<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792022000100708</article-id>
<article-id pub-id-type="doi">10.28940/terra.v40i0.1066</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Implementación del procesamiento de imágenes para la evaluación de la mancha de asfalto (Phyllachora maydis) en maíz (Zea mays)]]></article-title>
<article-title xml:lang="en"><![CDATA[Implementation of image processing for the evaluation of tar spot (Phyllachora maydis) in corn (Zea mays)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vinces-Tachong]]></surname>
<given-names><![CDATA[Rómulo Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vélez-Ruiz]]></surname>
<given-names><![CDATA[Mayra Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaibor-Fernández]]></surname>
<given-names><![CDATA[Ramiro Remigio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Eguez]]></surname>
<given-names><![CDATA[Favio Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Técnica Estatal de Quevedo  ]]></institution>
<addr-line><![CDATA[Los Ríos Quevedo]]></addr-line>
<country>Ecuador</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>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792022000100708&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792022000100708&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792022000100708&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La enfermedad conocida como mancha de asfalto (Phyllachora maydis) afecta al cultivo de maíz (Zea mays). Esta enfermedad causa lesiones en las hojas que al progresar pueden ocasionar la muerte de la planta. Existen diferentes métodos para evaluar el progreso de una enfermedad en las plantas. Generalmente, se utilizan escalas de evaluación visual; sin embargo, su uso es bastante subjetivo. El procesamiento de imágenes ha sido utilizado como una alternativa para la evaluación de enfermedades. Este método evita sesgos y errores durante las evaluaciones. El objetivo de este ensayo fue utilizar el aplicativo telefónico Leaf Doctor como una alternativa a la evaluación de la enfermedad producida por P. maydis. Para el experimento se utilizó un diseño de bloques completamente al azar. Se sembraron tres variedades de maíz y se evaluó el nivel de tolerancia a la mancha de asfalto al ser tratadas con diferentes dosis de silicio. Las diferentes dosis de silicio no reducen la enfermedad, sin embargo, fue posible determinar aumento de la producción de maíz en dosis de silicio de 252 kg ha-1. Los resultados indican que el programa puede considerarse como una alternativa eficiente para evaluar la mancha de asfalto debido a la alta correlación con la escala de evaluación visual (R2: 0.77-0.94). La variedad más resistente a la enfermedad fue INIAP-551.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: The disease known as tar spot (Phyllachora maydis) affects corn (Zea mays). It causes lesions on the leaves that, when progressing, can cause the death of the plant. There are different methods to assess the progress of a disease in plants. Visual assessment scales are generally used; however, their use is quite subjective. Image processing has been used in recent times as an alternative for the evaluation of plant diseases. This alternative avoids bias and error during evaluations. The objective of this experiment was to use the Leaf Doctor cell phone application as an alternative to the evaluation of the disease caused by P. maydis. For the experiment, a completely randomized block design was used. Three varieties of corn were planted and the level of tolerance to tar spot was evaluated when treated with different doses of silicon. The most resistant variety to the disease was INIAP-551. The different doses of silicon do not reduce the disease; however, it was possible to determine an increase in the production of corn in doses of silicon of 252 kg ha-1. The results indicate that the program can be considered as an efficient alternative to evaluate the development of the disease known as tar spot due to the high correlation with the visual assessment scale (R2: 0.77-0.94).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[dosis]]></kwd>
<kwd lng="es"><![CDATA[hoja]]></kwd>
<kwd lng="es"><![CDATA[resistente]]></kwd>
<kwd lng="es"><![CDATA[silicio]]></kwd>
<kwd lng="es"><![CDATA[susceptible]]></kwd>
<kwd lng="en"><![CDATA[doses]]></kwd>
<kwd lng="en"><![CDATA[leaf]]></kwd>
<kwd lng="en"><![CDATA[resistant]]></kwd>
<kwd lng="en"><![CDATA[silicion]]></kwd>
<kwd lng="en"><![CDATA[susceptible]]></kwd>
</kwd-group>
</article-meta>
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