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18 resultados encontrados para: AUTOR: Penagos Torres, Dora Isabel
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1.
Artículo
*En hemeroteca, SIBE-Tapachula
Ultralow rates of spinosad in phagostimulant granules provide control of spodoptera frugiperda (Lepidoptera: noctuidae) in maize
Williams, Trevor ; Cisneros Hernández, Juan (coaut.) ; Penagos Torres, Dora Isabel (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Tamez-Guerra, Patricia (coaut.) ;
Contenido en: Journal of Economic Entomology Vol. 97, no. 2 (2004), p. 422-428 ISSN: 0022-0493
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
B2549 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Field trails in 2002 and 2003 were performed to determine the efficacy of maize flour-based granular formulations with ultralow rates of the naturally derived insecticide spinosad (0.1, 0.3, and 1.0 g [AI]/ha), for control of Spodoptera frugiperda (J.E. Smith) in maize, Zea mays L., in southern Mexico. Spinosad formulations were compared with a chemical standard, a commercial granular formulation of chlorpyrifos (150 g [AI]/ha). In both years, application of spinosad resulted in excellent levels of control, indicated by the number of living S. frugiperda larvae recovered from experimental plots. The efficacy of spinosad applied at 0.3 and 1.0 g (AI)/ha was very similar to that of chlorpyrifos. Natural reinfestation caused S. frugiperda numbers in insecticide treated plots to return to values similar to the control treatment by 10–15 d postapplication. Many spinosad-intoxicated larvae collected in the field died later in the laboratory in 2002, but not in 2003. Percentage mortality due to parasitoid emergence did not differ in any treatment in either field trial. The number of parasitoids that emerged from S. frugiperda collected in each treatment was significantly reduced after application of spinosad (all rates) or chlorpyrifos due to a reduction in the number of host larvae. Parasitoid numbers returned to control values by 9–15 d postapplication in all treatments. The most prevalent parasitoid was the braconid Chelonus insularis Cresson, which represented ≈80% of emerging parasitoids in both years. We conclude that appropriate formulation technology can greatly enhance the performance of this naturally derived, biorational insecticide.


2.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Effect of weeds on insect pests of maize and their natural enemies in Southern Mexico
Penagos Torres, Dora Isabel ; Magallanes Cedeño, Ricardo (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Cisneros Hernández, Juan (coaut.) ; Martínez, A. M. (coaut.) ; Goulson, D. (coaut.) ; Chapman, Jason W. (coaut.) ; Caballero, P. (coaut.) ; Cave, Ronald D. (coaut.) ; Williams, Trevor (coaut.) ;
Contenido en: International Journal of Pest Management Vol. 49, no. 2 (Abril-June 2003), p. 155-161 ISSN: 0967-0874
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
B3103 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

A pilot study performed on the Pacific coastal plain of Chiapas, Mexico, focused on the prevalence of maize crop infestation by insect pests, parasitism of pests and the abundance of insect predators in maize plots with weeds compared with plots under a regime of rigorous manual weed control. Sampling was conducted on four occasions at 20, 32, 44 and 56 days post-planting. Infestation of maize by fall armyworm larvae, Spodoptera frugiperda (Lepidoptera: Noctuidae), was more than twice as great in plots with strict weed control compared with weedy plots at 20 days post-planting, but declined thereafter in both treatments. The prevalence of aphid infestation and the abundance of nitidulid beetles were consistently greater in weed-controlled plots. In contrast, the density of beneficial predatory Coleoptera increased significantly in plots with weeds, and it is suggested that this probably explains the lower incidence of pests. S. frugiperda egg masses placed in experimental plots suffered a significantly higher incidence rate of parasitism by Chelonus insularis (Hymenoptera: Braconidae) in clean plots (42.0%) compared with those placed in weedy plots (3.75%); it is suspected that weeds may hinder the location of egg masses by parasitoids. Overall, the presence or absence of weeds had a marked influence on the arthropod community present in maize fields. The weeds did not affect maize plant height, the levels of plant damage or the yield of grain from plants under each type of weed regime, implying that competitive effects of weeds may be offset by greater numbers of beneficial insects in weedy plots. Our pilot study indicates that strict weed control in maize may be unnecessary.


