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Aerial Versus Ground Application of Fungicides to Control Brown Rot of Citrus Fruit. Z. Solel, Division of Plant Pathology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel. Plant Dis. 67:878-880. Accepted for publication 19 January 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-878.

The performance of copper fungicides to control brown rot of Citrus spp., caused by Phytophthora citrophthora, by a single aerial application was inferior to a standard single ground application. Yet in most experiments, the degree of control achieved by spraying from a helicopter was acceptable. The advantages of a single ground application with a supplementary aerial treatment are discussed. When applied from the ground, copper hydroxide (Kocide 101) at 4.6 kg/ha was less effective than a Bordeaux mixture at 20 kg/ha of pentahydrated copper sulfate.