{"id":1911,"date":"2021-05-07T11:50:08","date_gmt":"2021-05-07T14:50:08","guid":{"rendered":"https:\/\/summit-agro.com\/ar\/es\/?p=1911"},"modified":"2021-12-09T20:04:34","modified_gmt":"2021-12-09T23:04:34","slug":"1911","status":"publish","type":"post","link":"https:\/\/summit-agro.com\/py\/es\/1911\/","title":{"rendered":"\u00bfPor qu\u00e9 seguimos hablando de Rama negra?"},"content":{"rendered":"<p><a href=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-2032 size-full\" src=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1.jpg\" alt=\"\" width=\"1495\" height=\"538\" srcset=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1.jpg 1495w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-300x108.jpg 300w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-1024x369.jpg 1024w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-768x276.jpg 768w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-1080x389.jpg 1080w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-1280x461.jpg 1280w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-980x353.jpg 980w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-480x173.jpg 480w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-horizontal-1-600x216.jpg 600w\" sizes=\"(max-width: 1495px) 100vw, 1495px\" \/><\/a><\/p>\n<p>Hace ya m\u00e1s de 10 a\u00f1os que Rama negra es una de las malezas presente en pr\u00e1cticamente todos los lotes agr\u00edcolas, por lo que volver a presentarla parecer\u00eda redundante. No obstante, caracter\u00edsticas de su morfolog\u00eda, biolog\u00eda y ecolog\u00eda hacen que no podamos descuidarnos ni una sola campa\u00f1a, porque veremos resentidos los rendimientos de los cultivos. Repasemos entonces las caracter\u00edsticas que hacen de Conyza una maleza tan competitiva para nuestro sistema productivo.<\/p>\n<p>Largo per\u00edodo de emergencia<br \/>\nComo sabemos, Rama negra es una maleza oto\u00f1o-invernal, por lo que en el oto\u00f1o ocurre la mayor parte de sus nacimientos. Pero el periodo puede extenderse desde principios del oto\u00f1o hasta entrada la primavera, dependiendo de la zona, las condiciones clim\u00e1ticas del a\u00f1o, el cultivo presente, etc. Este comportamiento obliga a realizar repetidas aplicaciones o, lo que es recomendable, utilizar herbicidas residuales en los barbechos que puedan controlar sucesivas camadas.<\/p>\n<figure id=\"attachment_1917\" aria-describedby=\"caption-attachment-1917\" style=\"width: 567px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-REM.png\"><img decoding=\"async\" class=\"wp-image-1917 size-full lazyload\" data-src=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-REM.png\" alt=\"\" width=\"567\" height=\"266\" data-srcset=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-REM.png 567w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-REM-300x141.png 300w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Rama-Negra-REM-480x225.png 480w\" data-sizes=\"(max-width: 567px) 100vw, 567px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 567px; --smush-placeholder-aspect-ratio: 567\/266;\" \/><\/a><figcaption id=\"caption-attachment-1917\" class=\"wp-caption-text\">\u00a0<\/figcaption><\/figure>\n<p style=\"text-align: center;\">Camadas de emergencia de Rama negra para diferentes a\u00f1os y localidades<\/p>\n<p style=\"text-align: center;\">REM, Aapresid<\/p>\n<p>Elevada producci\u00f3n de semillas y forma de dispersi\u00f3n<\/p>\n<p>Las plantas que completen su ciclo con suficientes recursos pueden producir hasta 200.000 semillas, es decir que si dejamos semillar a esta maleza tenemos el banco asegurado con creces para el pr\u00f3ximo a\u00f1o. Pero lo que agrega dificultad es su mecanismo de dispersi\u00f3n, preferentemente anem\u00f3filo (por el viento). Esto hace imposible \u201caislarse\u201d de lo que suceda en lotes vecinos, incluso de varios kil\u00f3metros, por lo que Rama negra siempre est\u00e1. Este movimiento de semillas a distancia cobra especial relevancia para los biotipos resistentes, que pueden diseminarse entre zonas alejadas en pocas campa\u00f1as.<\/p>\n<p>Banco superficial y sensibilidad al sombreo<\/p>\n<p>Rama negra posee un banco de semillas muy superficial y su germinaci\u00f3n resulta fuertemente inhibida si se la ubica en profundidad, por lo que la siembra directa ofrece el ambiente ideal para esta especie de semilla muy peque\u00f1a.<\/p>\n<p>La cobertura deprime marcadamente la cantidad de nacimientos. Esta cobertura puede ser muerta, es decir rastrojo de cultivos anteriores, o viva de un cultivo en pie sea de renta o de cobertura. Las peores situaciones se dan entonces en barbechos de lotes en siembra directa con escasa cobertura o \u201cpelados\u201d, al poseer un importante banco de semillas y ninguna barrera que inhiba su emergencia.<\/p>\n<p><a href=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA.jpg\"><img decoding=\"async\" class=\"aligncenter wp-image-1919 size-full lazyload\" data-src=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA.jpg\" alt=\"\" width=\"1039\" height=\"797\" data-srcset=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA.jpg 1039w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA-300x230.jpg 300w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA-1024x785.jpg 1024w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA-768x589.jpg 768w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA-980x752.jpg 980w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA-480x368.jpg 480w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/RAMA-NEGRA-600x460.jpg 600w\" data-sizes=\"(max-width: 1039px) 100vw, 1039px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1039px; --smush-placeholder-aspect-ratio: 1039\/797;\" \/><\/a><\/p>\n<p style=\"text-align: center;\">Pl\u00e1ntula y semillas en superficie<\/p>\n<p style=\"text-align: center;\">Fuente: Ing. Agr. Mart\u00edn Marzetti.