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10 resultados encontrados para: AUTOR: Sullivan, Brian T.
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1.
Artículo
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Discrimination of odors associated with conspecific and heterospecific frass by sibling species Dendroctonus frontalis (Coleoptera: Curculionidae: Scolytinae) and Dendroctonus mesoamericanus (Coleoptera: Curculionidae: Scolytinae)
Niño Domínguez, Alicia ; Sullivan, Brian T. (coaut.) ; López Urbina, José Higinio (coaut.) ; Macías Sámano, J. E. (coaut.) ;
Contenido en: Environmental Entomology Vol. 47, no. 6 (December 2018), p. 1532-1540 ISSN: 0046-225X
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

In the Central American region, the aggressive, sibling bark beetles Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae: Scolytinae) and Dendroctonus mesoamericanus Armendáriz-Toledano & Sullivan (Coleoptera: Curculionidae: Scolytinae) commonly colonize pines concurrently, and in nature they avoid heterospecific pairing, although it can be produced in the lab. We performed walking arrestment bioassays in the lab to examine the capacity of both sexes of both species to discriminate odors from frass expelled from gallery entrances of either solitary females or conspecific pairs of either species. Males of both species strongly preferred odors of frass from solitary, conspecific females over those of heterospecific females or pairs of either species. Female D. frontalis did not discriminate among these frass categories, whereas female D. mesoamericanus preferred frass of conspecific females. In gas chromatography–electroantennographic detection and gas chromatography–mass spectrometry analyses, we determined that males of both species could sense a nearly identical spectrum of approximately 16 host- and beetle-produced compounds present in frass of females of one or both species. Only two of these compounds, endo-brevicomin and ipsdienol, which were present in frass of female D. mesoamericanus and pairs of either species but absent in frass of solitary D. frontalis females, qualitatively distinguished these categories. Several known attractants and synergists for either species declined in concentration postpairing. Our results complement earlier research and indicate how semiochemical composition and concentration in frass might mediate male discrimination of attack sites of conspecific, unpaired females. Furthermore, our data indicate that semiochemical responses for walking females differ from those of males and between species.


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

In southern Mexico and Central America, the southern pine beetle Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae: Scolytinae) commonly colonizes host trees simultaneously with Dendroctonus mesoamericanus Armend ariz-Toledano and Sullivan, a recently described sibling species. We hypothesized that cross-species pheromone responses by host-seeking beetles might mediate joint mass attack, bole partitioning, and reproductive isolation between the species. Previous studies had indicated that D. frontalis females produce frontalin and that female D. mesoamericanus produce frontalin, endo-brevicomin, and ipsdienol (males of both species produce endo-brevicomin and possibly ipsdienol). In field trapping trials in the Mexican state of Chiapas, D. frontalis was attracted to the lure combination of turpentine and racemic frontalin; racemic endobrevicomin enhanced this response. In a single test, D. mesoamericanus was attracted in low numbers to the combination of turpentine, racemic frontalin, and racemic endo-brevicomin after the addition of racemic ipsdienol; in contrast, racemic ipsdienol reduced responses of D. frontalis. Inhibition of D. frontalis was generated in both sexes by (+)- and racemic ipsdienol, but by (-)-ipsdienol only in females. Logs infested with D. mesoamericanus females (the pioneer sex in Dendroctonus) attracted both species in greater numbers than either D. frontalis female-infested or uninfested logs. Our data imply that D. frontalis may be more attracted to pioneer attacks of D. mesoamericanus females, and that this could be owing to the presence of endo-brevicomin in the latter. Possible intra- and inter-specific functions of semiochemicals investigated in our experiments are discussed.


