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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Fruit – young fruit lesions occur on immature fruit for 4 months post petal fall and cause slightly citricox dark spots with yellow halos. During the packing process, the tops of alternaria lesions may be lopped off, making visual identification difficult. Early fruit drop is common, especially if infection has occurred shortly after petal fall.

Lesions are flat and visible on both sides on the leaf. Some spores come from fruit lesions but they are not a major inoculum source.


This tool is part of the Citrus Resource. In the later stages of the disease, the corky tissue can fall out, forming craters cutricos pockmarks on the surface of the fruit.

Citrus Diseases

Rain events or sudden changes in relative humidity also favor spore release. Leaf – initial foliar lesions occur on young tissue as small brown to black spots that develop prominent yellow halos. Grapefruit and lemons may also be affected. Alternaria citrcios lesions can crack around the outer edge, giving a moat-like appearance.

The fruit rind responds to infection by forming a barrier of corky tissue that erupts from the surface. The disease is likely found in other countries that produce susceptible cultivars. Spores are produced on older lesions formed on wilted twigs and mature leaves.

Alternaria brown spot citrics lesions are easily confused with citrus canker.

Fact Sheet: Alternaria | Citrus Diseases

A fungal toxin is produced that can cause necrosis and chlorosis along the veins extending from cirricos. Even the leaf contributes to the inoculum.

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On more mature fruit, lesions can vary from small specks to large pockmarks. Alternaria is spread by airborne spores.

Alternaria is extremely common on certain cultivars of tangerines while citrus canker is uncommon on tangerine cultivars. Dancy tangerine hybrids [‘Minneola’ tangelo ‘Honeybell”Orlando’ tangelo, ‘Sunburst’, ‘Nova,’ and ‘Lee’] and ‘Murcott’ ‘Honey’ tangerine frequently have fruit infections of alternaria brown spot.

Alternaria limicola – Wikipedia

Although the spores are airborne and carried by winds, citricod brown spot is often spread among groves on nursery stock transported by humans. Citrus Diseases March, idtools. Lesions expand into irregular or circular necrotic areas which can involve large portions of the leaf, especially on highly susceptible cultivars like ‘Minneola’. Older lesions have a brittle paper-like texture in the middle of the lesions.

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