\r\n\t\t\t\r\n\t\t\t Figura 1. Infestacion en un brote de naranja por Toxoptera citricida(pulgon marron de citricos). <\/strong><\/span><\/p>\r\n\r\n\t\t\tFoto: Lomeli y Valdez. <\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n \r\n Vector del CTV<\/strong><\/span><\/p>\r\n\r\nEl CTV es una enfermedad transmitida por insectos conocidos como áfidos o pulgones. La transmisión por pulgones ocurre de forma semi-persistente, ya que el virus puede ser adquirido y trasmitido por los pulgones en cuestión de segundos. La eficiencia de la transmisión depende de la especie del pulgón transmisor, la cepa del virus, el portainjerto y variedad, además de las condiciones ambientales.<\/p>\r\n<\/div>\r\n<\/div>\r\n\r\n \r\n <\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Cuadro 1. Especies de áfidos que trasmiten el CTV.<\/strong><\/span><\/p>\r\n\r\n\t\t\tFuente: PAF, Cadenas productivas.<\/strong><\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Toxoptera citricida<\/em> = pulgón café<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Toxoptera<\/em> aurantii<\/em> = pulgón negro<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Aphis<\/em> gossypii<\/em> = pulgón amarillo o del algodón<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Aphis<\/em> spiraecola<\/em> = pulgón verde<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n <\/div>\r\n<\/div>\r\n\r\n \r\n \r\n Los pulgones son pequeños y presentan distintas coloraciones (negro, café, amarillo, verde), dependiendo de la especie (Cuadro 1). Existen cuatro especies de pulgones que trasmiten el CTV pero la especie más eficiente en transmitir la enfermedad es el pulgón café de los cítricos Toxoptera citricida<\/em> Kirkaldy. Estos pulgones pierden efectividad de transmitir el virus luego de 48 horas de haberlo adquirido.<\/p>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n \r\n Entre las enfermedades de mayor importancia económica en el cultivo de cítricos se encuentra el virus de la tristeza de los cítricos (CTV en adelante). El CTV se encuentra distribuido en todo el mundo y es considerado como la virosis más importante y devastadora de la citricultura en el mundo, ya que ha producido la muerte de millones de árboles de cítricos.<\/p>\r\n\r\n Sintomatología<\/strong><\/span><\/p>\r\n\r\nLos daños producidos por los pulgones pueden ser directos e indirectos. Los primeros son ocasionados por la absorción de la savia que resta vigor a la planta atacada, además de la inyección de saliva que produce generalmente una reacción fitotóxica, causando la deformación de tallos y ramas, así como el enrollamiento de las hojas. Dentro de los daños indirectos, se puede apreciar una reducción de la tasa fotosintética por el enrollamiento de las hojas, fumagina (Cladosporium citri<\/em>) y la transmisión del virus.<\/p>\r\n\r\nEl CTV es sistémico, ya que daña al floema a nivel del injerto. Los síntomas de la tristeza varían entre variedades e incluso entre una misma variedad, en caso de que esta se desarrolle en diferentes patrones. Los síntomas típicos de esta enfermedad se asocian a un menor vigor de los árboles, a un crecimiento deficiente y al desarrollo de frutos pequeños y deformes. Los principales síntomas son:<\/p>\r\n\r\n Tristeza.<\/strong> Ocurre un decaimiento rápido o lento. Este abatimiento se caracteriza por una clorosis y defoliación del árbol asociado a una severa pudrición de raicillas y a una pérdida de reservas bajo la zona de unión del injerto.<\/p>\r\n<\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Figura 2. Rama de cítrico con acanaladura en la madera inducido por CTV<\/strong><\/span><\/p>\r\n\r\n\t\t\tFoto: Tejada. <\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n \r\n Acanaladuras en la madera.<\/strong> Se caracteriza por la presencia de acanaladuras a nivel del xilema a lo largo del tronco. Estas deformaciones conducen a una pérdida de la productividad en el cultivo de cítricos.<\/p>\r\n\r\nAmarillez de plantas francas de pie o “seedling yellows”.<\/strong> Normalmente ocurre bajo condiciones de invernadero en forma de clorosis intensa.