<\/p>\n<p>Desarrollo de resistencia a herbicidas<br \/>\nEn el a\u00f1o 2012 se confirm\u00f3 cient\u00edficamente la existencia de biotipos resistentes a glifosato, presentes en Entre R\u00edos en un comienzo. En el a\u00f1o 2019 nuevos estudios determinaron la presencia de un biotipo resistente a Inhibidores de ALS, postemergentes en un principio y luego tambi\u00e9n preemergentes. La zona n\u00facleo de esta problem\u00e1tica es el sur de Santa Fe y el norte de Buenos Aires, pero como se explic\u00f3 anteriormente, los l\u00edmites son muy permeables para Conyza. Para completar el status nacional de resistencia, actualmente se encuentra en alerta amarilla un biotipo del noreste de Buenos Aires posiblemente resistente a glifosato, a inhibidores de ALS, al inhibidor de PPO saflufenacil y a los hormonales 2,4D y dicamba. Esto implica que se han detectado fallas a campo y se est\u00e1n haciendo los estudios pertinentes para confirmar o desestimar la sospecha.<\/p>\n<p>A causa de esto, la recomendaci\u00f3n es mezclar y rotar los herbicidas inhibidores de ALS (metsulfuron, clorimuron, clorsulfuron, diclosulam, etc.) con activos de otros sitios de acci\u00f3n y hacer un monitoreo exhaustivo de los lotes, ya que estrategias que funcionaban muy bien en campa\u00f1as anteriores pueden comenzar a fallar.<\/p>\n<p>P\u00e9rdida de sensibilidad a mayor tama\u00f1o de la maleza<br \/>\nSi bien es una caracter\u00edstica com\u00fan de las malezas, en Conyza es muy evidente como su sensibilidad a los herbicidas disminuye marcadamente al comenzar a elongarse. El paso de roseta a elongaci\u00f3n suele darse con el aumento de las temperaturas de fines de agosto o principios de septiembre. Aquellas plantas que germinan en esta \u00e9poca elongan r\u00e1pidamente sin pasar por la etapa de roseta. Este comportamiento tiene implicancias para el manejo: las plantas nacidas en el oto\u00f1o pasan el invierno como roseta y al comenzar a elongarse suelen tener muchas hojas y una considerable ra\u00edz, lo que requiere ser tenido en cuenta al definir los herbicidas y las dosis necesarias. Las malezas nacidas directamente en primavera no cuentan con estas estructuras, pero crecen r\u00e1pidamente en altura, por lo que, con pocos d\u00edas de demora puede perderse eficacia de control si no se ajusta la estrategia.<\/p>\n<p><a href=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra.png\"><img decoding=\"async\" class=\"aligncenter wp-image-1922 size-full lazyload\" data-src=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra.png\" alt=\"\" width=\"805\" height=\"665\" data-srcset=\"https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra.png 805w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra-300x248.png 300w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra-768x634.png 768w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra-480x397.png 480w, https:\/\/summit-agro.com\/py\/es\/wp-content\/uploads\/2021\/05\/Comparativo-rama-negra-600x496.png 600w\" data-sizes=\"(max-width: 805px) 100vw, 805px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 805px; --smush-placeholder-aspect-ratio: 805\/665;\" \/><\/a><\/p>\n<p style=\"text-align: center;\">Diferencias entre planta de Rama negra emergida en oto\u00f1o (izquierda) y en primavera (derecha)<\/p>\n<p style=\"text-align: center;\">Fuente: Ing. Agr. Mart\u00edn Marzetti<\/p>\n<p>Rustificaci\u00f3n por sequ\u00eda<br \/>\nEn inviernos secos o en aquellas zonas de escasas precipitaciones invernales, la maleza sufre un proceso de rustificaci\u00f3n. Esto suele estar acompa\u00f1ado de acumulaci\u00f3n de tierra que se adhiere a la abundante pilosidad de sus hojas. Ante estas situaciones, y m\u00e1s a\u00fan si no se ha restablecido el r\u00e9gimen h\u00eddrico, se dificultan marcadamente los controles primaverales debido a la falta de sistemia de los herbicidas, increment\u00e1ndose as\u00ed la probabilidad de rebrotes. Por esto, es deseable llegar a la primavera solo con plantas chicas recientemente nacidas por haber realizado controles oportunos en oto\u00f1o, acompa\u00f1ados de herbicidas con residualidad.<\/p>\n<p>Autor: Ing. Agr. Mart\u00edn Marzetti, asesor privado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hace ya m\u00e1s de 10 a\u00f1os que Rama negra es una de las malezas presente en pr\u00e1cticamente todos los lotes agr\u00edcolas, por lo que volver a presentarla parecer\u00eda redundante. No obstante, caracter\u00edsticas de su morfolog\u00eda, biolog\u00eda y ecolog\u00eda hacen que no podamos descuidarnos ni una sola campa\u00f1a, porque veremos resentidos los rendimientos de los cultivos. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2034,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[79],"tags":[],"class_list":["post-1911","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novedades"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfPor qu\u00e9 seguimos hablando de Rama negra? - Summit Agro Paraguay<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/summit-agro.com\/py\/es\/1911\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00bfPor qu\u00e9 seguimos hablando de Rama negra? - Summit Agro Paraguay\" \/>\n<meta property=\"og:description\" content=\"Hace ya m\u00e1s de 10 a\u00f1os que Rama negra es una de las malezas presente en pr\u00e1cticamente todos los lotes agr\u00edcolas, por lo que volver a presentarla parecer\u00eda redundante. No obstante, caracter\u00edsticas de su morfolog\u00eda, biolog\u00eda y ecolog\u00eda hacen que no podamos descuidarnos ni una sola campa\u00f1a, porque veremos resentidos los rendimientos de los cultivos. 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