The four described Alternaria diseases of citrus include: (i) Alternaria Mancha foliar de los citricos is caused by A. limicola Simmons & Palm. Isolation, Pathogenicity, and Partial Host Range of Alternaria limicola, Causal Agent of Mancha Foliar de los Citricos in Mexico. MARY E. PALM, USDA-ARS. Alternaria Rot Worldwide, Alternaria species can cause four distinct diseases of citrus: Alternaria leaf spot of Rough Lemon, mancha foliar de los citricos, and.

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Citrus Diseases

On more mature fruit, lesions can vary from small specks to large pockmarks. Grapefruit and lemons may also ciitricos affected. Lesions expand into irregular or circular necrotic areas which can involve large portions of the leaf, especially on highly susceptible cultivars like ‘Minneola’.

Lesions are flat and visible on both sides on the leaf.

Alternaria limicola – Wikipedia

Early fruit drop is common, especially if infection has occurred shortly after petal fall. Alternaria brown spot fruit lesions are easily confused with citrus canker. A fungal toxin is produced that can cause necrosis and chlorosis along the veins extending from lesions. During the packing altegnaria, the tops of alternaria lesions may be alrernaria off, making visual identification difficult. Even the leaf contributes to the inoculum. Rain events or sudden changes in relative humidity also favor spore release.


Fact Sheet: Alternaria | Citrus Diseases

Alternaria is extremely common on certain cultivars of tangerines while citrus canker is uncommon on tangerine cultivars. Spores are produced on older lesions formed on wilted twigs and mature leaves.

Although the spores are airborne and carried by winds, alternaria brown spot is often spread among groves on nursery stock transported by humans. Some spores come from fruit lesions but they are not a major inoculum source.

The fruit rind responds to infection by forming a barrier of corky tissue that erupts from the surface. Dancy tangerine hybrids [‘Minneola’ tangelo ‘Honeybell”Orlando’ tangelo, ‘Sunburst’, ‘Nova,’ and ‘Lee’] and ‘Murcott’ ‘Honey’ tangerine frequently have fruit infections of alternaria brown spot. Older lesions have a brittle paper-like texture in the middle of the lesions.

The disease is likely found in other countries that produce susceptible cultivars. Citrus Diseases March, idtools. Fruit – young fruit lesions occur on immature fruit for 4 months post petal fall and cause slightly sunken dark spots with yellow halos. This tool is part of the Citrus Resource. Alternaria fruit lesions can crack around the outer edge, giving a moat-like appearance.


Leaf – initial foliar lesions occur on young tissue as small brown to black spots that develop prominent yellow halos. Ciyricos the later stages of the disease, the corky tissue can fall out, forming craters or pockmarks on the surface of the fruit. Alternaria is spread by airborne spores.