<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242020000100113</article-id>
<article-id pub-id-type="doi">10.15517/rac.v44i1.40017</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Brote de oligonychus yothersi en cafetales de Costa Rica por la ceniza del Volcán Poás durante el año 2017]]></article-title>
<article-title xml:lang="en"><![CDATA[Outbreak of Oligonychus yothersi in coffee plantations of Costa Rica by ash of the Poás Volcano during the year 2017]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Barrantes]]></surname>
<given-names><![CDATA[Mainor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Valerio]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Constantino-Chuaire]]></surname>
<given-names><![CDATA[Luis Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto del Café de Costa Rica (ICAFE)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto del Café de Costa Rica (ICAFE),  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Nacional de Investigaciones de Café (CENICAFE),  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>44</volume>
<numero>1</numero>
<fpage>113</fpage>
<lpage>122</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242020000100113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242020000100113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242020000100113&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La arañita roja (Oligonychus yothersi) ha sido catalogada como una plaga de poca importancia en los cafetales de Costa Rica, lo cual afecta levemente solo en la época seca en los bordes del cultivo. El único ataque fuerte de O. yothersi se reportó entre 1963 y 1965 en el Valle Central, relacionado con la caída de ceniza del volcán Irazú. Durante el año 2017 el volcán Poás lanzó cantidades importantes de ceniza que fueron llevadas por el viento en dirección suroeste y se relacionó con un fuerte ataque de arañita roja entre noviembre de 2017 y marzo de 2018, en un área de 4155 ha ubicadas sobre 1200 m de altura entre los cantones de Poás y Naranjo de Alajuela. La población decreció por efectos del combate biológico natural lo cual se relaciona con una población abundante de 5 especies de depredadores. Se evaluó el control con acaricidas químicos con buenos resultados al aplicar productos a base de propargite y azufre.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The red spider mite (Oligonychus yothersi) has been classified as a minor pest in coffee plantations in Costa Rica, affecting only slightly in the dry season at the edges of the crop. The only strong attack of O. yothersi was reported between 1963 and 1965 in the Central Valley, related to the fall of ash from the Irazú volcano. During the year 2017, the Poás volcano released significant amounts of ash that were carried by the wind in a southwest direction and was related to a strong attack of the red spider mite between November 2017 and March 2018, in an area of 4155 hectares located over 1200 m above sea level between Poás and Naranjo. The population decreased by the effect of natural biological control related to abundant population of 5 species of predators. The chemical control with acaricides was evaluated with good results when applying products based on propargite and sulfur.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Coffea arabica]]></kwd>
<kwd lng="es"><![CDATA[arañita roja]]></kwd>
<kwd lng="es"><![CDATA[Oligonychus yothersi]]></kwd>
<kwd lng="es"><![CDATA[ceniza volcánica]]></kwd>
<kwd lng="es"><![CDATA[control biológico]]></kwd>
<kwd lng="en"><![CDATA[Coffea arabica]]></kwd>
<kwd lng="en"><![CDATA[red spider mite]]></kwd>
<kwd lng="en"><![CDATA[Oligonychus yothersi]]></kwd>
<kwd lng="en"><![CDATA[volcanic ash]]></kwd>
<kwd lng="en"><![CDATA[biological control]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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