<?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>1390-7697</journal-id>
<journal-title><![CDATA[Revista Científica y Tecnológica UPSE (RCTU)]]></journal-title>
<abbrev-journal-title><![CDATA[RCTU]]></abbrev-journal-title>
<issn>1390-7697</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal Península de Santa Elena]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1390-76972022000200010</article-id>
<article-id pub-id-type="doi">10.26423/rctu.v9i1.645</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la densidad y tiempo de liberación de Trichogramma sp sobre Spodoptera frugiperda en el cultivo de maíz en la comuna San Marcos]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of the density and release time of Trichogramma sp on Spodopterafrugiperda in the corn crop in the San Marcos community]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beltrán Gomez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega Maldonado]]></surname>
<given-names><![CDATA[Lourdes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santistevan Méndez]]></surname>
<given-names><![CDATA[Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quevedo Pinos]]></surname>
<given-names><![CDATA[Nadia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Estatal Península de Santa Elena, UPSE  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>9</volume>
<numero>1</numero>
<fpage>10</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S1390-76972022000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S1390-76972022000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S1390-76972022000200010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El uso de enemigos naturales para el control de insectos plaga como Spodoptera frugiperda en el cultivo de maíz constituye una alternativa viable que reduce considerablemente el impacto ambiental de la agricultura moderna, caracterizada por el uso de agrotóxicos. El objetivo del presente trabajo fue evaluar la eficiencia de Trichogramma sp en el control de Spodoptera frugiperda en el cultivo de maíz. El experimento se instaló en la comuna San Marcos, en el cultivo de maíz híbrido Hércules; se estableció un diseño experimental completamente al azar con arreglo bifactorial 2x3, donde un factor fue la densidad del parasitoide (100 000 ind&#8729;ha  -1 (D1)) y 200 000 ind&#8729;ha  -1 (D2)) y el segundo factor, tres tiempos de liberación (TL) 30, 45 y 60 días después de la germinación (DDG), con cuatro repeticiones. Los datos fueron analizados en el programa estadístico SISVAR, las medias comparadas utilizando el test de Tukey con un 95% de confianza. Se evaluó incidencias (I), grado de afectación por cogollero (GAC) y masa de huevos parasitados (M H P). Los resultados demuestran que el tiempo de liberación afecta directamente a las variables I y GAC, mientras que la variable MHP se relaciona con el tiempo de liberación y la densidad. Entre las tres variables estudiadas sobresale la liberación temprana se intensifica a mayores densidades del parasitoide.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The use of natural enemies to control insect pests such as Spodoptera frugiperda in corn crop is a viable alternative which considerably reduces the negative environmental impact of modern agriculture, characterized by the extensive use of agrochemicals. The objective of this study was to evaluate the efficiency of Trichogramma sp in the control of Spodoptera frugiperda in corn crops. The experiment was installed in the San Marcos commune in the Hércules hybrid maize crop, an experimental design was established in completely randomized blocks with a 2x3 bifactorial arrangement, where one factor was the density of the parasitoid (100 000 ind&#8729;ha  -1 (D1)) and 200 000 ind&#8729;ha  -1 (D2)) and the second the release times (LT) 30, 45 and 60 days after germination (DDG), with four repetitions. The data obtained were analyzed by the statistical program SISVAR, the means compared by Tukey&#8217;s test with 95% confidence. Among the variables to be evaluated, the percentage of plants affected (PPA), degree of affectation by armyworm (GAC) and mass of parasitized eggs (M H P) were considered. The results obtained show that the release time directly affects the PPA and GAC variables. While the M H P variable is related to the release time and type of concentration. In the three variables studied, early release always stands out and the effect is intensified when accompanied by higher densities]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cogollero]]></kwd>
<kwd lng="es"><![CDATA[control biológico]]></kwd>
<kwd lng="es"><![CDATA[manejo integrado de plagas]]></kwd>
<kwd lng="es"><![CDATA[parasitoide]]></kwd>
<kwd lng="en"><![CDATA[armyworm]]></kwd>
<kwd lng="en"><![CDATA[biological control]]></kwd>
<kwd lng="en"><![CDATA[integrated pest management]]></kwd>
<kwd lng="en"><![CDATA[parasitoid]]></kwd>
</kwd-group>
</article-meta>
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