3.
Tesis - Doctorado
Semioquímicos como mecanismo de aislamiento reproductivo precopulatorio entre las especies hermanas Dendroctonus frontalis y Dendroctonus mesoamericanus (Curculionidae: scolytinae) / Alicia Niño Domínguez
Niño Domínguez, Alicia ; Sullivan, Brian T. (director) ; Cruz López, Leopoldo Caridad (tutor) ; Zúñiga Bermúdez, Gerardo (asesor) ; Liedo Fernández, Pablo (asesor) ;
Tapachula, Chiapas, México : El Colegio de la Frontera Sur , 2016
Clasificación: TE/595.768097275 / N5
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ECO040006289 (Disponible)
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ECO020013428 (Disponible)
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ECO050006046 (Disponible)
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Índice | Resumen en: Español |
Resumen en español

Dendroctonus frontalis Zimmermann y D. mesoamericanus Armendariz-Toledano & Sullivan son especies primarias cercanamente relacionadas que comúnmente coexisten en el mismo hospedero, lo cual es poco evidente en la naturaleza y poco entendida. Se exploró la influencia de los semioquímicos como posibles mecanismos de aislamiento reproductivo que operan entre estas dos especies. Con el uso de estímulos naturales y sintéticos relacionados a las hembras se realizaron en una primera etapa, bioensayos con machos y pruebas electrofisiológicas, con lo que se obtuvo el perfil de semioquímicos de las hembras de cada especie. En una segunda etapa se realizaron pruebas en campo de atracción cruzada. Los resultados indican que los machos de cada especie discriminan entre las hembras con- y heteroespecíficas a través de reconocer los semioquímicos relacionados a estas. Al parecer la endo-brevicomina y el ipsdienol producidos por las hembras de D. mesoamericanus contribuyen de manera importante en la mediación de la discriminación. Los resultados sugieren que entre los machos de cada especie presentan estrategias diferentes para el reconocimiento de la pareja. D. frontalis después de responder a los semioquímicos relacionados al sitio de agregación y de su arribo sobre el hospedero realiza el reconocimiento formal de la pareja, mientras que D. mesoamericanus lo hace con mayor grado de especificidad antes y después del arribo al hospedero. Los resultados obtenidos permiten concluir que los semioquímicos funcionan como un mecanismo de aislamiento reproductivo precopulatorio, no obstante este mecanismo no es absoluto.

Índice

Dedicatorias
Agradecimientos
Resumen
Capítulo I
Introducción general
1. Comunicación química para la obtención del recurso en el género Dendroctonus
1.1 Sistema de comunicación química de D. frontalis
1.2 Sistema de comunicación química de D. mesoamericanus
2. Mecanismos de aislamiento reproductivo en insectos descortezadores
3. Coexistencia entre las especies del género Dendroctonus
3.1 Coexistencia entre D. frontalis y D. mesoamericanus
Justificación
Hipótesis general
Objetivo general
Objetivos particulares
Materiales y Métodos generales
Capítulo II
Pheromone-Mediated Mate Location and Discrimination by Two Syntopic Sibling Species of Dendroctonus Bark Beetles in Chiapas, Mexico
Capítulo III
Volátiles del frass producido por hembras sintópicas de las especies hermanas D. frontalis ZIMM y D. mesoamericanus Toledano&Sullivan, como mediadores de la respuesta discriminativa de machos en el reconocimiento de la pareja
Capítulo IV
Responses by Dendroctonus frontalis and D. mesoamericanus (Coleoptera: Curculionidae) to semiochemical lures in Chiapas, Mexico: multiple roles of pheromones during joint host attacks
Capítulo V
Discusión general
Conclusiones generales
Literatura Citada


4.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
A new species of bark beetle, dendroctonus mesoamericanus sp. nov. (Curculionidae: Scolytinae), in southern Mexico and Central America
Armendáriz Toledano, Francisco ; Niño Domínguez, Alicia (coaut.) ; Sullivan, Brian T. (coaut.) ; Kirkendall, Lawrence R. (coaut.) ; Zúñiga Bermúdez, Gerardo (coaut.) ;
Contenido en: Annals of the Entomological Society of America Vol. 108, no. 3 (May 2015), p. 403-414 ISSN: 1938-2901
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Resumen en: Inglés |
Resumen en inglés

