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14 resultados encontrados para: AUTOR: Bernal, Julio S.
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1.
- Artículo con arbitraje
Nonsensical choices? Fall armyworm moths choose seemingly best or worst hosts for their larvae, but neonate larvae make their own choices
Rojas, Julio C. ; Kolomiets, Michael V. (coaut.) ; Bernal, Julio S. (coaut.) ;
Contenido en: PLoS One Vol. 13, no. 5, e0197628 (May 2018), p. 1-29 ISSN: 1932-6203
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Resumen en: Inglés |
Resumen en inglés

Selecting optimal host plants is critical for herbivorous insects, such as fall armyworm (Spodoptera frugiperda), an important maize pest in the Americas and Africa. Fall armyworm larvae are presumed to have limited mobility, hence female moths are presumed to be largely responsible for selecting hosts. We addressed host selection by fall armyworm moths and neonate and older (3rd-instar) larvae, as mediated by resistance and herbivory in maize plants. Thus, we compared discrimination among three maize cultivars with varying degrees of resistance to fall armyworm, and between plants subjected or not to two types of herbivory. The cultivars were: (i) susceptible, and deficient in jasmonic acid (JA) production and green leaf volatiles (GLV) emissions (inbred line B73-lox10); (ii) modestly resistant (B73), and; (iii) highly resistant (Mp708). The herbivory types were: (i) ongoing (= fall armyworm larvae present), and; (ii) future (= fall armyworm eggs present). In choice tests, moths laid more eggs on the highly resistant cultivar, and least on the susceptible cultivar, though on those cultivars larvae performed poorest and best, respectively. In the context of herbivory, moths laid more eggs: (i) on plants subject to versus free of future herbivory, regardless of whether plants were deficient or not in JA and GLV production; (ii) on plants subject versus free of ongoing herbivory, and; (iii) on plants not deficient in compared to deficient in JA and GLV production. Neonate larvae dispersed aerially from host plants (i.e. ballooned), and most larvae colonized the modestly resistant cultivar, and fewest the highly resistant cultivar, suggesting quasi-directional, directed aerial descent.

Finally, dispersing older larvae did not discriminate among the three maize cultivars, nor between maize plants and (plastic) model maize plants, suggesting random, visually-oriented dispersal. Our results were used to assemble a model of host selection by fall armyworm moths and larvae, including recommendations for future research.


2.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

The composition and seasonal occurrence of sandflies were investigated in coffee agroecosystems in the Soconusco region of Chiapas, Mexico. Insect sampling was performed on three plantations located at different altitudes: Finca Guadalupe Zajú [1,000 m above sea level (a.s.l.)], Finca Argovia (613 m a.s.l.) and Teotihuacán del Valle (429 m a.s.l.). Sandflies were sampled monthly from August 2007-July 2008 using three sampling methods: Shannon traps, CDC miniature light traps and Disney traps. Sampling was conducted for 3 h during three consecutive nights, beginning at sunset. A total of 4,387 sandflies were collected during the course of the study: 2,718 individuals in Finca Guadalupe Zajú, 605 in Finca Argovia and 1,064 in Teotihuacán del Valle. The Shannon traps captured 94.3% of the total sandflies, while the CDC light traps and Disney traps captured 4.9% and 0.8%, respectively. More females than males were collected at all sites. While the number of sandflies captured was positively correlated with temperature and relative humidity, a negative correlation was observed between sandfly numbers and rainfall. Five species of sandflies were captured: Lutzomyia cruciata, Lutzomyia texana, Lutzomyia ovallesi, Lutzomyia cratifer / undulata and Brumptomyia sp. Lu. cruciata, constituting 98.8% of the total, was the most abundant species. None of the captured sandflies was infected with Leishmania spp.


3.
Artículo
Impacts of weather, shade cover and elevation on coffee leafminer Leucoptera coffeella (Lepidoptera: Lyonetiidae) population dynamics and natural enemies
Lomelí Flores, J. Refugio ; Barrera, Juan F. (coaut.) ; Bernal, Julio S. (coaut.) ;
Contenido en: Crop Protection Vol. 29, no. 9 (September 2010), p. 1039-1048 ISSN: 0261-2194
Resumen en: Inglés |
Resumen en inglés

We assessed the influences of ambient temperature, rainfall, shade cover and elevation on seasonal abundance of coffee leafminer Leucoptera coffeella (Guérin-Ménèville) and its natural enemies in coffee farms in the Soconusco region of Chiapas, Mexico. Mined coffee leaves were most abundant during the rainy season (i.e. historical average rainfall >200 mm/mo, April–November) compared to the dry season (<100 mm/mo, December–March), and at low (<600 m asl) relative to high (>900 m asl) elevations. The abundance of mined leaves increased with rainfall, and decreased with maximum daily temperatures. Coffee leafminer survivorship was highest during the dry season (>40%), when predation was lowest (<10%). Predation was the main source of coffee leafminer mortality, and was greatest during the rainy season (>25%) when coffee leafminer incidence was highest (>30% mined leaves per plant). None of the weather variables that were evaluated (viz. maximum and minimum temperatures, and rainfall) significantly impacted parasitism ratios.

