<?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>0065-1737</journal-id>
<journal-title><![CDATA[Acta zoológica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Zool. Mex]]></abbrev-journal-title>
<issn>0065-1737</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0065-17372010000500028</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Propiedades bioplaguicidas del vermicompost]]></article-title>
<article-title xml:lang="en"><![CDATA[Bio-pesticide properties of vermicompost]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[DOMÍNGUEZ]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GÓMEZ-BRANDÓN]]></surname>
<given-names><![CDATA[María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[LAZCANO]]></surname>
<given-names><![CDATA[Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Vigo Departamento de Ecología y Biología Animal ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2010</year>
</pub-date>
<volume>26</volume>
<numero>spe2</numero>
<fpage>373</fpage>
<lpage>383</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0065-17372010000500028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0065-17372010000500028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0065-17372010000500028&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[A pesar de la abundante información sobre las propiedades bioplaguicidas de algunos fertilizantes orgánicos como el compost, existen muy pocos trabajos acerca de este tipo de propiedades en el vermicompost. Recientemente se ha investigado el potencial del vermicompost como bioplaguicida contra patógenos vegetales, insectos, ácaros y nematodos parásitos de plantas. La adición de vermicom-post al suelo incrementa la diversidad microbiana del mismo y por lo tanto hay un rango más amplio de microorganismos que pueden actuar como agentes biocontrol contra diferentes plagas para las plantas. Además, el vermicompost constituye una fuente de nutrientes de liberación lenta, que se van poniendo a disposición de la planta a medida que ésta los va necesitando, y su aplicación puede aumentar la producción de compuestos fenólicos en la misma, haciéndola más resistente a la herbivoría. Aunque existen evidencias científicas del papel del vermicompost como bioplaguicida, es necesario esclarecer qué factores desencadenan esta supresión y en qué medida éstos dependen del material de origen, de la especie de lombriz de tierra y del proceso de vermicompostaje.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Despite the extensive literature on the suppression of pests by some organic fertilizers like compost, there are very few studies related to the control of pests by vermicompost. Recently, the potential of vermicompost in the suppression of plant pathogens, insects, mites and plant parasitic nematodes has been investigated. The addition of vermicompost to soils increases microbial diversity, providing a wider range of microorganisms that can act as biocontrol agents against different plant plagues. Furthermore, vermicompost is a slow releasing nutrient source providing nutrients in synchrony with plant needs, and its application can increase the production of phenolic compounds in plants, making them more resistant to herbivory. Although, there is scientific evidence of the role of vermicompost in the suppression of pests, it is necessary to clarify which factors trigger this suppression and to what extent these are dependent on the source of the material, on the species of earthworm and the vermicom-posting process.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Control biológico]]></kwd>
<kwd lng="es"><![CDATA[fitosanidad]]></kwd>
<kwd lng="es"><![CDATA[enmiendas orgánicas]]></kwd>
<kwd lng="es"><![CDATA[fitopatógenos]]></kwd>
<kwd lng="es"><![CDATA[lombrices de tierra]]></kwd>
<kwd lng="en"><![CDATA[Biological control]]></kwd>
<kwd lng="en"><![CDATA[plant health]]></kwd>
<kwd lng="en"><![CDATA[organic amendments]]></kwd>
<kwd lng="en"><![CDATA[plant pathogens]]></kwd>
