<?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>S1659-13212021000300991</article-id>
<article-id pub-id-type="doi">10.15517/am.v32i3.41394</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Actividad herbicida de tres productos naturales sobre cuatro especies de arvenses]]></article-title>
<article-title xml:lang="en"><![CDATA[Herbicidal activity of three natural products on four weed species]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portuguez-García]]></surname>
<given-names><![CDATA[Mary Pamela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agüero-Alvarado]]></surname>
<given-names><![CDATA[Renán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Lutz]]></surname>
<given-names><![CDATA[María Isabel]]></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>
<aff id="Af3">
<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>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>32</volume>
<numero>3</numero>
<fpage>991</fpage>
<lpage>999</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212021000300991&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212021000300991&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212021000300991&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Ciertas sustancias de origen natural pueden tener actividad herbicida sobre algunas especies de arvenses. Objetivo. Evaluar la eficacia de tres sustancias de origen natural para el control de cuatro especies de arvenses y compararla con el efecto de un herbicida sintético de amplio espectro. Materiales y métodos. En febrero del 2017 se condujo un experimento en un invernadero en la Estación Experimental Agrícola Fabio Baudrit Moreno, de la Universidad de Costa Rica. Se evaluaron tres productos comerciales de origen natural a base de: d-limoneno al 55 %, extracto de pino al 15 % (Pinus sp.) y extracto de tomillo al 23 % (Thymus vulgaris); además, se evaluó un producto de origen sintético, glufosinato de amonio 14 SL. Se incluyó un testigo absoluto. Estos se asperjaron sobre plantas de Bidens pilosa, Amaranthus sp., Echinochloa colona y Rottboellia cochinchinensis. Resultados. Las plantas asperjadas con los herbicidas naturales mostraron síntomas a las dos horas, pero su eficacia final varió entre especies. A los ocho días después de la aspersión el d-limoneno resultó más eficaz que todos los demás tratamientos, mostró grados de daño mayores a 4,25 en todas las especies. Con el extracto de pino y el extracto de tomillo no se obtuvo eficacia sobre B. pilosa. El extracto de pino causó mayores daños en Amaranthus sp, E. colona y R. cochinchinensis, mientras que el extracto de tomillo en Amaranthus sp y R. cochinchinensis. El herbicida sintético glufosinato mostró daños significativos en las cuatro especies. Conclusiones. Los productos comerciales de origen natural utilizados, tuvieron actividad herbicida sobre las cuatro especies de arvenses evaluadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. Certain naturally derived substances may have herbicidal activity on some weeds species. Objective. To evaluate the efficacy of three substances of natural origin for the control of four weed species and to compare it with the effect of a synthetic broad-spectrum herbicide. Materials and methods. In February 2017, an experiment was conducted in a greenhouse at the Fabio Baudrit Moreno Agricultural Experiment Station, Universidad de Costa Rica. Three commercial products of natural origin based on: 55 % d-limonene, 15% pine extract (Pinus sp.) and 23% thyme extract (Thymus vulgaris) were evaluated; additionally, a product of synthetic origin, gluphosinate ammonium 14 SL, was evaluated. A none treated check was included. These were sprayed on seedlings of Bidens pilosa, Amaranthus sp., Echinochloa colona and Rottboellia cochinchinensis. Results. The seedlings sprayed with the natural herbicides showed symptoms at two hours, but their final efficacy varied among species. Eight-days after spraying, d-limonene was more effective than all other treatments, showing damage ratings higher than 4.25 in all species. Pine and thyme extracts were not effective on B. pilosa. Pine extract caused greater damage on Amaranthus sp, E. colona, and R. cochinchinensis, while the thyme extract caused greater damage on Amaranthus sp and R. cochinchinensis. The synthetic herbicide gluphosinate showed significant damage on all four species. Conclusions. The commercial products of natural origin used had herbicidal activity on the four weed species tested.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[herbicidas naturales]]></kwd>
<kwd lng="es"><![CDATA[glufosinato]]></kwd>
<kwd lng="es"><![CDATA[d-limoneno]]></kwd>
<kwd lng="es"><![CDATA[extracto de pino]]></kwd>
<kwd lng="es"><![CDATA[extracto de tomillo]]></kwd>
<kwd lng="en"><![CDATA[natural herbicides]]></kwd>
<kwd lng="en"><![CDATA[glufosinate]]></kwd>
<kwd lng="en"><![CDATA[d-limonene]]></kwd>
<kwd lng="en"><![CDATA[pine extract]]></kwd>
<kwd lng="en"><![CDATA[thyme extract]]></kwd>
</kwd-group>
</article-meta>
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