Shade cover moderated on-farm temperatures, by reducing maximum daily temperatures and any potential, direct impacts of rainfall on coffee leafminer, by providing partial shelter from rainfall, but did not significantly affect coffee leafminer incidence. In 48 h laboratory trials, coffee leafminer oviposition was highest at 28 °C (not, vert, similar15 eggs/female), minimal at 25 °C (not, vert, similar3 eggs) and nil at 20 °C, and higher during night-time hours (>8 eggs/female/day) compared to day-time hours (<1 egg). Historical average temperatures were higher at low elevation (yearly average ca. 25 °C; range = 18.0–32.0 °C) than at high elevation (ca. 21 °C; 13.5–28.5 °C), and we predicted that physical environmental conditions (i.e. night-time hours with temperatures > 20 °C) were permissive of coffee leafminer oviposition during twice as many hours each year at low elevation (4060 h) compared to high elevation (2081 h). Overall, our results suggested that evident differences in the abundance of coffee leafminer between elevations may be due in considerable part to differences in ambient temperatures, particularly night-time temperatures, rather than rainfall, shade cover, or elevation per se.


4.
Tesis - Maestría
Variación espacial de la estructura comunitaria de flebotomineos (Diptera: psychodidae) en Quintana Roo / Emigdio May Uc
May Uc, Emigdio ; Hernández Arana, Héctor Abuid (tutor) ; Rebollar Téllez, Eduardo Alfonso (asesor) ; Rojas, Julio C. (asesor) ; Ibáñez Bernal, Sergio (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2010
Clasificación: TE/595.77097267 / M3
Cerrar
SIBE Campeche
ECO040003969 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030007049 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010008568 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020012487 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
ECO050004331 (Disponible)
Disponibles para prestamo: 1
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Índice | Resumen en: Español |
Resumen en español

Los flebotomineos son vectores de patógenos del género Leishmania spp. causantes de leishmaniasis, localmente conocida como “úlcera de los chicleros”. Quintana Roo es un estado que se encuentra en una región endémica de leishmaniasis y se conocen las especies de flebotomineos sólo para algunas localidades, por lo que no se sabe cómo es su distribución ni los factores que lo condicionan. Por esta razón se decidió estudiar la riqueza, la abundancia y distribución de estos insectos relacionándolos a los tipos de vegetación, gradientes de humedad, temperatura y velocidad del viento en el estado. Para lograr este objetivo, se elaboró un diseño jerárquico anidado a diferentes escalas espaciales muestreando 18 localidades en Quintana Roo (en una localidad sitios con vegetación conservada y otra con vegetación perturbada a distancias de un km, entre localidades, 30 km y entre zonas 100 km). Se capturaron 14 532 ejemplares de 20 especies pertenecientes a dos géneros de Phlebotominae. En dos escalas espaciales (Localidades y zonas) el análisis PERMANOVA mostró diferencias en la composición y abundancia de los flebotomineos. A escalas de un kilómetro entre la vegetación perturbada y conservada no existe diferencia en la estructura comunitaria, observando la mayor variación a escalas menores.

A escalas espaciales de 30 km, entre localidades, los factores que provocan las diferencias en la composición y abundancia son los tipos de vegetación y suelos que se presenta entre las localidades. Entre las zonas las diferencias en la estructura comunitaria se asocian a los gradientes históricos de temperatura, precipitación y tipos de vegetación del estado. Los datos de temperatura, humedad relativa y velocidad del viento registrados in situ durante los muestreos no mostraron ningún patrón espacial y al analizar los datos ambientales con los de composición y abundancias de los flebotomineos, el análisis BioEnv tampoco mostró correlación estadística alguna.

Índice

Índice
Índice de cuadros
Índice de figuras
Resumen
Introducción
Objetivos
Objetivos específicos
Hipótesis
Materiales y Métodos
Área de estudio
Localidades y períodos de muestreo
Análisis de datos
Resultados
Especies exclusivas
Promedios de abundancia y promedio de riqueza de especies
Dominancia de especies
Curva de acumulación de especies
Análisis de la estructura comunitaria y patrones espaciales de diferencias y variabilidad
PERMANOVA:
BioEnv
Discusión
Conclusiones
Literatura Citada
Apéndice I. Lista de especies registradas es este trabajo
Apéndice II. Mapas
Apéndice III. Artículo enviado a Acta Zoológica Mexiana. Nueva Serie