The bark beetle Dendroctonus mesoamericanus sp. nov. is described from a population in Parque Nacional Lagunas de Montebello, La Trinitaria, Chiapas, Mexico. This species belongs to the D. frontalis complex, which includes D. adjunctus Blandford 1897, D. approximatus Dietz 1890, D. brevicomis LeConte 1876, D. frontalis Zimmermann 1868, D. mexicanus Hopkins 1905, and D. vitei Wood 1975. The new species can be distinguished from closely related species D. frontalis, D. mexicanus, and D. vitei by four diagnostic morphological characters: the presence of striations on the preepisternal area of the prothorax (anterolateral pronotum) in both sexes, seminal rod with an approximately linear posterior margin of the dorsal process (in lateral view), irregularly sized ornamentations on the distal edge of squamiform plates present on the eighth abdominal tergite in females, and an inconspicuous pronotal callus in females. Furthermore, the karyotype of D. mesoamericanus sp. nov. (5AAþXyp/XX) differs from that of its sister species D. frontalis (7AAþ Xyp/XX). Dendroctonus mesoamericanus sp. nov. is distributed in Belize, Guatemala, El Salvador, Honduras, Nicaragua, and in the Michoaca´n, Oaxaca, and Chiapas states in Mexico. In these countries, this species has been collected at elevations above from 311 to 2600mon six pine species, and it commonly occurs in syntopy with D. frontalis.


5.
- Artículo con arbitraje
Pheromone-mediated mate location and discrimination by two syntopic sibling species of dendroctonus bark beetles in Chiapas, Mexico
Niño Domínguez, Alicia (autora) ; Sullivan, Brian T. (autor) ; López Urbina, José Higinio (autor) ; Macías Sámano, J. E. (autor) ;
Disponible en línea
Contenido en: Journal of Chemical Ecology Vol. 41, no. 8 (August 2015), p. 746-756 ISSN: 1573-1561
Resumen en: Inglés |
Resumen en inglés

Where their geographic and host ranges overlap, sibling species of tree-killing bark beetles may simultaneously attack and reproduce on the same hosts. However, sustainability of these potentially mutually beneficial associations demands effective prezygotic reproductive isolation mechanisms between the interacting species. The pine bark beetle, Dendroctonus frontalis Zimmermann, is syntopic in the Central American region with a recently described sibling species, Dendroctonus mesoamericanus Armendáriz-Toledano and Sullivan, but mechanisms for their reproductive isolation are uncertain. We investigated whether semiochemicals mediate species discrimination by mate-seeking males of both species. In olfactometer bioassays, walking males of both species strongly preferred odors from gallery entrances of conspecific females. Coupled gas chromatography-electroantennographic detection and gas chromatography-mass spectrometry isolated 16 olfactory stimulants for males in these odors, but only two, ipsdienol and endo-brevicomin (both from D. mesoamericanus females), differed in quantity in female-associated odors between the species. In olfactometer bioassays, with 10, 1, or 0.1 female entrance equivalents of synthetic semiochemicals, the combination of ipsdienol and endo-brevicomin inhibited responses of male D. frontalis and enhanced responses of male D. mesoamericanus to two compounds associated with female entrances of both species (the pheromone component frontalin and host odor α-pinene). We conclude that ipsdienol and endo-brevicomin, pheromone components produced by females of just one of the two species (D. mesoamericanus), mediate interspecific mate discrimination by males of both species and provide an apparently symmetrical reproductive isolation mechanism.


