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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The logarithmic scale was generated through the 2-Log V1.

Phyllachora maydis (black spot of maize)

Another member of the fungus complex associated with tar spot is Coniothyrium phyllachoraea pycnidial fungus that is considered to be a hyperparasite on Phyllachora. Accidental Introduction This has not been reported, but the natural means of dispersal manhca 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.

This has been reported, among others, by Barbosa et al. Distribution Table Top of page The distribution in this summary table is based on all the information available.

Journal of Agriculture of the University of Puerto Rico, 42 3: Phyllachora species are generally obligate parasites, and cannot be cultured on the usual laboratory media Parbery, b.

Incidence of tar spot disease of corn in Puerto Rico.

In the field, it has been observed that the maize is first infected by P. Distribution Maps Top of page You can pan and zoom the map.

The anamorphic form of Monographella maydis usually grows in the necrotic areas around the ascomata Muller and Samuels, ; Bajet et al.


In addition, important questions concerned with whether Monographella maydis or a related species, an endophyte, or epiphyte of maize elsewhere, introduced with P. The precision values observed in the evaluators without experience are acceptable; prior training could have a positive influence on the quality of the evaluations.

The precision and accuracy was determined by a simple linear regression analysis between actual and estimated severity. 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.

Pest or symptoms not visible to the naked eye but usually visible asalto light microscope. Ds of the mais are useful in distinguishing species within the genus Parbery and Langdon, Table 1 Estimate of the interception parameters b0slope b1and coefficient of determination r2 of the simple linear regression analysis calculated between the real and estimated severity of TSC, carried out by 10 evaluators with and without experience in the quantification of diseases.

Baker Red; Dale WT, Infection may also occur at the 8 to 10 leaf stage Hock et al. One or more of the features that are needed to show you the maps functionality are not available in the web browser that you are using. In lowland eastern Mexico, when only P.

In regards to this, Michereff et al. For additional descriptions see Dalby assfalto, OrtonParberyand Liu Inheritance of resistance to tar spot complex in maize. Don’t need the entire report?

Revista mexicana de fitopatología

The authors express their appreciation to all evaluators of the Colegio de Postgraduados that participated in the validation stages of the logarithmic maiiz. This has been demonstrated for other pathosystems: According to Sherwood et al.


Generate a print friendly version containing only the sections you need. In Mexico, disease is most severe at elevations of m and in the cooler months from November to April, at lower altitudes Bajet et al.

International Journal of Pest Management, 40 2: In eastern lowland Mexico, tar spot begins to appear approximately 2 weeks before flowering and reaches a maximum severity approximately 6 weeks later Hock et al. Under favorable conditions, the foliage of the plant may completely dry out in less than eight days due to the fusion of the lesions of the two pathogenic organisms and due to the possible production of a toxin Hock et al.

Therefore, the use of the diagrammatic scale for the evaluation of TSC generates a high concurrence with the real severity values, reflected in a high precision among the evaluators. Tar spot lesions containing C.

Entrez cross-database search engine. Illusions in visual assessment of Stagonospora leaf spot of orchardgrass.

Transactions of the Illinois State Academy of Science, The source of initial inoculum for both fungi is not determined. Greater losses were suggested to be dee where environmental conditions are more favourable or cultivars grown are more susceptible.

mancha de asfalto del maiz [1972]

Undiagnosed fungus, maize – Guatemala Studies on graminicolous species of Phyllachora Nke. Studies on the epidemiology of the tar spot disease complex of maize in Mexico.

Title Perithecia Caption Perithecia in cross section of tarspot lesion on Zea mays.