VIEW ARTICLE

Fusarium Wilt of Chrysanthemum: Complete Control of Symptoms With an Integrated Fungicide-Lime-Nitrate Regime. Arthur W. Engelhard, Associate Professor, Agricultural Research and Education Center, Institute of Food and Agricultural Science, University of Florida, Bradenton 33505; S. S. Woltz, Professor, Agricultural Research and Education Center, Institute of Food and Agricultural Science, University of Florida, Bradenton 33505. Phytopathology 63:1256-1259. Accepted for publication 2 April 1973. DOI: 10.1094/Phyto-63-1256.

Benomyl 50W, and BAS 3201-F 50W [methyl 1-(methylthioethylcarbamoyl)-2-benzimidazolecarbamate], drenched on potted chrysanthemums grown on a high-lime, all-nitrate-nitrogen cultural regime, provided complete control of the symptoms of Fusarium wilt (Fusarium oxysporum f. sp. chrysanthemi) on the highly susceptible cultivar ‘Yellow Delaware’. Rates as low as 15 g active ingredient/100 liters (0.125 lb/100 gal) drenched two times at 200 ml per 15-cm pot (6-inch) per application were effective and were not phytotoxic. Calcium hydroxide added to the soil and NaNO₃ as the only nitrogen source, contributed additively to the control of the disease. Lack of foliage and stem symptoms, excellent development of the flowers, and normal top weights and heights of the plants confirmed the control of Fusarium wilt. This fungicide, high-lime, all-nitrate-nitrogen regime appears to be the first report of the complete control of the symptoms of Fusarium wilt of chrysanthemum.