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43 resultados encontrados para: AUTOR: Virgen Sánchez, Armando
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1.
Artículo
Resumen en: Inglés |
Resumen en inglés

•The induction of defences in response to herbivory is a key mechanism of plant resistance. While a number of studies have investigated the time course and magnitude of plant induction in response to a single event of herbivory, few have looked at the effects of recurrent herbivory. Furthermore, studies measuring the effects of the total amount and recurrence of herbivory on both direct and indirect plant defences are lacking. To address this gap, here we asked whether insect leaf herbivory induced changes in the amount and concentration of extrafloral nectar (an indirect defence) and concentration of leaf phenolic compounds (a direct defence) in wild cotton(Gossypium hirsutum). •We conducted a greenhouse experiment where we tested single event or recurrent herbivory effects on defence induction by applying mechanical leaf damage and caterpillar (Spodoptera frugiperda) regurgitant. •Single events of 25% and 50% leaf damage did not significantly influence extrafloral nectar production or concentration. Extrafloral nectar traits did, however, increase significantly relative to controls when plants were exposed to recurrent herbivory (two episodes of 25% damage). In contrast, phenolic compounds increased significantly inresponse to single events of leaf damage but not to recurrent damage. In addition, we found. that local induction of extrafloral nectar production was stronger than systemic induction, whereas the reverse pattern was observed for phenolics. •Together, these results reveal seemingly inverse patterns of induction of direct andindirect defences in response to herbivory in wild cotton.


2.
- Artículo con arbitraje
PDF
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.
Capítulo de libro - Memoria en extenso
*Solicítelo con su bibliotecario/a
¿La experiencia previa afecta la oviposicion de Anastrepha obliqua?
Chiu Magaña, Marcela ; Virgen Sánchez, Armando (coaut.) ; Malo Rivera, Edi Álvaro (coaut.) ; Gómez Ruiz, Jaime (coaut.) ; Hernández Ortiz, Emilio (coaut.) ; Rojas, Julio C. (coaut.) ;
Contenido en: Entomología mexicana 2013 México : Sociedad Mexicana de Entomología, c2013 Vol. 12, tomo 1, p. 525-529 ISBN:978-607-7151-08-1
Nota: Solicítelo con su bibliotecario/a

4.
- Artículo con arbitraje
Oviposition of the saltmarsh caterpillar moth (Lepidoptera: Arctiidae) is influenced by the presence of host plant and time of day
Castrejón Ayala, Federico ; Virgen Sánchez, Armando (coaut) ; Rojas, Julio C. (coaut.) ;
Contenido en: Southwestern Entomologist Vol. 37, no. 2 (2012), p. 103-113 ISSN: 0147-1724
Resumen en: Inglés |
Resumen en inglés

The saltmarsh caterpillar moth, Estigmene acrea (Dairy), is a generalist that feeds on more than 60 plant species of different families. We investigated the influence of the host plant on oviposition by saltmarsh caterpillar, particularly on the number of eggs laid and survival of females, as well as the daily pattern of oviposition. The preoviposition time was delayed by the absence of plant material. Females enclosed with leaves of soybean, Glycine max (L.) Merr., laid more eggs in comparison to females without plant material. In the presence of plant material, females oviposited more eggs during the third, fourth, and fifth nights, whereas without soybean leaves, no peak of oviposition was observed. Fifty percent of the total number of eggs by all females was laid between the third and fourth nights in the treatment with plants and between the fifth and sixth nights in the treatment without plants. Females in the absence of plant material lived longer in comparison to females with soybean leaves. Fifty percent of the females enclosed with plant material died by Night 7, while 50% of females without plants died by Night 9. In a separate experiment, we found no difference in the number of mature eggs in females exposed to plant material compared to those not exposed. However, the same females laid more eggs in the presence of host plants compared to females deprived of plant material. Females oviposited mostly during the night, and few eggs were laid during the day. Females laid 72% of the eggs during the first six hours of the night; maximum oviposition occurred between 2000–2200 hours.