6.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Two species within dendroctonus frontalis (Coleoptera: Curculionidae): evidence from morphological, karyological, molecular, and crossing studies
Armendáriz Toledano, Francisco ; Niño Domínguez, Alicia (coaut.) ; Sullivan, Brian T. (coaut.) ; Macías Sámano, J. E. (coaut.) ; Víctor, Javier (coaut.) ; Clarke, Stephen R. (coaut.) ; Zúñiga Bermúdez, Gerardo (coaut.) ;
Contenido en: Annals of the Entomological Society of America Vol. 107, no. 1 (Jan 2014), p. 11-27 ISSN: 0013-8746
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
53180-10 (Disponible)
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Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Dendroctonus frontalis Zimmermann is considered one of the most important economic and ecological forest pests in the United States, Mexico, and Central America. Recently, two apparent morphological variants of this species were discovered occurring syntopically in Central America and southern Mexico. Morphotype A beetles lack a series of Þne parallel ridges on the episternal area of the prothorax that are present on morphotype B. The goal of the present work was to clarify the taxonomic status of the morphotypes of the D. frontalis species complex. Geometric morphometric analyses of seminal rod and spermatheca shape together with the characterization of 16 attributes of external morphology revealed differences in quantitative and qualitative characters that distinguished adults of the two morphotypes from each other as well as from the closely related species Dendroctonus vitei Wood and Dendroctonus mexicanus Hopkins. Karyotype analysis of morphotype B revealed a chromosomal formula (5AA Xyp) distinct from that found in morphotype A previously reported for D. frontalis (7AA Xyp). In the laboratory, forced intermorphotype crosses produced F1 progeny but at lower frequency than intramorphotype pairings, and dissections of spermatheca revealed a lower frequency of insemination at least one type of heterotypic cross. Phylogenetic analysis of the D. frontalis species complex based on 786 bp of the cytochrome oxidase I gene indicated that morphotypes B and A are two independent groups with 98% nodal support within D. frontalis. These data provide compelling evidence that the two syntopic morphotypes represent two distinct sibling species.


7.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Biochemical evidence that Dendroctonus frontalis consists of two sibling species in Belize and Chiapas, Mexico
Sullivan, Brian T. ; Niño Domínguez, Alicia (coaut.) ; Moreno Castillo, Benjamín (coaut.) ; Brownie, Cavell (coaut.) ; Macías Sámano, J. E. (coaut.) ; Clarke, Stephen R. (coaut.) ; Kirkendall, Lawrence R. (coaut.) ; Zúñiga Bermúdez, Gerardo (coaut.) ;
Contenido en: Annals of the Entomological Society of America Vol. 105, no. 6 (2012), p. 817-831 ISSN: 0013-8746
Bibliotecas: Tapachula
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SIBE Tapachula
35895-20 (Disponible)
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Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae: Scolytinae) is a major economic pest of pines in the United States, Mexico, and Central America. We report biochemical investigations relevant to the taxonomic status and semiochemistry of two distinct morphotypes of D. frontalis recently detected in the Central American region. Morphotype A beetles (pre-episternal area of prothorax of both sexes smooth, bulging callus on anterolateral margin of prothorax of females) and morphotype B beetles (pre-episternal area of prothorax of both sexes with fine ridges, reduced female callus) collected in infestations in Chiapas, Mexico differed significantly in their production of 10 behaviorally-active compounds occurring in the genus Dendroctonus, including the major pheromone components for D. frontalis. Notably, host-attacking morphotype B females produced hundreds of nanograms of both endo-brevicomin and frontalin, whereas morphotype A females produced similar amounts of frontalin but subnanogram quantities of endo-brevicomin. Reanalysis of a published D. frontalis trapping study in Chiapas indicated that both morphotypes responded in greatest numbers when frontalin and endo-brevicomin baits were both present. In addition, we quantified 18 different cuticular hydrocarbons (the methyl-branched alkane components) from both morphotypes collected in Belize and Chiapas as well as morphotype A beetles from the southeastern United States, and principal component analysis revealed nonoverlapping clusters associated with either morphotype. This evidence of two distinct, complex phenotypes coexisting in the same sites and host trees supports the hypothesis that the D. frontalis morphotypes represent separate species and consequently indicates that the taxonomy of D. frontalis should be re-evaluated in the Central American region.