<kwd lng="en"><![CDATA[earthworms]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culos originales</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Propiedades bioplaguicidas del vermicompost</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Bio&#150;pesticide properties of vermicompost</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Jorge DOM&Iacute;NGUEZ, Mar&iacute;a G&Oacute;MEZ&#150;BRAND&Oacute;N &amp; Cristina LAZCANO</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Departamento de Ecolog&iacute;a y Biolog&iacute;a Animal. Universidad de Vigo. Vigo E&#150;36310, Espa&ntilde;a. E&#150;mail:</i> <a href="mailto:jdguez@uvigo.es">jdguez@uvigo.es</a>, <a href="mailto:mariagomez@uvigo.es">mariagomez@uvigo.es</a>, <a href="mailto:cristina@uvigo.es">cristina@uvigo.es</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido: 16/05/2008.    <br> Aceptado: 08/01/2010.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">A pesar de la abundante informaci&oacute;n sobre las propiedades bioplaguicidas de algunos fertilizantes org&aacute;nicos como el compost, existen muy pocos trabajos acerca de este tipo de propiedades en el vermicompost. Recientemente se ha investigado el potencial del vermicompost como bioplaguicida contra pat&oacute;genos vegetales, insectos, &aacute;caros y nematodos par&aacute;sitos de plantas. La adici&oacute;n de vermicom&#150;post al suelo incrementa la diversidad microbiana del mismo y por lo tanto hay un rango m&aacute;s amplio de microorganismos que pueden actuar como agentes biocontrol contra diferentes plagas para las plantas. Adem&aacute;s, el vermicompost constituye una fuente de nutrientes de liberaci&oacute;n lenta, que se van poniendo a disposici&oacute;n de la planta a medida que &eacute;sta los va necesitando, y su aplicaci&oacute;n puede aumentar la producci&oacute;n de compuestos fen&oacute;licos en la misma, haci&eacute;ndola m&aacute;s resistente a la herbivor&iacute;a. Aunque existen evidencias cient&iacute;ficas del papel del vermicompost como bioplaguicida, es necesario esclarecer qu&eacute; factores desencadenan esta supresi&oacute;n y en qu&eacute; medida &eacute;stos dependen del material de origen, de la especie de lombriz de tierra y del proceso de vermicompostaje.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Control biol&oacute;gico, fitosanidad, enmiendas org&aacute;nicas, fitopat&oacute;genos, lombrices de tierra.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>     <p align="justify"><font face="verdana" size="2">Despite the extensive literature on the suppression of pests by some organic fertilizers like compost, there are very few studies related to the control of pests by vermicompost. Recently, the potential of vermicompost in the suppression of plant pathogens, insects, mites and plant parasitic nematodes has been investigated. The addition of vermicompost to soils increases microbial diversity, providing a wider range of microorganisms that can act as biocontrol agents against different plant plagues. Furthermore, vermicompost is a slow releasing nutrient source providing nutrients in synchrony with plant needs, and its application can increase the production of phenolic compounds in plants, making them more resistant to herbivory. Although, there is scientific evidence of the role of vermicompost in the suppression of pests, it is necessary to clarify which factors trigger this suppression and to what extent these are dependent on the source of the material, on the species of earthworm and the vermicom&#150;posting process.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Biological control, plant health, organic amendments, plant pathogens, earthworms.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">El compost y el vermicompost son dos tipos de fertilizantes org&aacute;nicos con una efectividad, en muchos casos, superior a la de otros abonos org&aacute;nicos como los esti&eacute;rcoles naturales. En los &uacute;ltimos a&ntilde;os se ha reforzado el estudio de los efectos de la aplicaci&oacute;n de los mismos en las propiedades f&iacute;sicas, qu&iacute;micas y biol&oacute;gicas del suelo. En estudios a largo plazo, se ha demostrado que su adici&oacute;n produce una disminuci&oacute;n significativa de la densidad aparente, un aumento de la estabilidad de los agregados y de la capacidad de retenci&oacute;n de agua del suelo (Albiach <i>et