5.
- Artículo con arbitraje
Evaluación de trampas de colores para Trips del mango ataulfo en El Soconusco, Chiapas
Virgen Sánchez, Armando (autor) ; Santiesteban Hernández, Antonio (autor) ; Cruz López, Leopoldo Caridad (autor) ;
Disponible en línea
Contenido en: Revista Mexicana de Ciencias Agrícolas Vol. 2, no. 4 (julio-agosto, 2011), p. 579-581 ISSN: 2007-0934
PDF PDF
Resumen en: Español | Inglés |
Resumen en español

En este trabajo se evaluaron trampas de colores para capturar trips en árboles de mango cv. Ataulfo en el Soconusco, Chiapas, México. Se compararon trampas pegajosas de color azul, amarillo y violeta. Se colocó una trampa de cada color por árbol y se evaluaron en 5 árboles. Los resultados mostraron que se capturaron significativamente más trips en las trampas de color violeta.

Resumen en inglés

In this paper colored traps were evaluated to capture thrips in mango cv. Ataulfo trees in Soconusco, Chiapas, Mexico. Sticky traps were compared in different colors, blue, yellow and violet. It was placed a trap of each color per tree and they were evaluated in five trees. The results showed that significantly more thrips were caught in violet traps.


6.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Presencia de orius ensidiosus (Say) (Hemiptera: anthocoridae) en inflorescencias de mango Ataulfo en el Soconusco, Chiapas, México
Santiesteban Hernández, Antonio ; Virgen Sánchez, Armando (coaut.) ; Hénaut, Yann (coaut.) ; Cruz López, Leopoldo Caridad (coaut.) ;
Contenido en: Acta Zoológica Mexicana (Nueva Serie) Vol. 27, no. 2 (agosto 2011), p. 497-499 ISSN: 0065-1737
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
51085-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Inglés |
Resumen en inglés

The pirate bug Orius insidiosus (Say) was found for the first time in the inflorescences of mango cultivar Ataulfo in Soconusco, Chiapas, Mexico.


7.
Capítulo de libro
Atracción de Prorops nasuta, un parasitoide de la broca del café, a los estimulos olfativos asociados al huesped
Chiu Alvarado, Pilar (autor) ; Virgen Sánchez, Armando (autor) ; Rojas, Julio C. (autor) ;
Clasificación: AR/633.73976 / C4
Contenido en: Entomología Mexicana Vol.5 (2006), p. 404-409
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
51817-10 (Disponible)
Disponibles para prestamo: 1

8.
Artículo
Color preference of Anastrepha obliqua (Diptera, Tephritidae)
López Guillén, Guillermo ; Virgen Sánchez, Armando (coaut.) ; Rojas, Julio C. (coaut.) ;
Contenido en: Revista Brasileira de Entomologia Vol. 53, no. 1 (2009), p. 157-159 ISSN: 0085-5626
PDF PDF
Resumen en: Inglés | Portugués |
Resumen en inglés

The color preference of A. obliqua was evaluated in two-choice tests. The results showed that both sexes were attracted to wavelengths ranging from 340 nm to 670 nm, although the broad major peak of attraction occurred between 380 and 570 nm.

Resumen en portugués

Preferência de cor por Anastrepha obliqua (Macquart) (Diptera, Tephritidae). A preferência de cor por A. obliqua foi avaliada em testes de dupla escolha. Os resultados mostraram que ambos os sexos foram atraídos aos comprimentos de onda que variam de 340 nm a de 670 nm, embora o principal pico da atração de A. obliqua tenha ocorrido entre 380 e 570 nm.


9.
Capítulo de libro - Memoria en extenso sin arbitraje
*Solicítelo con su bibliotecario/a
Comportamiento de localización de huésped por los parasitoides de la broca del café
Chiu Alvarado, María del Pilar (autora) ; Virgen Sánchez, Armando (autor) ; Rojas, Julio C. (autor) ;
Disponible en línea
Contenido en: La boca del café en América tropical: hallazgos y enfoques / editores: Juan Francisco Barrera, Armando García, Víctor Domínguez, Cándido Luna Distrito Federal, México : Sociedad Mexicana de Entomología : El Colegio de la Frontera Sur, 2007 páginas 121-130 ISBN:978-970-9712-43-8
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
53156-10 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
53156-20 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a
Resumen en español

