On FieldClimate.Com we offer models for two Citrus diseases. Alternaria brown spot, caused by the fungus Alternaria alternata, affects a wide range of orange and mandarin varieties specially Murcott tangors. Where severe, the disease results in extensive fruit drop and must be controlled on processing and fresh market fruit. Postbloom fruit drop (PFD) is caused by the fungus Colletotrichum acutatum. It affects all species and cultivars of citrus. It must be controlled on processing and fresh market fruit. Navel and Valencia oranges do experienced the most severe damages.
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