5.
Capítulo de libro - Memoria en extenso
*Solicítelo con su bibliotecario/a
Hormigas depredadoras del minador de la hoja del café, Leucoptera coffeella (Lepidoptera: Lyonetiidae) en el Soconusco, Chiapas, México
Lomelí Flores, J. Refugio ; Bernal, Julio S. (coaut.) ; Barrera, Juan F. (coaut.) ; Quiroz Robledo, Luis N. (coaut.) ;
Contenido en: XXXI congreso nacional de control biológico: memoria Zacatecas, Zacatecas, México : Universidad Autónoma de Zacatecas, Sindicato del Personal Académico, 2008 p. 313-316 ISBN:968-9099-10-8
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6.
Artículo
*En hemeroteca, SIBE-Tapachula
Impact of natural enemies on coffee leafminer Leucoptera coffeella (Lepidoptera: Lyonetiidae) population dynamics in Chiapas, Mexico
Lomeli Flores, J. Refugio ; Barrera, Juan F. (coaut.) ; Bernal, Julio S. (coaut.) ;
Contenido en: Biological Control Vol. 51, no. 1 (October 2009), p. 51-60 ISSN: 1049-9644
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
44448-30 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Coffee leafminer, Leucoptera coffeella, is a pest in many New World coffee growing areas. Previous studies suggested that its population dynamics were strongly affected by natural enemies, particularly of larvae, and physical environmental conditions. Our study documented through field surveys and life table analyses (i) the natural enemy complex associated with coffee leafminer and (ii) the impacts of natural enemies on the population dynamics of coffee leafminer, on coffee (Coffea arabica) at two elevations and two rainfall levels in the Soconusco region of Chiapas, Mexico. Twenty-two larval parasitoid species (including 14 morphospecies) were collected. Egg and pupal parasitoids were not recovered. Life table analyses showed that parasitism contributed 10% of real mortality, and parasitism rates were 8–10-fold higher at the low (<550 m) versus high (>950 m) elevation; parasitism rates were similar under low (<100 mm) and high (>400 mm) rainfall. Seventeen predator species (including five morphospecies) were collected, of which most were ants (Formicidae, 14 species) that contributed >58% of real mortality.

Life table analyses showed that predation rates were higher at high versus low elevation and under high versus low rainfall. Independently of elevation and rainfall, egg predation (likely by ants) was the most important source of indispensable mortality (range = 0.13–0.30), except at low elevation and high rainfall where pupal predation (=0.14) was similarly important. Also, predation was the main source of coffee leafminer larval and pupal mortality during a 13-month period in a low elevation coffee farm and was highest during the rainy season (>400 mm rainfall/month), when coffee leafminer prevalence was highest. Overall, predation of eggs and pupae (the latter particularly at low elevation), mostly by ants, were the most important sources of coffee leafminer mortality. Because ants were the main source of coffee leafminer egg and pupal mortality, their importance and potential role in coffee pest management strategies were discussed.


7.
Capítulo de libro
*Solicítelo con su bibliotecario/a
La academia en la problemática fitosanitaria del agave tequilero: manejo de plagas
Solís Aguilar, Juan Fernando (autor) ; Rojas, Julio C. (autor) ; Bernal, Julio S. (autor) ; González Hernández, Héctor (autor) ;
Contenido en: Estado actual del manejo de plagas y enfermedades del agave tequilero. Memorias del simposio prioridades fitosanitarias actuales en el cultivo de agave tequilana Weber var. azul / editores: Julio S. Bernal, Aideé Orozco Hernández, ...[et al.] Distrito Federal, México : Colegio de Postgraduados : Tequila Sauza, 2007 p. 89-114 ISBN:968-839-528-5
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
28634-10 (Disponible)
Disponibles para prestamo: 1
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8.
Capítulo de libro
*Solicítelo con su bibliotecario/a
Conceptos de manejo integrado de plagas
Bernal, Julio S. (autor) ; Rojas, Julio C. (autor) ; González Hernández, Héctor (autor) ;
Disponible en línea
Contenido en: Manejo de plagas del agave tequilero / Héctor González Hernández, José Ignacio del Real Laborde, Juan Fernando Solis Aguilar (Eds.) Distrito Federal, México : Colegio de Postgraduados : Tequila Sauza, 2007 p. 25-38 ISBN:968-839-527-7
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9.
Libro
Estado actual del manejo de plagas y enfermedades del agave tequilero: memorias del simposio prioridades fitosanitarias actuales en el cultivo de agave tequilana Weber var. azul / Julio S. Bernal, Aideé Orozco Hernández, ...[et al.]
Bernal, Julio S. (editor) ; Orozco Hernández, Aideé (editora) ;
Distrito Federal, México : Colegio de Postgraduados :: Tequila Sauza , 2007
Clasificación: 633.577 / E8
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020012078 (Disponible)
Disponibles para prestamo: 1

10.
Capítulo de libro - Memoria en extenso sin arbitraje
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Implementación del manejo holístico de plagas en cafetales. I. Diagnóstico participativo
Barrera, Juan F. (autor) ; Herrera Múñoz, Joel (autor) ; Jiménez, Gonzalo (autor) ; Jiménez, Daniel (autor) ; Escobar, Leonides (autor) ; Barrios, Guadalupe (autora) ; Arellano, Antolín (autor) ; Arellano, Miguel A. (autor) ; Mérida, Baldomero (autor) ; López, Guadalupe (autora) ; Bernal, Julio S. (autor) ;
Disponible en línea
Contenido en: Resúmenes : x congreso internacional de manejo integrado de plagas y agroecología / Alfredo Castillo, Jaime Gómez, Helda Morales, Jorge Toledo y Ramón Jarquín, editores Tapachula, Chiapas, México : El Colegio de la Frontera Sur, 2006 p. 199-201 ISBN:970-9712-22-5
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
37145-20 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
37145-30 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a