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Disease Name

Causal Organism/Vector




Additional Information

Greasy Spot

Mycosphaerella citri and other Mycosphaerella spp.

Uncertain; widespread in the Caribbean area; some problems occur elsewhere and may due to other species of Mycosphaerella.

Foliar applications of petroleum oils or various fungicides.

Mondal and Timmer, 2006

May cause severe defoliation and fruit blemishes, especially on grapefruit and lemons.

Sweet Orange Scab

Elsinoe australis

South America

Application of sterol-inhibiting fungicides, ferbam, benzimidazoles, strobilurins, or copper products.

Timmer et al., 2004

Only important for fresh fruit production.

Postbloom Fruit Drop

Colletotrichum acutatum

Western Hemisphere

Application of fungicide such as benzimidazoles, strobilurins, captan, maneb, or ferbam. A computer assisted system has been developed for timing fungicide applications.

Timmer et al., 1994; Peres et al., 2005 ; Timmer and Brown, 2000

Only important where rainfall is high during bloom.

Alternaria Brown Spot

Alternaria alternata

First described in Australia in 1903; Mediterranean; Caribbean Basin; South Africa; South America

Minimize leaf wetness (avoiding overhead irrigation); use of disease-free nursery trees; avoiding excessive nitrogen fertilization and irrigation; application of foliar fungicides. alter-rater, a predictive system, has been developed to time sprays.

Timmer et al., 2003; Akimitsu et al., 2003

Only affects some tangerines and hybrids; spreading in semi-arid areas.

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