al. </i>2001, Ferreras <i>et al. </i>2006, Weber <i>et al. </i>2007), as&iacute; como un incremento de la concentraci&oacute;n de carbono org&aacute;nico y de las cantidades totales de nutrientes esenciales para las plantas en comparaci&oacute;n con los fertilizantes minerales (Garc&iacute;a&#150;Gil <i>et al. </i>2000, Bulluck <i>et al. </i>2002, Chaoui <i>et al. </i>2003, Nardi <i>et al. </i>2004, Weber <i>et al. </i>2007). La adici&oacute;n de estos fertilizantes org&aacute;nicos al suelo incrementa adem&aacute;s la concentraci&oacute;n de sustancias h&uacute;micas de estructura molecular compleja, aumentando por lo tanto la relaci&oacute;n &aacute;cidos h&uacute;micos/&aacute;cidos f&uacute;lvicos (Albiach <i>et al. </i>2001, Nardi <i>et al. </i>2004, Weber <i>et al. </i>2007).</font></p>     <p align="justify"><font face="verdana" size="2">Adem&aacute;s de modificar las propiedades qu&iacute;micas, la adici&oacute;n de fertilizantes org&aacute;nicos produce tambi&eacute;n cambios en las propiedades biol&oacute;gicas del suelo, aumentando la biomasa y la actividad microbiana y modificando distintas actividades enzim&aacute;ticas (Benitez <i>et al. </i>2000, Garc&iacute;a&#150;Gil <i>et al. </i>2000, Arancon <i>et al. </i>2005, Ros <i>et al. </i>2006) y la estructura misma de las comunidades microbianas (Ros <i>et al. </i>2006). Bulluck <i>et al. </i>(2002) y Nardi <i>et al. </i>(2004) observaron que tras la adici&oacute;n de diferentes tipos de compost, aumentaba la abundancia de microorganismos beneficiosos para el crecimiento vegetal, reduci&eacute;ndose el n&uacute;mero de microorganismos pat&oacute;genos, y adem&aacute;s aumentaba la actividad biol&oacute;gica de los &aacute;cidos h&uacute;micos extra&iacute;dos del suelo con efectos hormonales similares a los de las giberelinas sobre plantas de ma&iacute;z. En el <a href="/img/revistas/azm/v26nspe2/a28c1.jpg" target="_blank">Cuadro I</a> se muestran algunos ejemplos de trabajos recientes sobre la supresi&oacute;n de distintas enfermedades de plantas tras la aplicaci&oacute;n de enmiendas org&aacute;nicas.</font></p>     <p align="justify"><font face="verdana" size="2">Debido a esto, en los &uacute;ltimos a&ntilde;os el empleo del vermicompost para otros fines distintos a los tradicionales ha suscitado un gran inter&eacute;s cient&iacute;fico (Edwards <i>et al. </i>2004); su potencial como bioplaguicida contra pat&oacute;genos vegetales y nematodos par&aacute;sitos de plantas abre un campo cient&iacute;fico casi inexplorado y de indudable inter&eacute;s. Aunque hay algunos trabajos que indican que la aplicaci&oacute;n del vermicompost a distintos cultivos reduce notablemente el n&uacute;mero de nematodos par&aacute;sitos de plantas (Ribeiro <i>et al. </i>1998, Swathi <i>et al. </i>1998) y la incidencia de enfermedades producidas por hongos (Nakamura 1996, Nakasone <i>et al. </i>1999), es necesario esclarecer qu&eacute; factores desencadenan esta supresi&oacute;n, y en qu&eacute; medida &eacute;stos dependen del material de origen, de la especie de lombriz de tierra y del proceso de vermicompostaje.</font></p>     <p align="justify"><font face="verdana" size="2"><b>El vermicompost como bioplaguicida contra enfermedades causadas por microorganismos</b></font></p>     <p align="justify"><font face="verdana" size="2">Recientemente se ha demostrado que los vermicomposts pueden tener efectos notables en la supresi&oacute;n de pat&oacute;genos vegetales que producen podredumbre y necrosis radicular en plantas de cultivo. Nakamura (1996) estudi&oacute; las propiedades bioplaguicidas de los vermicomposts contra <i>Plasmidiophora brassicae, Phytophthora nicotianae </i>y <i>Fusarium lycopersici, </i>tres hongos patog&eacute;nicos que causan podredumbre en los cultivos de tomate. Orlikowski (1999) observ&oacute; una reducci&oacute;n en la esporulaci&oacute;n del pat&oacute;geno <i>Phytophthora cryptogea </i>tras la adici&oacute;n de vermicompost, y Nakasone <i>et al. </i>(1999), utilizando extractos acuosos de vermicompost, observaron una inhibici&oacute;n en el crecimiento del micelio de hongos patog&eacute;nicos como <i>Botrytis cinerea, Sclerotinia sclerotiorum, Corticium rolfsii, Rhizoctonia solani </i>y <i>Fusarium oxysporum. </i>La adici&oacute;n de vermicomposts de residuos ganaderos a semillas de tomate redujo notablemente la infecci&oacute;n causada por <i>Fusarium lycopersici </i>(Szczech 1999) y <i>Phytophthora nicotianae </i>(Szczech &amp; Smolinska 2001); sin embargo, Szczech &amp; Smolinska (2001) no encontraron diferencias significativas en la supresi&oacute;n de <i>Phytophthora nicotianae </i>con respecto al sustrato control (turba) cuando utilizaron vermicomposts de lodos residuales.