<\/p>\r\n\r\nControl del CTV<\/strong><\/span><\/p>\r\n\r\nMedidas preventivas.<\/strong> Estas tienden a evitar la infección y a reducir la difusión del patógeno. Una medida es el control sanitario del material vegetal propagativo mediante programas de saneamiento, cuarentena y certificación acorde a normativa oficial de cada país. En México, la Norma Oficial NOM-079-FITO-2002 rige la movilidad y producción del material propagativo libre de CTV.<\/p>\r\n\r\nMonitoreo.<\/strong> Dado que no existe un umbral de acción, se recomienda comenzar el control del vector tan pronto se identifique en el cultivo. Para conocer si existe presencia del vector y el nivel de infestación, es necesario emplear trampas para su monitoreo. También los muestreos dirigidos, principalmente a brotes nuevos y en la mitad de la copa del árbol, permiten identificar los daños al follaje, lo cual sirve como indicador para la detección tanto del vector como de la enfermedad.<\/p>\r\n<\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Figura 3. Toxoptera citricida (Pulgon cafe).<\/strong><\/span><\/p>\r\n\r\n\t\t\tFoto: Wray. <\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n \r\n Control Cultural. <\/strong>El control de malezas con el rastreo ayuda a reducir plantas hospederas del áfido. La aspersión de agua sobre el follaje con un volumen de agua de 1000 a 1200 litros\/hectárea, reduce significativamente la densidad del áfido hasta por siete días. Otras medidas de control cultural son la erradicación de plantas infectadas por el CTV, así como el uso de variedades y portainjertos resistentes a CTV (Cuadro 2).<\/p>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n <\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Cuadro 2. Comportamiento de portainjertos frente a CTV.<\/strong><\/span><\/p>\r\n\r\n\t\t\tFuente: Forner, 1979.<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Portainjertos <\/strong><\/p>\r\n\t\t\t<\/td>\r\n\t\t\t\r\n\t\t\t CTV<\/strong><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Naranjo amargo<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Susceptible<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Naranjo dulce<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Tolerante<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Mandarina Cleopatra<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Tolerante<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Poncirus trifoliata <\/em><\/p>\r\n\t\t\t<\/td>\r\n\t\t\t\r\n\t\t\t Tolerante<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Citranges<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Tolerante<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Citrus volkameriana<\/em><\/p>\r\n\t\t\t<\/td>\r\n\t\t\t\r\n\t\t\t Tolerante<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Citrumelo CPB 4475<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Tolerante<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Citrus macrophylla<\/em><\/p>\r\n\t\t\t<\/td>\r\n\t\t\t\r\n\t\t\t Susceptible<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n <\/div>\r\n<\/div>\r\n\r\n \r\n \r\n Control biológico.<\/strong> A nivel mundial, existen al menos 113 especies antagonistas de T. citricida<\/em>. Algunos organismos utilizados para el control biológico de esta plaga son Harmonia axyridis<\/em> (parasitoide),<\/em> así como los hongos Beauveria bassiana<\/em>, Metarhizium anisopliae <\/em>y Paecilomyces fumosoroseus<\/em>. Dentro de los hongos entomopatógenos P<\/em>. fumosoroseus<\/em> alcanza niveles de mortalidad superiores al 90 % en campo, por lo que resulta en una buena alternativa. Otro depredador importante es la crisopa (Chrysoperla carnea<\/em>), la cual provee un control efectivo cuando se realiza una liberación de 12,000 a 61,000 crisopas por hectárea. <\/p>\r\n\r\nControl químico. <\/strong>El control químico va dirigido más que nada al vector, debido a que no hay productos que eliminen el CTV dentro de la planta. Para el control de los áfidos existen insecticidas, lo cuales pueden ser específicos o de amplio espectro para el control de otras plagas. Es necesario que al momento de elegir el ingrediente activo se contemple el grupo toxicológico al que pertenecen para su rotación y evitar generar resistencia en la plaga (Cuadro 3).