fertilization on Cylindrocladium black rot (CBR) of peanuts and peanut yield was examined in Cylindrocladium crotalariae-infested fields and in an uninfested field. When CBR was severe, soil applications of 168 kg N/ha (applied as ammonium nitrate granules) reduced incidence of CBR and pod rot caused by C. crotalariae compared with treatments of 84 kg N/ha. Soil applications of high rates of ammonium nitrate also decreased yields. Consequently, yield increases that could have resulted from less CBR that occurred in plots treated with high rates of nitrogen were nullified by the effects of these treatments on peanut yield.

Keyword(s): Arachis hypogaea.