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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mancha de asfalto del maiz 
The precision values observed in the evaluators without experience are acceptable; prior training could have a positive influence on the quality of the evaluations. Asgalto Top of page Mexico: Illusions in visual assessment of Stagonospora leaf spot of orchardgrass. From all the organisms associated with M. Orton distinguished P. Taxonomic Tree Top of page Domain: High levels of accuracy were observed; r 2 was comprised between the range of 0.
When several references jancha cited, they may give conflicting information on the status. Baker Red; Dale WT, Australian Journal of Botany, The accuracy, represented by the degree of proximity of the estimated values to the real values Nutter et al.
It is the only species reported on Zea and is restricted to Zea Parbery, ; Title Symptoms Caption ‘Fisheye’ spots developed around tarspots on Zea mays. The incidence of TSC causes severe yield losses and deteriorates the quality of the fodder; furthermore, it has the potential to entirely destroy parcels of land Pereyda et al.
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 of Phyllachora spp.
Tar spot lesions containing C.
This has been reported, among others, by Barbosa et al. Share this article Bookmarks. The International Seed-Testing Association. The source of initial inoculum for both fungi is not determined.
Revista mexicana de fitopatología
Other types of losses may include reductions in quality of grain, plants used for feed, or husks used for food wrapping Bajet et al. Distribution Maps Top of page You can pan and zoom the map. Incidence of tar spot disease of fn in Puerto Rico. Transport of ears in the husk or of items made with leaves or husks are possible means of introduction.
Intensifican en Villa Clara control de hongos en el maíz
xsfalto Characters of the anamorph are useful in distinguishing species within the genus Parbery and Langdon, Reduction in size of P. Survey of insect pests and plant diseases of selected food crops of Mexico, central America and Panama. American Phytopathological Society, In addition, it should be determined how susceptible to either pathogen maize cultivars grown elsewhere in environments favourable for tar spot are.
Studies on graminicolous species of Phyllachora Fckl. Not known to be seedborne or to infect other species, P. 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 Mabcha or to islands in the Caribbean.
Ascospores uniseriate in ascus, hyaline, aseptate, broadly ellipsoid, 5. No species of Phyllachora are reported as seedborne Richardson, More significant damage to leaves and yield is caused by the fungus Monographella wn whose infection follows that of the tar-spot fungus, at least where studied in Mexico Hock et al.
A guide for field identification.
More significant damage to leaves and yield is caused by the fungus Monographella maydis whose infec Phyllachora species are generally obligate parasites, and asflto be cultured on the usual laboratory media Parbery, b. In this study, the symptoms of P. According to his key, other North American species that are similar, occur on grasses in genera such as AndropogonAnthephoraBoutelouaPanicumPaspalumSpartina and Stenotaphrum. The clypeus stroma of Phyllachora species grows separately in the epidermis on either side of the leaf and is not an extension of the perithecia Parbery, b.
The methodology proposed by Mora et al. Detection and Inspection Top of page Lower leaves should be examined for small, raised, glossy, dark, circular, or oval to irregular, spots, or for brown lesions, often with a dark border, having a dark ascomata at the centres CIMMYT, Malaguti G; Subero LJ, Table aefalto 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.
Studies on the epidemiology of the tar dn disease complex of maize in Mexico. Elsewhere, removal of volunteer plants or wild maize relatives may be appropriate. Known primarily from the cooler and higher elevations Malaguti and Subero, ; Bajet et al. Like other species of Phyllachorait has a pycnidial anamorph in the genus Linochora Parbery, ; Muller and Samuels, Biological Control Reduction in size of P.
Escala Diagramática de Severidad para el Complejo Mancha de Asfalto del Maíz
Given the increasing importance of the Tar Spot Complex, standardized methods for the asgalto of the disease are required, methods that allow the conduction of accurate, precise, and reproducible epidemiological studies; understanding ‘accuracy’ as the proximity that an estimated value has to the real value, ‘precision’ as the variation or repeatability associated with an estimation, and ‘reproducibility’ as the absence of change in the estimations when several evaluators quantify the same characteristics Nascimiento et al.
Control Cultural 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. Foliar fungal diseases http: Graminicolous species of Phyllachora in North America. The diagrammatic logarithmic scale for the TSC proposed in this maiiz represents a standardized quantification method for the disease that will help obtain easily reproducible results, due to its high levels asfalho accuracy and precision among several evaluators, therefore, it can be used as supporting material for different kinds of studies related to the quantification of the severity of TSC.