<\/p>\r\n\r\nFuentes consultadas<\/strong><\/span><\/p>\r\n\r\n-Rodríguez, L. E.; Lomelí, F. J. R. 2013. Pulgón Café de los Cítricos Toxoptera citricida<\/em> (Kirkaldy). SAGARPA-SENASICA. México. 28 p.<\/p>\r\n\r\n-Pedraza, M. R.; Ponce, S. J. L.; Quintanar, A. E. A.; Valdés, M. D.; Villareal, R. G. 2016. Una Amenaza Agrícola Mundial: El Virus de la Tristeza de los Cítricos y su Vector el Pulgón Café Toxoptera citricida<\/em>. Artrópodos y Salud. Vol. 3, N° 1. 30-36 p.<\/p>\r\n\r\n-Ruiz, R. S. 2009. EL Virus de la Tristeza de los Cítricos (CTV): Desarrollo y Aplicación de Herramientas para Establecer un Sistema Genético Eficaz. Tesis Doctoral. Facultad de Ciencias Biológicas. Departamento de Protección Vegetal. Universidad de Valencia. Valencia, España. 245 p.<\/p>\r\n\r\n -Irracheta, C. M. M.; Arrieta, G. L. C. 2012. Detección del Virus Tristeza de los Cítricos Mediante Anticuerpos Contra la Proteína Recombinante p25 de la Cápside Bajo un Sistema de Inmunoimpresión. Revista Mexicana de Fitopatología. Vol. 30, N° 1. 31-42 p.<\/p>\r\n<\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Cuadro 3. Ingredientes activos utilizados para el control de T. citricida<\/em>. <\/strong><\/span><\/p>\r\n\r\n\t\t\tFuente: Elaboración propia<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Ingrediente Activo<\/strong><\/p>\r\n\t\t\t<\/td>\r\n\t\t\t\r\n\t\t\t Grupo Toxicológico<\/strong><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Cipermetrina<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Piretroide<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Malation<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Organofosforado<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Dimetoato<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Organofosforado<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Endosulfan<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Organoclorado<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Imadacloprid<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Neonicotinoide<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t | \r\n\t\t\t\r\n\t\t\t Spinosad<\/p>\r\n\t\t\t<\/td>\r\n\t\t\t | \r\n\t\t\t Insecticida biológico<\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n\r\n \r\n <\/div>\r\n<\/div>\r\n","has_cost":0,"creation":"2016-11-08 16:03:10","updated":"2022-11-18 14:10:22","published":"2016-11-08 18:51:53","cost":0,"badge":"mxn"},"availPoints":0,"articleCosts":[],"conversion":[0.004400000000000000265065747129256124026142060756683349609375,1,5634,19],"guest":true,"countries":[{"country_ID":1,"name":"Argentina","iso2":"ar","badge":"USD","conversion":19},{"country_ID":2,"name":"Belice","iso2":"bz","badge":"USD","conversion":19},{"country_ID":3,"name":"Bolivia","iso2":"bo","badge":"USD","conversion":19},{"country_ID":4,"name":"Canada","iso2":"ca","badge":"USD","conversion":19},{"country_ID":5,"name":"Chile","iso2":"cl","badge":"USD","conversion":19},{"country_ID":6,"name":"Colombia","iso2":"co","badge":"COP","conversion":0.004400000000000000265065747129256124026142060756683349609375},{"country_ID":7,"name":"Costa Rica","iso2":"cr","badge":"USD","conversion":19},{"country_ID":8,"name":"Cuba","iso2":"cu","badge":"USD","conversion":19},{"country_ID":9,"name":"Ecuador","iso2":"ec","badge":"USD","conversion":19},{"country_ID":10,"name":"El Salvador","iso2":"sv","badge":"USD","conversion":19},{"country_ID":11,"name":"Estados Unidos","iso2":"us","badge":"USD","conversion":19},{"country_ID":12,"name":"Guatemala","iso2":"gt","badge":"USD","conversion":19},{"country_ID":13,"name":"Guyana","iso2":"gy","badge":"USD","conversion":19},{"country_ID":14,"name":"Guayana Francesa","iso2":"gf","badge":"USD","conversion":19},{"country_ID":15,"name":"Honduras","iso2":"hn","badge":"USD","conversion":19},{"country_ID":16,"name":"México","iso2":"mx","badge":"MXN","conversion":1},{"country_ID":17,"name":"Nicaragua","iso2":"ni","badge":"USD","conversion":19},{"country_ID":18,"name":"Panamá","iso2":"pa","badge":"USD","conversion":19},{"country_ID":19,"name":"Paraguay","iso2":"py","badge":"USD","conversion":19},{"country_ID":20,"name":"Perú","iso2":"pe","badge":"PEN","conversion":5634},{"country_ID":21,"name":"Puerto Rico","iso2":"pr","badge":"USD","conversion":19},{"country_ID":22,"name":"Rep. 