{"id":4176,"date":"2010-11-03T00:00:00","date_gmt":"2010-11-03T04:00:00","guid":{"rendered":"http:\/\/www.farmchemicalsinternational.com\/2010\/11\/03\/fungicide-resistance-found-in-soybean-field\/"},"modified":"2019-09-16T13:42:42","modified_gmt":"2019-09-16T17:42:42","slug":"fungicide-resistance-found-in-soybean-field","status":"publish","type":"post","link":"https:\/\/www.agribusinessglobal.com\/es\/industry-news\/fungicide-resistance-found-in-soybean-field\/","title":{"rendered":"Resistencia a fungicidas encontrada en campo de soja"},"content":{"rendered":"<p>La investigaci\u00f3n realizada por la Universidad de Illinois (U of I) y la Universidad de Tennessee confirma que el hongo que causa la mancha foliar de ojo de sapo (FLS) de la soja, <em>Cercospora sojina<\/em>, ha mostrado resistencia a los fungicidas estrobilur\u00ednicos en un campo de soja de Tennessee.<\/p>\n<p>\u201cLos fungicidas de estrobilurina pertenecen a la clase qu\u00edmica conocida como inhibidores externos de quinona (QoI), que son el grupo de fungicidas foliares m\u00e1s ampliamente utilizado que se aplica a los cultivos de campo para controlar las enfermedades de las plantas\u201d, dice Carl Bradley, pat\u00f3logo de plantas de la U of I Extension.<\/p>\n<p>Estos fungicidas se pueden vender como productos de un ingrediente activo como Headline (BASF Corp.) o Quadris (Syngenta Crop Protection) o en productos que los combinan con un fungicida en una clase qu\u00edmica diferente conocida como inhibidores de desmetilaci\u00f3n, a veces denominados triazoles, dice. Los productos que incluyen una combinaci\u00f3n de estrobilurina-triazol de ingredientes activos incluyen Quilt (Syngenta Crop Protection) y Stratego (Bayer CropScience).<\/p>\n<p>Los fungicidas de estrobilurina se han considerado de alto riesgo para que los pat\u00f3genos f\u00fangicos desarrollen resistencia a ellos. Este estado de alto riesgo ha sido determinado por el Comit\u00e9 de Acci\u00f3n de Resistencia a Fungicidas (FRAC), un comit\u00e9 internacional que eval\u00faa la probabilidad de que los fungicidas desarrollen resistencia.<\/p>\n<p>&quot;Los hongos pat\u00f3genos de las plantas que desarrollan resistencia a los fungicidas de estrobilurina no son nuevos&quot;, dice Bradley. &quot;Esto ya ha ocurrido en papas y otros cultivos y sistemas de enfermedades donde ocurren m\u00faltiples aplicaciones de fungicidas durante la temporada de crecimiento&quot;.<\/p>\n<p>En las principales \u00e1reas de producci\u00f3n de soja en los EE. UU., Los campos de soja generalmente se tratan una vez durante la temporada con un fungicida (si es que se tratan), dice Bradley.<\/p>\n<p>\u201cSin embargo, nos sorprendi\u00f3 un poco encontrar resistencia tan pronto\u201d, agrega. &quot;Cada vez que aplica un fungicida, aumenta la presi\u00f3n de selecci\u00f3n y la oportunidad de seleccionar individuos en la poblaci\u00f3n de pat\u00f3genos que tienen resistencia o sensibilidad reducida al fungicida&quot;.<\/p>\n<p>En 2008, el laboratorio de Bradley comenz\u00f3 un proyecto financiado por la Asociaci\u00f3n de Soja de Illinois para desarrollar un programa de monitoreo de resistencia a fungicidas. Desde entonces, su laboratorio ha estado obteniendo muestras, realizando pruebas y monitoreando aislamientos recolectados en Illinois.<\/p>\n<p>\u201cEste a\u00f1o, decidimos lanzar nuestra red un poco m\u00e1s lejos, particularmente en el sur\u201d, dice. \u201cEn Tennessee, FLS es una de las principales enfermedades foliares de la soja. El Dr. Melvin Newman de la Universidad de Tennessee me envi\u00f3 muestras de un campo que hab\u00eda sido rociado dos veces con fungicidas de estrobilurina pero que segu\u00eda teniendo altos niveles de FLS, lo que era una indicaci\u00f3n de una posible resistencia a los fungicidas \u201d.<\/p>\n<p>El equipo de Bradley confirm\u00f3 que la sensibilidad de los aislados de Tennessee se redujo en comparaci\u00f3n con la sensibilidad de los aislados de referencia.<\/p>\n<p>En pruebas en placa de Petri realizadas en la U de I, las esporas de aislados de <em>Cercospora sojina<\/em> germinado en presencia de altas concentraciones de azoxistrobina, piraclostrobina y trifloxistrobina, que son los ingredientes activos de la estrobilurina que se encuentran en Quadris, Headline y Stratego.<\/p>\n<p>\u201cEsto demostr\u00f3 que est\u00e1bamos tratando con aislamientos que tienen una sensibilidad reducida a los fungicidas de estrobilurina\u201d, dijo. \u201cActualmente, Tennessee es el \u00fanico estado en el que hemos documentado aislamientos como estos, pero continuamos realizando pruebas en aislamientos recolectados de campos en Illinois y otros estados\u201d.<\/p>\n<p><em>(Fuente: Jennifer Shike, Facultad de Ciencias Agr\u00edcolas, del Consumidor y Ambientales, Universidad de Illinois)<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Una investigaci\u00f3n realizada por la Universidad de Illinois (U of I) y la Universidad de Tennessee confirma que el hongo que\u2026<\/p>","protected":false},"author":110,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[489],"tags":[],"class_list":["post-4176","post","type-post","status-publish","format-standard","hentry","category-industry-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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