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.
|Published (Last):||11 May 2018|
|PDF File Size:||5.99 Mb|
|ePub File Size:||17.91 Mb|
|Price:||Free* [*Free Regsitration Required]|
Symptoms caused by M.
Revista mexicana de fitopatología
Despite the increasing importance of TSC in maize and the resulting need to carry out epidemiological or control studies, there is no standardized quantification method of the disease that provides easily reproducible results among investigators or institutions; therefore, the objective of this investigation was to design and validate a diagrammatic logarithmic severity scale for the maize – Phyllachora maydis and Monographella maydis – pathosystem that allows the evaluation of the damage caused by the disease in fields, analyzing the accuracy, precision and reproducible values generated with its use.
Biological Control Reduction in size of P. Finally, the use of standardized systems for the quantification of maize diseases, and those of any other crop, proves to be a powerful tool as it allows the perfect comparison of experiments carried out by different institutions and investigators.
These larger lesions coalesce after days; areas between spots become water-soaked and dry out. The value of the b 0 intercept was positive in almost all cases, which indicates that there is a tendency to overestimate the severity of the disease; this tendency was greater for the evaluators without experience. The disease they cause occurs in the cooler and higher elevations of Mexico, and Central and South America, and the West Indies, so their ability to spread over land through other climatic zones may be limited.
The pycnidia of the Linachora asexual state appear early in infection Parbery, ; Hock et al. Studies on the epidemiology of the tar spot disease complex of maize in Mexico. This has been reported, among others, by Barbosa et al.
Escala Diagramática de Severidad para el Complejo Mancha de Asfalto del Maíz
The distribution een this summary table is based on all the information available. Germination of Phyllachora maydis ascospores and conidia of Monographella maydis. Contribution of Reed Herbarium Reed Herbarium. In addition, important questions concerned with whether Monographella maydis or a related species, an endophyte, or epiphyte of maize elsewhere, introduced with P. Phyllachora species are generally obligate parasites, and cannot be cultured on the usual laboratory media Parbery, b.
Biology and Ecology Top of page Ascospores of Phyllachora spp. Like other species of Phyllachorait has a pycnidial anamorph in the genus Linochora Parbery, ; Muller and Samuels, Clypeus amphigenous, developing in epidermis, generally circular, 0.
Intensifican en Villa Clara control de hongos en el maíz
Title Asci Caption Asci of Phyllachora maydis. Subsequently, a necrotic diameter is formed around each one of the lesions of P.
The logarithmic scale was generated through the 2-Log V1. In this study, the symptoms of P.
Australian Journal of Botany, 2 2: Tar spot lesions containing C. It is the only species reported on Zea and is restricted to Zea Parbery, ; Characters of the anamorph are useful in distinguishing species within the genus Parbery and Langdon, Its incidence on P. Orton distinguished P.
Spots are circular, oval, sometimes angular or irregular, and may coalesce to form stripes up to 10 mm long Liu, A guide for field identification. Rainfall was not a major factor in severity of the disease in lowland eastern Mexico Hock et al. Accidental Introduction 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.
Watson lists it as present in Brazil, but Hock et al. Chemical Control Fenpropimorph one or two treatments and mancozeb applied every 10 days were found to be the most effective maoz in field plot tests in Mexico Bajet et al.
Tropical Pest Management The precision values observed in the evaluators without experience are acceptable; prior training could have a positive influence on dd quality of the evaluations.
The means of persistence and sources of initial inoculum other than maize [ Zea mays ] need to be determined. Given the increasing importance of the Tar Spot Complex, standardized methods for the quantification of the disease are required, methods that allow asfa,to 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.
Eb of resistance to tar spot complex in maize.
COMPARTE Y COMENTA
El “complejo mancha de asfalto” de maiz, su distribucion geografica, requisition ambientales e importancia economica en Mexico.
Baker Red; Dale WT, The evaluation considered ten evaluators and 50 plants with different levels of severity, determined by the Image Tool 3. 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 quantification of the severity of TSC.
The higher optimum for the second pathogen may be a factor in its later appearance, following P.