<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0304-2847</journal-id>
<journal-title><![CDATA[Revista Facultad Nacional de Agronomía Medellín]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Nac. Agron. Medellín]]></abbrev-journal-title>
<issn>0304-2847</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias - Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0304-28472020000109065</article-id>
<article-id pub-id-type="doi">10.15446/rfnam.v73n1.78824</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Economic injury level and action thresholds for Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in maize crops]]></article-title>
<article-title xml:lang="es"><![CDATA[Nivel de daño económico y umbrales de acción para Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) en cultivos de maíz]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jaramillo-Barrios]]></surname>
<given-names><![CDATA[Camilo Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varón-Devia]]></surname>
<given-names><![CDATA[Edgar Herney]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monje-Andrade]]></surname>
<given-names><![CDATA[Buenaventura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria  ]]></institution>
<addr-line><![CDATA[Tolima ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2020</year>
</pub-date>
<volume>73</volume>
<numero>1</numero>
<fpage>9065</fpage>
<lpage>9076</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0304-28472020000109065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0304-28472020000109065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0304-28472020000109065&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Spodoptera frugiperda (J.E. Smith) is the pest insect that produces the highest losses in maize production in the tropics and neotropics. Its control in Colombia comprises about 10% of the total production costs. The aim of this study was to determine the economic injury level (EIL) and define action thresholds (ATs) for this insect pest in the maize hybrids 30F35R and 30F35HR (with Cry1F protein) in Espinal, Colombia. In two sowing cycles, a completely randomized design was established for each maize hybrid to measure their yield response at four insect population levels (a control without any applications of insecticides and applications at 2, 5, and 10 larvae per 10 plants). For 30F35R, an inverse relationship was found between levels of infestation and yields; meanwhile, for 30F35HR, only during the first cycle this relationship was found. The EIL calculated for 30F35R showed an average of 2.6 and 1.9 larvae per 10 plants in the first and second cycles, respectively, and 2.8 for 30F35HR in the first cycle. Two ATs were established, one in the period from 0 to 20 days after emergence (DAE) and another from 20 to 40 DAE. The threshold for 30F35R from 0 to 20 DAE showed an average of 1.8 larvae per 10 plants in both cycles, while, from 20 to 40 DAE, it was 2.0 and 1.7 in the first and second cycles, respectively. In 30F35HR, the thresholds were 2.1 and 2.5 larvae per 10 plants on average for both periods of the first cycle, respectively. These results can be considered as a tool within integrated pest management that also includes biological and cultural control strategies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Spodoptera frugiperda (J.E. Smith) es el insecto plaga que produce las mayores pérdidas en la producción de maíz en el trópico y neotrópico. Su control en Colombia comprende cerca del 10% de los costos de producción. El objetivo de este estudio fue determinar el nivel de daño económico (NDE) y definir umbrales de acción (UA) en los híbridos 30F35R y 30F35HR (con proteína Cry1F) en Espinal, Tolima, Colombia, para este insecto plaga. En dos ciclos de siembra, se estableció un diseño completamente al azar para cada híbrido, para medir la respuesta del rendimiento de maíz a cuatro niveles poblacionales del insecto (un control sin aplicación de insecticida, y aplicaciones a poblaciones de 2, 5 y 10 larvas por 10 plantas). Para 30F35R, se encontró una relación inversa entre los niveles de infestación y los rendimientos en los dos ciclos, mientras que para 30F35HR, sólo se encontró en el primero. Los NDE calculados en 30F35R fueron 2,6 y 1,9 larvas promedio por 10 plantas en el primer y segundo ciclo, respectivamente, y 2,8 en 30F35HR en el primer ciclo. Se determinaron dos UA, uno en el período de 0-20 días después de emergencia (DDE), y otro de 20-40 DDE. El umbral en 30F35R de 0-20 DDE, fue de 1,8 larvas promedio por 10 plantas en ambos ciclos, mientras que de 20-40 DDE fue de 2,0 y 1,7 en el primer y segundo ciclo, respectivamente. En 30F35HR los umbrales fueron de 2,1 y 2,5 larvas promedio por 10 plantas para ambos períodos del primer ciclo, respectivamente. Estos resultados pueden ser considerados como una herramienta dentro de un manejo integrado de plagas que además incluya estrategias de control biológico y culturales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cry1F protein]]></kwd>
<kwd lng="en"><![CDATA[Fall armyworm]]></kwd>
<kwd lng="en"><![CDATA[Genetically modified organisms]]></kwd>
<kwd lng="en"><![CDATA[Zea mays]]></kwd>
<kwd lng="es"><![CDATA[Proteína Cry1F]]></kwd>
<kwd lng="es"><![CDATA[Gusano cogollero]]></kwd>
<kwd lng="es"><![CDATA[Organismos genéticamente modificados]]></kwd>
<kwd lng="es"><![CDATA[Zea mays]]></kwd>
</kwd-group>
</article-meta>
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