Influence of Foliar Applications of Micronutrients and Fungicides on Foliar Necrosis and Leaf Spot Disease of Chrysalidocarpus lutescens. A. R. Chase, Assistant Professor of Plant Pathology, IFAS, University of Florida, Agricultural Research Center, Apopka 32703. R. T. Poole, Professor of Ornamental Horticulture, IFAS, University of Florida, Agricultural Research Center, Apopka 32703. Plant Dis. 68:195-197. Accepted for publication 25 August 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-195.

Chelates of copper, iron, manganese, and zinc and fungicides containing these elements were applied to Chrysalidocarpus lutescens (areca palm) as sprays at recommended rates to determine their effects on foliar necrosis and fungal leaf spot incited by Exserohilum rostratum. Single applications of all chelated micronutrients caused foliar necrosis under greenhouse conditions, and copper or iron chelate also caused damage under shadehouse conditions. Cupric hydroxide caused symptoms similar to those caused by copper chelate. Fungal leaf spot was controlled by ferbam, mancozeb, or zineb in shadehouse trials and by micronutrient applications in greenhouse trials.