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52 resultados encontrados para: AUTOR: Vega, Fernando E.
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1.
- Artículo con arbitraje
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While [CO2] effects on growth and secondary chemistry are well characterized for annual plant species, little is known about perennials. Among perennials, production of Coffea arabica and C. canephora (robusta) have enormous economic importance worldwide. Three Arabica cultivars (Bourbon, Catimor, Typica) and robusta coffee were grown from germination to ca. 12 months at four CO2 concentrations: 300, 400, 500 or 600 ppm. There were significant increases in all leaf area and biomass markers in response to [CO2] with significant [CO2] by taxa differences beginning at 122–124 days after sowing (DAS). At 366–368 DAS, CO2 by cultivar variation in growth and biomass response among Arabica cultivars was not significant; however, significant trends in leaf area, branch number and total above-ground biomass were observed between Arabica and robusta. For caffeine concentration, there were significant differences in [CO2] response between Arabica and robusta. A reduction in caffeine in coffee leaves and seeds might result in decreased ability against deterrence, and consequently, an increase in pest pressure. We suggest that the interspecific differences observed (robusta vs. Arabica) may be due to differences in ploidy level (2n = 22 vs. 2n = 4x = 44). Differential quantitative and qualitative responses during early growth and development of Arabica and robusta may have already occurred with recent [CO2] increases, and such differences may be exacerbated, with production and quality consequences, as [CO2] continues to increase.


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Twenty-nine DNA regions of plastid origin have been previously identified in the mitochondrial genome of Cucurbita pepo (pumpkin; Cucurbitaceae). Four of these regions harbor homolog sequences of rbcL, matK, rpl20–rps12 and trnL–trnF, which are widely used as molecular markers for phylogenetic and phylogeographic studies. We extracted the mitochondrial copies of these regions based on the mitochondrial genome of C. pepo and, along with published sequences for these plastome markers from 13 Cucurbita taxa, we performed phylogenetic molecular analyses to identify inter-organellar transfer events in the Cucurbita phylogeny and changes in their nucleotide substitution rates. Phylogenetic reconstruction and tree selection tests suggest that rpl20 and rbcL mitochondrial paralogs arose before Cucurbita diversification whereas the mitochondrial matK and trnL–trnF paralogs emerged most probably later, in the mesophytic Cucurbita clade. Nucleotide substitution rates increased one order of magnitude in all the mitochondrial paralogs compared to their original plastid sequences. Additionally, mitochondrial trnL–trnF sequences obtained by PCR from nine Cucurbita taxa revealed higher nucleotide diversity in the mitochondrial than in the plastid copies, likely related to the higher nucleotide substitution rates in the mitochondrial region and loss of functional constraints in its tRNA genes.


3.
- Artículo con arbitraje
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Sterility of the coffee berry borer, Hypothenemus hampei (Coleoptera: Curculionidae), caused by the nematode Metaparasitylenchus hypothenemi (Tylenchidae: Allantonematidae)
Castillo Vera, Alfredo (autor) ; Martínez, Félix (autor) ; Gómez Ruiz, Jaime (autor) ; Cisneros Hernández, Juan (autor) ; Vega, Fernando E. (autor) ;
Contenido en: Biocontrol Science and Technology Vol. 26, no. 8 (June 2019), p. 786-795 ISSN: 0958-3157
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Metaparasitylenchus hypothenemi is an endoparasitic nematode that causes partial or total sterility of coffee berry borer (Hypothenemus hampei) females, although the causes are unknown. Fecundity and the average size of the common and lateral oviduct, vitellarium, and germarium in the four ovarioles (I, II, III and IV) were compared between parasitised and non-parasitised insects to determine the causes of sterility. The nematode significantly lowers the number of oocytes and 86% of parasitised insects (24 out of 28 insects) were sterile, while fecundity in the remaining 13% was non-significantly different to that in non-parasitised insects. No significant differences were recorded in the size of the common oviduct, lateral oviduct, vitellarium, and germarium between parasitised and non-parasitised insects and the nematode does not cause any apparent damage on the surface of the ovary.


4.
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Artificial diet sandwich reveals subsocial behaviour in the coffee berry borer Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae)
Vega, Fernando E. ; Simpkins, Ann M. (coaut.) ; Rodríguez Soto, Marian M. (coaut.) ; Infante, Francisco (coaut.) ;
Contenido en: Journal of Applied Entomology Vol. 141, no. 6 (July 2017), p. 470-476 ISSN: 1439-0418
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An artificial diet sandwich, consisting of coffee berry borer artificial diet within two glass plates, has been developed to elucidate the behaviour of the coffee berry borer, an insect that in nature spends most of its life cycle inside the coffee berry. Various types of behaviour have been observed for the first time, including gallery construction, oviposition, gallery blocking, mating and most remarkably, subsocial tasks such as maternal sanitation and tending of eggs and larvae. This observational technique is a break- through for studies and manipulations of the coffee berry borer’s social behaviour and could be applicable to other bark beetles, consequently yielding important insights into the origin of parental care in scolytine beetles.