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El CTV es una enfermedad transmitida por insectos conocidos como áfidos o pulgones. Los síntomas típicos de esta enfermedad se asocian a un menor vigor de los árboles, a un crecimiento deficiente, y al desarrollo de frutos pequeños y deformes. En México, la Norma Oficial NOM-079-FITO-2002 rige la movilidad y producción del material propagativo libre de CTV.","fb_desc":"","thumb":"\/assets\/images\/articulos\/categoria1\/Fitosanidad\/art344-virus-tristeza\/Toxoptera%20citricida.jpg","fb_thumb":"","category":8,"related":"","keywords":"virus,toxoptera,citricida,áfido,pulgón,norma,transmisión,material,patógeno,hongos,Beauveria,Paecilomyces,Trichoderma,Harmonia,químico,biológico,portainjero,patrón,variedad,naranja,cítricos,monitoreo,cultivo,umbral,fumagina,vector,clorosis,decaimiento,rotación","pdfLink":"Articulos\/Fitosanidad\/71. Virus de la Tristeza de los Citricos.pdf","text":" \r\n \r\n Entre las enfermedades de mayor importancia económica en el cultivo de cítricos se encuentra el virus de la tristeza de los cítricos (CTV en adelante). El CTV se encuentra distribuido en todo el mundo y es considerado como la virosis más importante y devastadora de la citricultura en el mundo, ya que ha producido la muerte de millones de árboles de cítricos.<\/p>\r\n\r\n Agente causal<\/strong><\/span><\/p>\r\n\r\nEl virus de la tristeza de los cítricos es de la familia Closteroviridae y del género Closterovirus<\/em>. Al igual que los cítricos, es posible que este virus también sea originario de Asia, y que a partir de ahí se dispersó prácticamente en todas las zonas citrícolas a través del intercambio de material propagativo (injertos y portainjertos). La dispersión del CTV a nuevas zonas ocurre fundamentalmente por la propagación de yemas infectadas, mientras que la dispersión secundaria dentro de las plantaciones la efectúan diversas especies de pulgones. Se conocen hasta ahora 3 razas o cepas del virus: 1)<\/strong> Leve o suave<\/strong>, provoca un picado en tallo y amarillamiento del follaje; 2)<\/strong> Moderada<\/strong>, donde tanto ramas como tallos llegan a presentar acanaladuras y 3) Severa o grave<\/strong>, ocasiona un rápido debilitamiento de la planta de la planta, causando su muerte en unas semanas.<\/p>\r\n<\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Figura 1. Infestacion en un brote de naranja por Toxoptera citricida(pulgon marron de citricos). <\/strong><\/span><\/p>\r\n\r\n\t\t\tFoto: Lomeli y Valdez. <\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/div>\r\n\r\n\r\n \r\n Vector del CTV<\/strong><\/span><\/p>\r\n\r\nEl CTV es una enfermedad transmitida por insectos conocidos como áfidos o pulgones. La transmisión por pulgones ocurre de forma semi-persistente, ya que el virus puede ser adquirido y trasmitido por los pulgones en cuestión de segundos. La eficiencia de la transmisión depende de la especie del pulgón transmisor, la cepa del virus, el portainjerto y variedad, además de las condiciones ambientales.<\/p>\r\n<\/div>\r\n<\/div>\r\n\r\n \r\n <\/div>\r\n\r\n \r\n \r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t Cuadro 1. Especies de áfidos que trasmiten el CTV.<\/strong><\/span><\/p>\r\n\r\n\t\t\tFuente: PAF, Cadenas productivas.<\/strong><\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Toxoptera citricida<\/em> = pulgón café<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Toxoptera<\/em> aurantii<\/em> = pulgón negro<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Aphis<\/em> gossypii<\/em> = pulgón amarillo o del algodón<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t\t\r\n\t\t\t\r\n\t\t\t Aphis<\/em> spiraecola<\/em> = pulgón verde<\/span><\/p>\r\n\t\t\t<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n <\/div>\r\n<\/div>\r\n\r\n | | | | | | | | | | | | | | | | | | | | | | | | |