</font></p>     <p align="justify"><font face="verdana" size="2">Arancon <i>et al. </i>(2007a) utilizaron t&eacute; de vermicomposts de distintos residuos org&aacute;nicos (esti&eacute;rcol de vaca, pur&iacute;n de cerdo, restos de comida y residuos de la industria papelera) como bioplaguicida contra los par&aacute;sitos vegetales <i>Pythium, Rhizoctonia, Plectosporium </i>y <i>Verticillium, </i>y observaron una reducci&oacute;n notable de la incidencia de estos pat&oacute;genos en diferentes cultivos. Sahni <i>et al. </i>(2007) estudiaron los efectos de la inoculaci&oacute;n de microorganismos antagonistas <i>(Pseudomonas syringae) </i>y vermicom&#150;post de restos vegetales en la incidencia de <i>Sclerotium rolfsii </i>en la planta del garbanzo <i>(Cicer arietinum) </i>y encontraron que este tratamiento combinado increment&oacute; la disponibilidad de nutrientes para la planta, y redujo su mortalidad.</font></p>     <p align="justify"><font face="verdana" size="2">Siguiendo los modelos de supresi&oacute;n propuestos para el compost (Hoitink &amp; Bohem 1999, Noble &amp; Coventry 2005), la reducci&oacute;n en la incidencia de estas enfermedades podr&iacute;a explicarse bien por una supresi&oacute;n directa del pat&oacute;geno por el vermicompost, o bien mediante la inducci&oacute;n de resistencia sist&eacute;mica en la planta (<a href="#f1">Fig. 1</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/azm/v26nspe2/a28f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">La supresi&oacute;n directa del pat&oacute;geno por la microflora y la microfauna asociadas al vermicompost, puede ser general o espec&iacute;fica dependiendo de si hay un solo agente supresor o si la supresi&oacute;n se debe a la acci&oacute;n conjunta de varios factores. En ambos casos, los mecanismos de supresi&oacute;n propuestos son la competencia, la antibiosis y el parasitismo. Los mecanismos de supresi&oacute;n espec&iacute;fica por el vermicompost no se conocen bien por lo que el papel bioplaguicida de los vermicomposts suele explicarse por el mecanismo de supresi&oacute;n general, ya que la adici&oacute;n de vermicompost incrementa la diversidad de los microorganismos y de la fauna del suelo (Gunadi <i>et al. </i>, 2002) y por lo tanto hay un rango amplio de organismos que pueden actuar como agentes de biocontrol y supresi&oacute;n de enfermedades. Sin embargo, no se conoce el mecanismo exacto de supresi&oacute;n, ni se sabe hasta qu&eacute; punto la capacidad supresora de los vermicomposts depende del material de origen, de la especie de lombriz de tierra y del proceso de vermicompostaje. En este sentido, Lores <i>et al. </i>(2006) demostraron que, en funci&oacute;n de la especie de lombriz empleada y del residuo de partida, las comunidades microbianas originadas tras el proceso de vermicompostaje eran diferentes, lo que podr&iacute;a implicar distintas capacidades para la supresi&oacute;n de enfermedades.</font></p>     <p align="justify"><font face="verdana" size="2">Por otro lado, otros trabajos apuntan a la existencia de mecanismos de inducci&oacute;n de resistencia sist&ecirc;mica. Por ejemplo, Zaller (2006), encontr&oacute; que la aplicaci&oacute;n foliar de extractos de vermicompost redujo la incidencia de <i>Phytophthora infestans </i>en el tomate, y Singh <i>et al. </i>(2003), encontraron que la aplicaci&oacute;n de extractos acuosos de vermicompost a la planta del guisante <i>(Pisum sativum) </i>y al b&aacute;lsamo de jard&iacute;n <i>(Impatiens balsamina) </i>increment&oacute; la resistencia de las mismas contra el ataque de los hongos patog&eacute;nicos <i>Erysiphe pisi </i>y <i>Erysiphe cichoracearum, </i>incrementando tambi&eacute;n la producci&oacute;n de compuestos fen&oacute;licos de la planta.