5.
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Mouthpart structure and elemental composition of the mandibles in the coffee berry borer (Coleoptera: Curculionidae: Scolytinae)
Vega, Fernando E. (autor) ; Bauchan, Gary Roy (autor) ; Infante, Francisco (autor) ; Davis, Steve (autor) ;
Contenido en: Annals of the Entomological Society of America Vol. 110, no. 4 (July 2017), p. 381-389 ISSN: 0013-8746
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The various parts of the mouth in the coffee berry borer, Hypothenemus hampei (Ferrari), have been visualized and identified using scanning electron m icroscopy. The labial and maxillary palpi are three jointed and connected by a membrane that allows for t elescoping. The maxillary palpi contain two types of sensilla (basiconic and campaniform) within an apic al cuticular depression in the third segment of the palpus. The sides of the third segment of the maxillary palpus exhibits rod-shaped depressions, known as sensilla digitiformia. Sev eral cuticular elements were detected in the mandibles, including Al, C, Ca, Cl, Mg, Na, O, P, and Zn. Zinc, a heavy metal, was only detected in the incisors and could provide abrasion resistance.


6.
- Artículo con arbitraje
A potential repellent against the coffee berry borer (Coleoptera: Curculionidae: Scolytinae)
Vega, Fernando E. ; Simpkins, Ann (coaut.) ; Miranda, Jose (coaut.) ; Harnly, James M. (coaut.) ; Infante, Francisco (coaut.) ; Castillo Vera, Alfredo (coaut.) ; Wakarchuk, David (coaut.) ; Cossé, Allard (coaut.) ;
Contenido en: Journal of Insect Science Vol. 17, no. 6, 122 (Nov. 2017), p. 1-9 ISSN: 1536-2442
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The coffee berry borer, Hypothenemus hampei (Ferrari), continues to pose a formidable challenge to coffee growers worldwide. Because of the cryptic life habit of the insect inside coffee berries, effective pest management strategies have been difficult to develop. A sesquiterpene, (E,E)-α-farnesene, produced by infested coffee berries has been identified as a potential repellent against the coffee berry borer both in laboratory bioassays and a field experiment in Hawaii. Various laboratory bioassays revealed significantly lower levels of infestation in berries treated with different concentrations of the (E,E)-α-farnesene. A field experiment in Hawaii resulted in up to 80% decreased coffee berry borer captures in traps containing a standard 3:1 methanol:ethanol attractant and a bubble cap formulation of (E,E)-α-farnesene compared to traps with just the attractant. (E,E)-α-farnesene was still active 19 wk after installation in the coffee plantation, based on 59% lower insect captures in traps containing the attractant + (E,E)-α-farnesene (1,737 insects) compared to traps containing the attractant (4,253 insects). The easy to install bubble caps are a welcome contrast with other pest management strategies that require spraying. The placement of (E,E)-α-farnesene in bubble caps in coffee plantations when coffee berries first become susceptible to infestations (ca. 90 d post-flowering) might result in lower infestation levels throughout the season, and consequently, increased yields and profits.


7.
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Thrips (Thysanoptera) of coffee flowers
Infante, Francisco ; Ortíz, José A. (coaut.) ; Solis Montero, Lislie (coaut.) ; Mound, Laurence A. (coaut.) (1934-) ; Vega, Fernando E. (coaut.) ;
Contenido en: Annals of the Entomological Society of America Vol. 110, no. 3 (May 2017), p. 329–336 ISSN: 1809-127X
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Thrips (Thysanoptera) are opportunistic insects that exhibit a wide range of life histories. Most species are either fungivorous or phytophagous, while a few are predators. In coffee agroecosystems, the presence of these insects is noticeable, especially when coffee is flowering. The identity of thrips and the role they might be playing on coffee flowers is unknown. We conducted a survey of thrips in 30 commercial coffee plantations of Chiapas, Mexico, with the aim to investigate the species composition of thrips associated with coffee flowers and to determine whether they were carrying coffee pollen on their bodies. Thrips were collected at random in ~1 ha. Coffee branches were shaken against a plastic tray to separate insects from flowers. A total of 42 thrips species in 24 genera and five families were identified. The most common species were Karnyothrips merrilli Watson, Haplothrips gowdeyi (Franklin), Frankliniella difficilis Hood, Frankliniella gardeniae Moulton, Frankliniella insularis (Franklin), Frankliniella invasor Sakimura, Frankliniella parvula Hood, and Frankliniella varipes Moulton. Of these species, Karnyothrips merrilli is considered a predator of thrips and other small arthropods, while the other species are phytophagous. We assumed these thrips might be living on other plants and shift to coffee due to the abundance of pollen and nectar during the flowering season. Using microscopy, we examined the bodies of thrips caught in sticky traps. We found coffee pollen on the bodies of seven thrips species, and discuss the possibility of these thrips serving as coffee pollinators.