8.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Electrophysiological and behavioral responses of the bark beetle dendroctonus rhizophagus to volatiles from host pines and conspecifics
Cano Ramírez, Claudia ; Armendáriz Toledano, Francisco (coaut.) ; Macías Sámano, J. E. (coaut.) ; Sullivan, Brian T. (coaut.) ; Zúñiga Bermúdez, Gerardo (coaut.) ;
Contenido en: Journal of Chemical Ecology Vol. 38, no. 5 (2012), p. 512-524 ISSN: 0098-0331
Bibliotecas: Tapachula
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SIBE Tapachula
5250-20 (Disponible)
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Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

The bark beetle Dendroctonus rhizophagus is endemic to northwestern Mexico where it kills immature pines < 3 m tall. We report the first investigation of the chemical ecology of this pest of forest regeneration. We used GC-EAD to assess olfactory sensitivity of this species to volatile compounds from: resin of a major host, Pinus arizonica; mid/hindguts of single, gallery-initiating females; and mate-paired males within galleries of attacked host trees in the field. Antennae of both sexes responded to monoterpenes α-pinene, β-pinene and 3-carene as well as to the beetle-derived oxygenated monoterpenes fenchyl alcohol, myrtenal, cis-verbenol, trans-verbenol, verbenone, and myrtenol. These monoterpenes were quantified from pre-emerged D. rhizophagus adults forced to attack host tissue in the laboratory, and from individuals dissected from naturally-attacked hosts at different stages of colonization. In both bioassays, myrtenol and trans-verbenol were the most abundant volatiles, and trans-verbenol was the only one produced in significantly greater quantities by females than males in a naturally-colonized host. Two field experiments were performed to evaluate behavioral responses of D. rhizophagus to antennally-active monoterpenes. Results show that 3-carene was significantly attractive either alone or in a ternary (1:1:1) combination with α-pinene and β-pinene, whereas neither α-pinene nor β-pinene alone were attractive. None of the beetle-associated oxygenated monoterpenes enhanced the attractiveness of the ternary mixture of monoterpenes, while verbenone either alone or combined with the other five oxygenated terpenes reduced D. rhizophagus attraction to the ternary mixture. The results suggest that attraction of D. rhizophagus to the host tree P. arizonica is mediated especially by 3-carene. There was no conclusive evidence for an aggregation or sex attractant pheromone.


9.
Tesis - Maestría
Diferenciación morfológica y comportamental de dos morfos de Dendroctonus frontalis Zimmermann (Coleoptera: Scolytinae) en Montebello, Chiapas / Benjamín Moreno Castillo
Moreno Castillo, Benjamín ; Macías Sámano, J. E. (tutor) ; Cruz López, Leopoldo Caridad (asesor) ; Rojas, Julio C. (asesor) ; Sullivan, Brian T. (asesor) ;
Tapachula, Chiapas, México : El Colegio de la Frontera Sur , 2008
Clasificación: TE/595.763097275 / M6
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ECO050003479 (Disponible)
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Índice | Resumen en: Español |
Resumen en español

De las 11 especies de Dendroctonus (Coleoptera: Scolytinae) presentes en México, se considera a D. frontalis Zimmermann como la mas importante dado su alto poder destructivo de árboles de pino (Pinus spp.). Recientemente investigadores especialistas en el tema, encontraron en bosques de Belice y del Parque Nacional Lagunas de Montebello (PNLM), Chiapas, Mexico, una pequeña población de insectos de Dendroctonus (aparentemente D. frontalis) con notables diferencias en las dimensiones corporales con respecto a las dimensiones normales reportadas para las especies de Dendroctonus. A priori se ha utilizado una longitud de 4 mm de tamaño de cuerpo para separar a ambos morfos, sin embargo es necesario encontrar otras variables morfológicas y comportamentales que permitan hacer una mejor separación de ambos grupos de insectos. Por esta razón se realizó el presente trabajo de investigación que tuvo como objetivos encontrar las variables morfológicas que permitan separar a ambos grupos de insectos, además de conocer la distribución espacial de ambos morfos a lo largo del fuste de sus dos especies hospederas y conocer su respuesta en campo a semioquímicos sintéticos colocados en trampas.