</font></p>     <p align="justify"><font face="verdana" size="2"><b>El vermicompost como bioplaguicida contra los ataques de insectos y &aacute;caros</b></font></p>     <p align="justify"><font face="verdana" size="2">Hay pocos estudios de la aplicaci&oacute;n del vermicompost como bioplaguicida contra insectos y &aacute;caros par&aacute;sitos de plantas. Mediante una serie de experimentos de campo, se ha demostrado que la aplicaci&oacute;n de vermicomposts al suelo redujo notablemente: el<b> </b>grado de infestaci&oacute;n producido por el psilido <i>Heteropsylla cubana </i>en la acacia forrajera <i>Leucaena leucocephala </i>(Biradar <i>et al. </i>1998); la incidencia del insecto minador <i>Aproaerema modicella </i>sobre las hojas de la planta del cacahuete (Ramesh 2000); y el ataque de jassidos, &aacute;fidos, escarabajos coccin&eacute;lidos y &aacute;caros&#150;ara&ntilde;a a la planta del cacahuete (Rao 2002).</font></p>     <p align="justify"><font face="verdana" size="2">Adem&aacute;s de reducir el nivel de infestaci&oacute;n de las plantas, algunos trabajos muestran que tras la aplicaci&oacute;n de vermicompost al suelo se produce una reducci&oacute;n significativa de las poblaciones de insectos par&aacute;sitos. La adici&oacute;n de vermicompost de restos de comida a un cultivo de tomate redujo considerablemente las poblaciones de dos especies de escarabajos <i>(Acalymma vittatum </i>y <i>Diabotrica undecimpunctata) </i>con respecto al tratamiento de fertilizaci&oacute;n inorg&aacute;nica; su aplicaci&oacute;n en un cultivo de pepino tambi&eacute;n disminuy&oacute; las larvas del gusano <i>Manduca quinquemaculata </i>(Yardim <i>et al. </i>2006). Estos autores evaluaron los efectos del vermicompost tanto en invernadero como en campo, y obtuvieron los mismos resultados en ambos experimentos.</font></p>     <p align="justify"><font face="verdana" size="2">Arancon <i>et al. </i>(2005) adicionaron vermicompost de restos de comida a cultivos de tomate, pepino y col, y observaron una disminuci&oacute;n de las poblaciones de &aacute;fidos <i>(Myzuspersicae </i>Sulz.), chinches <i>(Pseudococcus </i>spp.) y orugas blancas <i>(Pieris brassicae </i>L.). Arancon <i>et al. </i>(2007b) tambi&eacute;n registraron una reducci&oacute;n notable de las poblaciones de &aacute;caros&#150;ara&ntilde;a <i>(Tetranychus urticae), </i>chinches <i>(Pseudococcus sp.) </i>y &aacute;fidos <i>(Myzus persicae) </i>en cultivos de tomate y pepino tras la aplicaci&oacute;n de vermicompost de restos de comida.</font></p>     <p align="justify"><font face="verdana" size="2">El vermicompost constituye una fuente de nutrientes de liberaci&oacute;n lenta, que se van poniendo a disposici&oacute;n de la planta a medida que &eacute;sta los va necesitando (Chaoui <i>et al. </i>2003); y act&uacute;a tambi&eacute;n como in&oacute;culo de microorganismos que pueden producir sustancias reguladores del crecimiento vegetal, as&iacute; como microorganismos responsables de la fijaci&oacute;n de N y de la solubilizaci&oacute;n del P. Todo ello puede producir una mejora significativa en la eficacia biol&oacute;gica de la planta y consecuentemente, en su capacidad para combatir plagas (Patriquin <i>et al. </i>1995). Sin embargo, tal y como sucede en la supresi&oacute;n de enfermedades causadas por microorganismos, tampoco se conoce el mecanismo exacto de supresi&oacute;n de insectos y &aacute;caros, ni cu&aacute;les son los principales factores que lo desencadenan, y en qu&eacute; medida &eacute;stos dependen del material de origen, de la especie de lombriz de tierra y del proceso de vermicompostaje.