El comportamiento de localización de huéspedes por los parasitoides de la broca del café (Hypothenemushampei) es un área de investigación poco atendida a pesar de que muchos estudios sobre la biología y ecología tanto de la broca como de sus parasitoides han sido realizados. En este trabajo se presentan los resultados de investigaciones sobre la influencia de los estímulos químicos provenientes del complejo planta-herbívoro en el comportamiento de búsqueda de huésped de los parasitoides de H. hampei. El tema es abordado con aspectos generales sobre la importancia de estudiar el comportamiento de localización de huéspedes y sus implicaciones en las acciones de control biológico. La bioecología del sistema tritrófico en estudio (café-broca-parasitoides) también se describe en forma general. Las investigaciones más sobresalientes sobre el papel de las señales químicas involucradas en el proceso de localización de huéspedes por los parasitoides Porops nasuta, Cephalonomia stephanoderis, C. hyalinipennis y Phymastichus coffea, son presentados y discutidas dentro del contexto de su biología. Los volátiles de frutos infestados, de los desechos alimenticios y fecales derivados de la actividad de la broca, y de los inmaduros extraídos de frutos de café infestados, son las fuentes principales de atracción en tal interacción tritrófica.

Resumen en inglés

The study of host location behavior by the parasitoids of the coffee berry borer (Hypothenemus hampei) is an area of research that has been largely neglected. In this paper, we present the results of our research on the influence of chemical cues derived from the plant-herbivore complex on the host location behavior of coffee berry borer parasitoids. Firstly, we discuss the general aspects of the importance of studying the host location and its implications in biological control. Secondly, we describe in general form the bio-ecology of the tritrophic system (coffee-herbivore-parasitoids) studied here. Thirdly, we present and discuss our results on the role of the chemical cues involved in host location process of the parasitoids Prorops nasuta, Cephalonomia stephanoderis, C. hyalinipennis and Phymastichus coffea. The volatiles from infested coffee berry, dust/frass produced by borer activity and host immatures are the principal attraction sources in this tritrophic system.

Índice

1. Introducción
2. Modelo de estudio
3. Respuesta de los parasitoides a volátiles del café y la broca
3.1. Estímulos químicos a larga distancia
3.2. Estímulos químicos a corta distancia
3.3. ¿Qué tan específica es la respuesta a los estímulos químicos?
3.4. Otros factores que afectan la respuesta a estímulos químicos
4. Conclusiones y perspectivas
5. Agradecimientos
6. Literatura Citada


10.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Chemical cues used in host location by Phymastichus coffea, a parasitoid of coffee berry borer adults, Hypothenemus hampei
Rojas, Julio C. ; Castillo Vera, Alfredo (coaut.) ; Virgen Sánchez, Armando (coaut.) ;
Clasificación: AR/633.73976 / R65
Contenido en: Biological Control Vol. 37, no. 2 (May 2006), p. 141-147 ISSN: 1049-9644
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
ECO010009552 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
B10155 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
PDF
Resumen en: Inglés |
Resumen en inglés

The wasp Phymastichus coffea LaSalle is a primary parasitoid that attacks adults of the coffee berry borer, Hypothenemus hampei Ferrari, the most serious pest of coffee in the world. We carried out a series of experiments in the laboratory to elucidate the role of chemical cues used by P. coffea during host location. In Y-tube olfactometer bioassays, P. coffea females were attracted to mechanically damaged and infested coffee berries, but not to uninfested ones. Immature stages and adults of H. hampei isolated from infested berries were not attractive to parasitoids, whereas the mixture of dust and frass collected from the infested berries was highly attractive. A dose-response experiment indicated a clear positive relationship between wasp response and the amount of dust/frass present. Females were significantly attracted to dust/frass originating from arabica (Coffea arabica L.) and robusta coffee (Coffea canephora Pierre ex Frohner), but not to dust/frass originating from an artificial diet used for rearing H. hampei, or to dust/frass from a non-target host, Hypothenemus crudiae (Panzer). The results are discussed in relation to the natural history of P. coffea.