8.
Libro
Riqueza y conservación de los mamíferos en México a nivel estatal / editores: Miguel Briones-Salas, Yolanda Hortelano-Moncada, Gloria Magaña-Cota, Gerardo Sánchez-Rojas y Javier Enrique Sosa-Escalante
Briones Salas, Miguel Ángel (ed.) ; Hortelano Moncada, Yolanda (coed.) ; Magaña Cota, Gloria (coed.) ; Sánchez Rojas, Gerardo (coed.) ; Sosa Escalante, Javier Enrique (coed.) ;
Distrito Federal, México : Universidad Nacional Autónoma de México. Instituto de Biología :: Asociación Mexicana de Mastozoología :: Universidad de Guanajuato , c2016
Clasificación: 599.0972 / R5/Vol. 1
Bibliotecas: Campeche
Cerrar
SIBE Campeche
ECO040006774 (Disponible) , ECO040006543 (Disponible)
Disponibles para prestamo: 2

9.
Libro
Bark beetles: biology and ecology of native and invasive species / edited by Fernando E. Vega, Richard W. Hofstetter
Vega, Fernando E. (editor) ; Hofstetter, Richard W. (aditor) ;
London, UK : Elsevier :: Academic Press , 2015
Clasificación: 595.768 / B3
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020013360 (Disponible) , ECO020013349 (Prestado) , ECO020013230 (Prestado)
Disponibles para prestamo: 1
Índice | Resumen en: Inglés |
Resumen en inglés

Bark Beetles: Biology and Ecology of Native and Invasive Species provides a thorough discussion of these economically important pests of coniferous and broadleaf trees and their importance in agriculture. It is the first book in the market solely dedicated to this important group of insects, and contains 15 chapters on natural history and ecology, morphology, taxonomy and phylogenetics, evolution and diversity, population dynamics, resistance, symbiotic associations, natural enemies, climate change, management strategies, economics, and politics, with some chapters exclusively devoted to some of the most economically important bark beetle genera, including Dendroctonus, Ips, Tomicus, Hypothenemus, and Scolytus. This text is ideal for entomology and forestry courses, and is aimed at scientists, faculty members, forest managers, practitioners of biological control of insect pests, mycologists interested in bark beetle-fungal associations, and students in the disciplines of entomology, ecology, and forestry.

Índice

1. Natural History of Bark Beetles
2. Morphology, Taxonomy and Phylogenetics of Bark Beetles
3. Evolution of Bark Beetles
4. Population Dynamics of Bark Beetles
5. Conifer Defense and Resistance to Bark Beetles
6. Symbiotic Associations of Bark Beetles: Ecology and Evolution
7. Natural enemies of bark beetles: Predators, parasitoids, pathogens and nematodes
8. Dendroctonus
9. Biology, Systematics, and Evolution of Ips
10. The genus
11. Hypothenemus, with Emphasis on the Coffee Berry Borer
12. Scolytus and Other Economically Important Bark and Ambrosia Beetles
13. Modeling Bark Beetle Responses to Climate Change
14. Management Strategies for Bark Beetles in Conifer Forests
15. Economy and Politics of Bark Beetles


10.
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The coffee berry borer (Coleoptera: Curculionidae): how many instars are there?
Gómez Ruiz, Jaime ; Chávez Guzmán, Brenda Yaneth (coaut.) ; Castillo Vera, Alfredo (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Vega, Fernando E. (coaut.) ;
Contenido en: Annals of the Entomological Society of America Vol. 108, no. 3 (2015), p. 311-315 ISSN: 0013-8746
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After more than a century since the description of the coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae), and dozens of scientific articles on the basic biology of the insect, there is still debate on the number of female larval instars. This article analyzes the metamorphosis of H. hampei females through direct observations during its entire biological cycle in the laboratory, together with scanning electron microscope photos. Also, the size of the head capsule of wild larvae and prepupae was analyzed with Dyar’s rule and a discriminant analysis was conducted. Only two instars were observed during H. hampei metamorphosis up to the adult stage. Contrasting morphological changes in the larvae occurred when they transformed into prepupae, with no previous ecdysis. The statistical analysis revealed that the width of the cephalic masses form two significantly distinct groups before transformation into pupa, confirming that the prepupal stage forms part of the second larval instar.