</font></p>     <p align="justify"><font face="verdana" size="2"><b>El vermicompost como bioplaguicida contra nematodos par&aacute;sitos de plantas</b></font></p>     <p align="justify"><font face="verdana" size="2">Hay muy pocos estudios del posible efecto del vermicompost en la supresi&oacute;n de nematodos par&aacute;sitos de plantas. Swathi <i>et al. </i>(1998) demostraron que la adici&oacute;n de 1 kg m<sup>&#150;2</sup> de vermicompost al suelo inhibi&oacute; los ataques del nematodo par&aacute;sito del tabaco <i>Meloidogyne incognita. </i>Tras la aplicaci&oacute;n de vermicompost, Morra <i>et al. </i>(1998) registraron un control parcial de <i>Meloidogyne incognita, </i>y Ribeiro <i>et al. </i>(1998) encontraron una reducci&oacute;n de la masa de huevos de <i>Meloidogyne javanica. </i>Arancon <i>et al. </i>(2003) a&ntilde;adieron vermicompost de restos de comida y de residuos de la industria papelera a un cultivo de uva <i>(Vitis vinifera) </i>y fresa <i>(Fragaria ananasa), </i>y observaron una reducci&oacute;n notable de las poblaciones de nematodos par&aacute;sitos de plantas. Arancon <i>et al. </i>(2007a) tambi&eacute;n registraron una reducci&oacute;n de las poblaciones de nematodos par&aacute;sitos de plantas (g&eacute;neros <i>Heterodera </i>y <i>Meloidogyne) </i>tras la aplicaci&oacute;n de t&eacute; de vermicomposts de distintos residuos org&aacute;nicos.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los posibles mecanismos biol&oacute;gicos que participan en la supresi&oacute;n de nematodos par&aacute;sitos de plantas se basan principalmente en interacciones depredador&#150;presa. La adici&oacute;n de vermicompost al suelo puede incrementar la poblaci&oacute;n de artr&oacute;podos y nematodos omn&iacute;voros depredadores de nematodos par&aacute;sitos de plantas (Bilgrami 1996), y/o estimular el crecimiento de hongos predadores y de especies f&uacute;ngicas que atacan los quistes de nematodos (Kerry 1988). Las enzimas y toxinas producidas por parte de rizobacterias tambi&eacute;n pueden actuar como bioplaguicidas contra los nematodos par&aacute;sitos de plantas (Siddiqui &amp; Mahmood 2001). Otros trabajos como el de Blouin <i>et al. </i>(2005) observaron una reducci&oacute;n en la tasa de infecci&oacute;n pero no en la poblaci&oacute;n de nematodos, lo que sugiere que la presencia de las lombrices afecta a la planta m&aacute;s que al pat&oacute;geno, y apunta a la existencia de otros mecanismos indirectos como una mayor disponibilidad de nutrientes, la estimulaci&oacute;n de microorganismos beneficiosos y a cambios microbianos en rizosfera que podr&iacute;an f&aacute;cilmente estar implicados tambi&eacute;n en la supresi&oacute;n de nematodos par&aacute;sitos de plantas por la aplicaci&oacute;n de vermicompost.</font></p>     <p align="justify"><font face="verdana" size="2">Mientras que existen numerosas evidencias cient&iacute;ficas que demuestran el papel bioplaguicida de los composts hay muy pocos estudios de la posible aplicaci&oacute;n del vermicompost en este campo. Se han observado casos de reducci&oacute;n de la incidencia de pat&oacute;genos vegetales, insectos y nematodos par&aacute;sitos de plantas tras la aplicaci&oacute;n de vermicompost. El papel bioplaguicida de los vermicomposts suele explicarse por el mecanismo de supresi&oacute;n general, ya que la adici&oacute;n de vermicompost incrementa la diversidad de los microorganismos y de la fauna del suelo, y por lo tanto hay un rango amplio de organismos que pueden actuar como agentes biocontrol contra la supresi&oacute;n de enfermedades. Sin embargo, no se conoce el mecanismo exacto de supresi&oacute;n, ni cu&aacute;les son los principales factores que lo desencadenan, y en qu&eacute; medida &eacute;stos dependen del material de origen, de la especie de lombriz de tierra y del proceso de vermicompostaje. El desarrollo de investigaciones en este sentido es fundamental para incrementar tanto la eficacia del vermicompost como bioplaguicida, como su valor comercial.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p>     <p align="justify"><font face="verdana" size="2">Este trabajo ha sido financiado por la Xunta de Galicia (proyectos 07MRU023383PR) y el Ministerio de Ciencia e Innovaci&oacute;n (proyecto CTM2009&#150;08477). Mar&iacute;a G&oacute;mez<b> </b>ha sido financiada por una beca del Ministerio espa&ntilde;ol de Educaci&oacute;n. Cristina Lazcano ha sido financiada mediante un contrato del programa '&Aacute;ngeles Alvari&ntilde;o' (Xunta de Galicia).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2"><b>Abbasi, P. A., J. Al&#150;Dhamani, F. Sahin, H. A. J. Hoitink, &amp; S. A. Miller. </b>1997. 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