Los resultados demostraron que el morfo M1 (identificado como D. frontalis) y el morfo M2 (especie no identificada) de ambos sexos pueden separarse por la presencia/ausencia de estrías localizadas cerca del margen anterior del tórax, en la zona correspondiente a la micangia de las hembras. Asimismo en las hembras de ambos grupos, el tamaño de la micangia y la forma del pronoto en vista dorsal también fueron variables importantes, mientras que en machos la forma de la varilla seminal resultó ser una variable útil para hacer esta diferenciación. Otro experimento reveló que el M1 es mas abundante en P. oocarpa y a las alturas de fuste de 4-5 y 6-7 m, mientras que el M2 en P. maximinoi y alturas bajas (0-3m). El trampeo en campo usando combinaciones de aguarrás (fuente de α-pineno), frontalina y endo-brevicomina (ambas racémicas) permitieron incrementar las capturas del M1, sin embargo las capturas del M2 fueron nulas e insuficientes para el análisis estadístico. Se discuten y comparan los resultados con los de otros trabajos similares.

Índice

Resumen
I. Introducción
II. Objetivos
General
Específicos
III. Materiales y Métodos
A. Diferenciación morfológica de ambos grupos de insectos
B. Distribución espacial de los morfos en los árboles hospederos
C. Captura en campo con atrayentes
IV. Resultados y Discusión
A. Diferenciación morfológica de ambos grupos de insectos
B. Distribución espacial de los morfos en los árboles hospederos
C. Captura en campo con atrayentes
V. Conclusiones
Referencias
Anexos


10.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Field response of dendroctonus frontalis (Coleoptera: Scolytinae) to synthetic semiochemicals in Chiapas, Mexico
Moreno Castillo, Benjamín ; Macías Sámano, J. E. (coaut.) ; Sullivan, Brian T. (coaut.) ; Clarke, Stephen R. (coaut.) ;
Contenido en: Journal of Economic Entomology Vol. 101, no. 6 (Nov. 2008), p. 1821-1825 ISSN: 0022-0493
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
22697-30 (Disponible)
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Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Dendroctonus frontalis Zimmermann (Coleoptera: Scolytinae) is the most serious pest of pines (Pinus spp.) in Mexico. Conspecifics are attracted to trees undergoing colonization by the aggregation pheromone frontalin, which is synergized by odors of pine oleoresin released from beetle-damaged host tissue. Synthetic racemic frontalin combined with turpentine has been the operational bait used in traps for monitoring populations of D. frontalis in Mexico as well as the United States. Recently, racemic endo-brevicomin has been reported to be a synergist of the frontalin/turpentine bait and as an important component of the aggregation pheromone for D. frontalis populations in the United States. To determine whether racemic endo-brevicomin also might function as an aggregation synergist for the geographically isolated D. frontalis populations of Central America and Mexico, we performed a field trapping trial in Lagunas de Montebello National Park, Chiapas, Mexico, during July and August 2007. The combination of endo-brevicomin (placed either directly on the trap or 4 m away) plus racemic frontalin and turpentine caught at least 5 times more D. frontalis of both sexes than did turpentine either alone or in combination with either frontalin or endo-brevicomin. The addition of endo-brevicomin to the frontalin/turpentine bait also increased the proportion of females trapped. We conclude that the addition of endo-brevicomin might substantially improve the efficiency of the frontalin/turpentine bait for monitoring of D. frontalis in Central America and Mexico. We discuss factors that reconcile our results with previous studies that reported endo-brevicomin to be an attractant antagonist for populations of D. frontalis in Mexico and Honduras.