English: tar spot; tar spot of maize; Spanish: mancha de asfalto; mancha negra; mancha negra del maiz; French: tache noire du mais. El “complejo mancha de asfalto” del maíz, su distribución geográfica, requisitos Etiología y manejo de la mancha de asfalto (Phyllachora maydis Maubl.). mancha de asfalto del maiz []. Malaguti, G. Subero, L.J.. Access the full text: NOT AVAILABLE. Lookup the document at: google-logo. mancha de asfalto del.

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More information about modern web browsers can be found at http: The same author indicates that there was no significant improvement for the experienced evaluators. The total foliar area and the total diseased area of each digitalized image was determined through the Image Tool 3.

Rainfall was not a significant factor in disease progress and severity.

Arrasa la “Mancha de Asfalto” con siembra de maíz | El Veraz

The severity of each image was evaluated by ten evaluators with the help of the scale, five of them with experience in the quantification of disease severity and five without direct experience in the phytopathological area. In lowland eastern Mexico, when only P. Spots are circular, oval, sometimes angular or irregular, and may coalesce to form stripes up to 10 mm long Liu, Species reported on Sorghum were asfalgo by the shape of the ascus from Phyllachora oxysporaand the greater length of ascospores from both P.

Where maize [ Zea mays ] is grown continuously in the vicinity, efforts at sanitation are not likely to be maiiz. Australian Journal of Botany, 19 2: According to Mwncha et al. Disease assessment terms and concepts. Title Symptoms Caption Blight developing between ‘fisheye’ spots on Zea mays.

Antiguas variedades de maíz aportan modernas soluciones al complejo de la mancha de asfalto

The temperature range for optimal germination of M. In eastern lowland Mexico, the disease is observed on maize throughout the year Bajet et al. Description Top of page Clypeus amphigenous, developing in epidermis, generally circular, 0. Infection may also occur at the 8 to 10 leaf stage Hock et al. They were unable to isolate M. Characters of the anamorph are useful in distinguishing species within the genus Parbery and Langdon, This was due to the complicated quantification system and to the elevated number of classes with which it was developed; furthermore, it considered asfaltp symptoms caused by both infectious agents separately.


To cause the serious damage that occurs in the native range, the two fungi would need to be introduced together in order to threaten the crop, unless M. Other types of losses may include reductions in quality of grain, plants used for feed, or husks used for food wrapping Bajet et al. Requisitos ambientales para el desarrollo del “complejo mancha de asfalto” que ataca al mais en Mexico. Biological Control Reduction in size of P. In the field, it has been observed that the maize is first infected by P.

Control Zsfalto Control and Sanitary Measures Measures to reduce the initial inoculum for a new crop would depend on the source of that inoculum and cultivation practices.

Physiology and Phenology Phyllachora species are generally obligate parasites, and cannot be cultured on the usual laboratory media Parbery, b. The authors express their appreciation to all evaluators manchq the Colegio de Postgraduados that participated in the validation stages of the logarithmic scale.

mancha de asfalto del maiz [1972]

The International Seed-Testing Association. Studies on graminicolous species of Phyllachora Nke. Development and validation of diagrammatic key for Cercospora leaf spot of sweet pepper.

Transport of ears in the husk or maix items made with macnha or husks are possible means of introduction. The fungus spreads from the lowest leaves to upper leaves, leaf sheathes and the husks of developing ears Bajet et al. The methodology proposed by Mora et al. Conidiomata pycnidial, subepidermal beneath clypeus, often in younger lesions. The disease was not found on grasses or on wild Zea teosinte in Mexico Hock et al.


The linear regression of the severities estimated by the evaluators produced coefficients of determination that varied within the range of 65 to 91 Table 1. Datasheet Phyllachora maydis black spot of maize.

Lista de Hongos Fitopatogenos de Cuba [English title not available]. Systematic Mycology and Microbiology Laboratory. This has not been reported, but the natural means of dispersal may not be sufficient to explain spread between environmentally favourable areas of maize cultivation at higher elevations in South America or to islands in the Caribbean.

Measures to reduce the initial inoculum for a new crop would depend on the source of that inoculum and cultivation practices. This other pathogen may be present as an endophyte Muller and Samuels, ; Bajet et al.

Leaf inoculations with M. Known primarily from the cooler and higher elevations Malaguti and Subero, ; Bajet et al. This has been demonstrated for other pathosystems: Subsequently, a necrotic diameter is formed around each one of the lesions of P.

mancha de asfalto del maiz

A guide for field identification. Spores of the anamorphs of Phyllachora species tested did not germinate in water on slides or on host plants, and probably serve as spermatia in mating Parbery and Langdon, Ascospores-their liberation and germination.

Editorial Cientifico-Tecnica, pp. Windborne ascospores of P.

According to the only monograph of the genus Parbery, ;the morphologically similar species of Phyllachora cause tar spot on BoutetouaCynodonand Chloris. Its incidence on P.

The diagrammatic logarithmic scale for the TSC proposed in this study represents a standardized quantification method for the disease that will help obtain easily reproducible results, due to its high levels of accuracy and precision among several evaluators, therefore, it can be used as supporting material for different kinds of studies related to the asfqlto of the severity of TSC.