Severity of Drechslera leaf spot (Drechslera setariae) of Calathea picturata ‘Vandenheckei’ was affected by potassium fertilization rate with ½, 1 or 2 times the recommended rate (1400 g/m3) causing a reduction in number of lesions caused by Drechslera setariae compared to plants receiving no potassium. In addition, plant quality, height and number of leaves were unaffected by potassium rate during the test period. Leachate electrical conductivity was unaffected by these potassium rates and was approximately 1000 μhos/cm two months after fertilization.

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Author notes

Florida Agricultural Experiment Stations Journal Series No. R01186

2Professor of Plant Pathology, Central Florida Research and Education Center, University of Florida, IFAS, 2807 Binion Rd., Apopka, FL 32703.

3Professor of Environmental Horticulture, Ft. Lauderdale Research and Education Center, University of Florida, IFAS, 3205 S. W. College Ave., Ft. Lauderdale, FL 33314.