<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212022000300021</article-id>
<article-id pub-id-type="doi">10.15517/am.v33i3.48568</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Eficacia de herbicidas posemergentes sobre Oryza latifolia Desv. (arroz pato) y selectividad al arroz Palmar 18]]></article-title>
<article-title xml:lang="en"><![CDATA[Efficacy of post-emergent herbicides on Oryza latifolia Desv. (broadleaf rice) and selectivity to Palmar 18 rice]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Picado-Arroyo]]></surname>
<given-names><![CDATA[Grettel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Murillo]]></surname>
<given-names><![CDATA[Franklin]]></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[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212022000300021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212022000300021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212022000300021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Oryza latifolia Desv. es una maleza problemática en plantaciones de arroz, dada la competencia que ejerce y la limitada disponibilidad de herbicidas para su control, que sean selectivos a variedades de arroz convencional. Objetivo. Identificar herbicidas posemergentes eficaces contra O. latifolia y selectivos a la variedad de arroz Palmar 18 (Oryza sativa L.). Materiales y métodos. De abril a noviembre del 2019 en la Estación Experimental Agrícola Fabio Baudrit Moreno, Alajuela, Costa Rica, se realizaron dos experimentos en macetas bajo condiciones de invernadero; en el primero se evaluaron los herbicidas fenoxaprop-p-etil 50, 70, 90 g i.a. ha-1, setoxidim 125, 225, 325 g i.a. ha-1 y profoxidim 150, 200, 250 g i.a. ha-1, aplicados sobre plantas de O. latifolia de dos a tres hojas. Se utilizó un diseño experimental irrestricto al azar con diez tratamientos (se incluyó un testigo sin herbicida) y cinco repeticiones. En el segundo experimento, se evaluó la selectividad de fenoxaprop-p-etil 50 g i.a. ha-1, setoxidim 125 g i.a. ha-1 y profoxidim 150 g i.a. ha-1, a la variedad convencional Palmar 18 en 2-3 y 4-5 hojas. Se utilizó un diseño irrestricto al azar con arreglo factorial 3x2 (tres herbicidas y dos estados de desarrollo), dos testigos sin herbicidas y seis repeticiones. Resultados. Todos los herbicidas en las dosis evaluadas controlaron entre 96 y 100 % a O. latifolia. Los herbicidas profoxidim y setoxidim mostraron ser selectivos al arroz Palmar 18, bajo las condiciones en que se realizó la investigación, no así el fenoxaprop-p-etil que causó daños severos en las plantas de arroz Palmar 18. Conclusión. Profoxidim 150 g i.a. ha-1 y setoxidim 125 g i.a. ha-1 fueron eficaces contra O. latifolia y solo causaron daños leves temporales a la variedad de arroz Palmar 18.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. Oryza latifolia Desv. is a problematic weed in rice plantations given the competition it exerts and the limited availability of herbicides for its control, which are selective to conventional rice varieties. Objective. To identify post-emergent herbicides effective against O. latifolia and selective to the Palmar 18 rice (Oryza sativa L.) variety. Materials and methods. From April to November 2019 at the Fabio Baudrit Moreno Agricultural Experimental Station, Alajuela, Costa Rica, two experiments were carried out in pots and under greenhouse conditions; in the first one, the herbicides fenoxaprop-p-ethyl 50, 70, 90 g a.i. ha-1, sethoxydim 125, 225, 325 g a.i. ha-1, and profoxydim 150, 200, 250 g a.i. ha-1, applied on O. latifolia plants with two to three leaves, were evaluated. An unrestricted randomized experimental design with ten treatments (a control without herbicide was included), and five replications was used. In the second experiment, the selectivity of fenoxaprop-p-ethyl 50 g a.i. ha-1, sethoxydim 125 g a.i. ha-1, and profoxydim 150 g a.i. ha-1, was evaluated on the conventional variety Palmar 18 in 2-3 and 4-5 leaves. An unrestricted randomized design was used with a 3x2 factorial arrangement (three herbicides and two stages of development), two controls without herbicides and six replications. Results. All herbicides at the doses evaluated controlled between 96 and 100 % of O. latifolia. The herbicides profoxydim and sethoxydim showed to be selective to Palmar 18 rice, under the conditions in which the research was carried out, but not fenoxaprop, which caused severe damage to Palmar 18 rice plants. Conclusion. Profoxydim 150 g a.i. ha-1 and sethoxydim 125 g a.i. ha-1 were effective against O. latifolia and only caused slight temporary damage to the Palmar 18 rice variety.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[malezas]]></kwd>
<kwd lng="es"><![CDATA[selectividad]]></kwd>
<kwd lng="es"><![CDATA[fitotoxicidad]]></kwd>
<kwd lng="es"><![CDATA[estados fenológicos]]></kwd>
<kwd lng="es"><![CDATA[variedad]]></kwd>
<kwd lng="en"><![CDATA[weeds]]></kwd>
<kwd lng="en"><![CDATA[selectivity]]></kwd>
<kwd lng="en"><![CDATA[phytotoxicity]]></kwd>
<kwd lng="en"><![CDATA[phenological stages]]></kwd>
<kwd lng="en"><![CDATA[variety]]></kwd>
</kwd-group>
</article-meta>
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