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Disease Name
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Causal Organism/Vector
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Distribution
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Management/Control
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Reference
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Additional Information
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Greasy Spot
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Mycosphaerella citri and other Mycosphaerella spp.
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Uncertain; widespread in the Caribbean area; some problems occur elsewhere and may due to other species of Mycosphaerella.
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Foliar applications of petroleum oils or various fungicides.
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Mondal and Timmer, 2006
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May cause severe defoliation and fruit blemishes, especially on grapefruit and lemons.
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Sweet Orange Scab
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Elsinoe australis
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South America
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Application of sterol-inhibiting fungicides, ferbam, benzimidazoles, strobilurins, or copper products.
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Timmer et al., 2004
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Only important for fresh fruit production.
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Postbloom Fruit Drop
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Colletotrichum acutatum
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Western Hemisphere
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Application of fungicide such as benzimidazoles, strobilurins, captan, maneb, or ferbam. A computer assisted system has been developed for timing fungicide applications.
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Timmer et al., 1994; Peres et al., 2005 ; Timmer and Brown, 2000
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Only important where rainfall is high during bloom.
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Alternaria Brown Spot
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Alternaria alternata
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First described in Australia in 1903; Mediterranean; Caribbean Basin; South Africa; South America
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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.
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Timmer et al., 2003; Akimitsu et al., 2003
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Only affects some tangerines and hybrids; spreading in semi-arid areas.
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