<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442020000100276</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v68i1.37680</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores edáficos y nemátodos entomopatógenos en un agroecosistema neotropical de banano]]></article-title>
<article-title xml:lang="en"><![CDATA[Edaphic factors and entomopathogenic nematodes in a neotropical banana agroecosystem]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vidaurre]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uribe]]></surname>
<given-names><![CDATA[Lidieth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Liga Agrícola Industrial de la Caña de Azúcar Departamento de Investigación y Extensión de la Caña de Azúcar ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>68</volume>
<numero>1</numero>
<fpage>276</fpage>
<lpage>288</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442020000100276&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442020000100276&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442020000100276&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  En Costa Rica el banano es uno de los cultivos más importantes en términos de producción y exportaciones, que requiere la aplicación de agroquímicos para controlar el efecto de plagas como el picudo negro, Cosmopolites sordidus. Debido a los efectos dañinos en la salud humana y ambiental, y la posibilidad de que las plagas presenten resistencia a estas sustancias, es necesario investigar alternativas amigables con el medio ambiente como potenciales controladores biológicos. Los nemátodos entomopatógenos (NEPs) de los géneros Heterorhabditis y Steinernema presentan una relación simbiótica con bacterias de los géneros Photorhabdus y Xenorhabdus respectivamente y este complejo ha sido ampliamente estudiado como controlador biológico debido a su capacidad de eliminar insectos hospederos en horas.  Objetivo: Determinar la presencia de nemátodos de los géneros Heterorhabditis y Steinernema en suelos de plantaciones de banano del Caribe costarricense y zonas aledañas y caracterizar su hábitat.  Metodología:  Se tomaron muestras de suelo en plantaciones y áreas circundantes, a partir de las cuales, se llevó cabo aislamiento de NEPs y análisis químicos, físicos y microbiológicos (pH, acidez, materia orgánica, Ca, K, Mg, P, Fe, Cu, Zn, Mn, textura del suelo, biomasa y respiración microbiana). Se encontraron diferencias entre sitios de muestreo, y muestras con presencia y ausencia de NEPs, y se realizó un análisis de componentes principales utilizando las variables con mayor influencia en ambas categorías para encontrar combinaciones de las mismas que explicaran la presencia según condiciones del hábitat. Se efectuó un análisis discriminante para determinar la eficiencia de las variables seleccionadas en el diagnóstico de presencia.  Resultados: Se mostró que las variables relacionadas con la presencia de NEPs corresponden a materia orgánica, biomasa microbiana de carbono y respiración microbiana. Se encontró que el 38.4 % de las muestras fueron positivas con respecto a la presencia de los mismos, de las cuales el 95 % corresponde al género Steinernema y el 5 % restante a Heterorhabditis. Según la ecuación discriminante cuadrática, de un 81.2 % de las muestras sin nemátodos, seis deberían pertenecer al grupo con presencia de los mismos; mientras que para aquellas que contenían NEPs, un 55.0 % (nueve de 20) al grupo de ausencia.  Conclusiones: No se observaron diferencias estadísticas entre los hábitats de muestreo seleccionados (P = 0.4296), por lo que se determinó que las tres variables mencionadas anteriormente influyen en la presencia de NEPs y valores altos indican condiciones favorables para su persistencia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: In Costa Rica the banana is one of the most important crops in terms of production and exports; the application of pesticides is hence necessary to control the effect of pests on the plantation, such as the Cosmopolites sordidus black weevil. Because of the harmful effects of pesticides on human and environmental health, and the possibility that pests become resistant to these substances, alternatives compatible with the environment, as potential biological controllers, have been investigated to complement the effect of agrochemicals. The entomopathogenic nematodes (EPN) of genera Heterorhabditis and Steinernema have become a focus of study in the field of biological control because of their symbiotic relation with bacteria of genera Photorhabdus and Xenorhabdus, which are a complex capable of eliminating host insects in hours.  Objective: The objective was to determine the presence of EPN of genera Heterorhabditis and Steinernema in soil samples taken from banana plantations in the Caribbean region of Costa Rica, and to characterize their habitat. }  Methods:  Sampling points were selected within the plantations and surrounding areas; physicochemical and microbiological analyses were undertaken (pH, acidity, organic matter, Ca, K, Mg, P, Fe, Cu, Zn, Mn, texture, biomass and microbial respiration of the soil, EPN isolation). Variables were analyzed statistically to determine differences between them, in sampling sites, and samples with presence and absence of EPN. A principal-component analysis (PCA) was undertaken using the variables of greater influence in both categories to find their combinations that would explain their presence according to habitat conditions. A discriminant analysis was undertaken to determine the efficiency of the variables selected in the diagnosis of nematode occurrence.  Results: The variables related to the presence of EPN were shown to correspond to organic matter, carbon biomass and microbial respiration. Of the samples 38.4 % were found to be positive with respect to the presence of EPN, of which 95 % correspond to genus Steinernema and the remaining 5 % to Heterorhabditis. According to the quadratic discriminant equation, from 81.2 % of the samples without nematodes, six belong to the group with their presence, whereas for those with EPN, 55.0 % (nine of 20) belong to the absence group.  Conclusions: No statistical difference was found between the selected sampling habitats (P= 0.4296); the three variables mentioned above were thus determined have an influence on the presence of EPN; their large values indicate favorable conditions for their persistence.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[banano]]></kwd>
<kwd lng="en"><![CDATA[Steinernema]]></kwd>
<kwd lng="en"><![CDATA[Heterorhabditis]]></kwd>
<kwd lng="en"><![CDATA[Cosmopolites sordidus]]></kwd>
<kwd lng="es"><![CDATA[banana]]></kwd>
<kwd lng="es"><![CDATA[Steinernema]]></kwd>
<kwd lng="es"><![CDATA[Heterorhabditis]]></kwd>
<kwd lng="es"><![CDATA[Cosmopolites sordidus]]></kwd>
</kwd-group>
</article-meta>
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