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Abstract
Three major fungal diseases in Florida citrus groves that require control by chemical sprays are greasy spot (Mycosphaerella citri), melanose (Diaporthe citri) and scab (Elsinoe fawcettii). The salient features of pathogen behaviour and epidemiology are reviewed for each of these diseases. Timing of chemical sprays for optimum disease control is discussed in relation to local climatic conditions, seasonal bloom and shoot growth patterns and the mode of action of each spray material.