Occurrence of Different Species of <i>Fusarium</i> from Wheat in Relation to Disease Levels Predicted by a Weather-Based Model in Argentina Pampas Region
<i>Fusarium</i> head blight (FHB) is an important disease throughout many of the world wheat-growing areas that have humid to semi-humid climate. The infection happens mainly during the anthesis of the wheat, when there have been favorable conditions of moisture and temperature. The dire...
| Autores: | , , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | Argentina |
| Recursos: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/130859 |
| Acesso em linha: | http://sedici.unlp.edu.ar/handle/10915/130859 |
| Access Level: | acceso abierto |
| Palavra-chave: | Ciencias Exactas Biología Ciencias Naturales Fusarium head blight incidence Fusarium spp. Identification criteria Meteorological conditions Wheat-growing season |
| Resumo: | <i>Fusarium</i> head blight (FHB) is an important disease throughout many of the world wheat-growing areas that have humid to semi-humid climate. The infection happens mainly during the anthesis of the wheat, when there have been favorable conditions of moisture and temperature. The direct relation of the infection to environmental factors makes possible the formulation of mathematical models that predict the disease. The causal agent of the FHB of the spike of wheat is attributed principally to <i>Fusarium graminearum</i>. High economic losses due yield decrease have been recorded in Argentina. In the present work, 67 isolates of <i>Fusarium</i> spp. were obtained from samples of wheat grains from Pampas region from 15 locations distributed in Buenos Aires, Entre Rios, Santa Fe and Corboba provinces during 2006 and 2007 wheat-growing seasons. The identification of species from monosporic isolates was carried out by morphological characterization and use of species-specific PCR-based assays. Both identification criteria were necessary and complementary for the species determination, since in some cases the molecular identification was not specific. Scanty presence of <i>F. graminearum</i> was observed in 2006 wheat-growing season coinciding with the lack of favorable meteorological conditions for producing FHB infection events. High presence of <i>F. graminearum</i> isolates was observed in 2007 wheat-growing season, in accordance with moderate incidence of the disease according to spatial distribution of FHB incidence values. The aim of this report was to identify the causal agent of the FHB disease by different taxonomic criteria and to relate its occurrence with disease incidence values predicted by a weather-based model in Argentina. |
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