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Fusarium Wilt of Chrysanthemum: Effect of Nitrogen Source and Lime on Disease Development. S. S. Woltz, Plant Physiologist, Institute of Food and Agricultural Sciences, University of Florida, Agricultural Research and Education Center, Bradenton, Florida 33505; Arthur W. Engelhard, Associate Plant Pathologist, Institute of Food and Agricultural Sciences, University of Florida, Agricultural Research and Education Center, Bradenton, Florida 33505. Phytopathology 63:155-157. Accepted for publication 5 July 1972. DOI: 10.1094/Phyto-63-155.

Nitrate-nitrogen decreased the severity of Fusarium wilt of Yellow Delaware chrysanthemum in comparison with half ammonium, half nitrate-nitrogen. Liming also reduced the severity of wilt. Nitrate-nitrogen together with calcium hydroxide decreased wilt additively. The severity of disease generally decreased with increasing soil pH. A visual disease rating system correlated well with root and shoot growth and discoloration of vascular bundles and root systems.