3.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Impact of a nucleopolyhedrovirus bioinsecticide and selected synthetic insecticides on the abundance of insect natural enemies on maize in southern Mexico
Armenta, R. ; Martínez, A. M. (coaut.) ; Chapman, Jason W. (coaut.) ; Magallanes Cedeño, Ricardo (coaut.) ; Goulson, D. (coaut.) ; Caballero, P. (coaut.) ; Cave, Ronald D. (coaut.) ; Cisneros, J. (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Castillejos Puón, Vasty (coaut.) ; Penagos Torres, Dora Isabel (coaut.) ; García, L. F. (coaut.) ; Williams, Trevor (coaut.) ;
Contenido en: Journal of Economic Entomology Vol. 96, no. 3 (June 2003), p. 649-661 ISSN: 0022-0493
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
B3099 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
PDF
Resumen en: Inglés |
Resumen en inglés

The impact of commonly used organophosphate (chlorpyrifos, methamidophos), carbamate (carbaryl), and pyrethroid (cypermethrin) insecticides on insect natural enemies was compared with that of a nucleopolyhedrovirus (Baculoviridae) of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) in maize grown in southern Mexico. Analyses of theSELECTVand Koppert Side Effects (IOBC) databases on the impact of synthetic insecticides on arthropod natural enemies were used to predict 75Ð90% natural enemy mortality after application, whereas the bioinsecticide was predicted to have no effect. Three Þeld trails were performed in mid- and late-whorl stage maize planted during the growing season in Chiapas State, Mexico. Synthetic insecticides were applied at product label recommended rates using a manual knapsack sprayer Þtted with a cone nozzle. The biological pesticide was applied at a rate of 3 1012 occlusion bodies (OBs)/ha using identical equipment. Pesticide impacts on arthropods on maize plants were quantiÞed at intervals between 1 and 22 d postapplication. The biological insecticide based on S. frugiperda nucleopolyhedrovirus had no adverse effect on insect natural enemies or other nontarget insect populations. Applications of the carbamate, pyrethroid, and organophosphate insecticides all resulted in reduced abundance of insect natural enemies, but for a relatively short period (8Ð15 d). Pesticide applications made to late-whorl stage maize resulted in lesser reductions in natural enemy populations than applications made at the mid-whorl stage, probably because of a greater abundance of physical refuges and reduced spray penetration of late-whorl maize.


4.
Capítulo de libro - Memoria en extenso sin arbitraje
*Solicítelo con su bibliotecario/a
Potencial de un nucleopoliedrovirus para el control de Spodoptera frugiperda (Lepidoptera: noctuidae) en el maíz
Cisneros Hernández, Juan (autor) ; Penagos Torres, Dora Isabel (autora) ; Williams, Trevor (autor) ;
Contenido en: Memorias: XXVI congreso nacional de control biológico / editores: Marcelino Vázquez García, J. Francisco Pérez Domínguez, Karla H. Ibarra Cortés, Claudia I. Balpuesta León, Jorge Rafael Vázquez Reyes, Jesús Cervantes Ríos, Nally Ibarra Frías Guadalajara, Jalisco, México : Sociedad Mexicana de Control Biológico, c2003 páginas 315-318 ISBN:970-27-0415-4
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
60096-10 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
60096-20 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a

5.
Artículo
*En hemeroteca, SIBE-Tapachula
Spinosad and nucleopolyhedrovirus mixtures for control of Spodoptera frugiperda (Lepidoptera: Noctuidae) in maize
Méndez Alcudia, Walter Alberto ; Valle Mora, Javier Francisco (coaut.) ; Ibarra, Jorge E. (coaut.) ; Cisneros Hernández, Juan (coaut.) ; Penagos Torres, Dora Isabel (coaut.) ; Williams, Trevor (coaut.) ;
Clasificación: AR/595.78 / S7
Contenido en: Biological Control Vol. 25, no. 2 (October 2002), p. 195-206 ISBN:1049-964
Bibliotecas: Campeche , Tapachula
Cerrar
SIBE Campeche
ECO040004130 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
B7603 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

Spinosad (Dow AgroSciences) is a neurotoxin mixture produced during fermentation of a soil actinomycete that has high activity towards Lepidoptera. Diet surface contamination bioassays were performed with Spodoptera frugiperda multiple nucleopolyhedrovirus (SfMNPV) and Spinosad alone and in mixtures. The interaction of SfMPNV +Spinosad mixtures in S. frugiperda larvae was generally independent or slightly antagonistic in nature, although weak synergism was detected in mixtures containing 3 ppm Spinosad+ 20 or 70 occlusion bodies/mm2 diet of SfMNPV. Mean time to death was not a reliable indicator of mortality over time in larvae exposed to SfMNPV–Spinosad mixtures because Spinosad killed larvae quickly whereas virus mortality occurred at a much lower rate. Therefore, threshold tolerance analysis was employed to generate time–response curves that showed two clear phases; an initial response to Spinosad until -100 h followed by virus-induced mortality at 120–250 h post-contamination.

A field trial was performed to assess the degree of pest control achieved by SfMNPV–Spinosad mixtures applied to maize. Recovery of S. frugiperda larvae was significantly reduced in all treatments compared to recovery from control plots. The mixture of SfMNPV with 3 ppm Spinosad resulted in ca. 90% S. frugiperda control, which was 12.5–32% greater than for plots treated with SfMNPV alone. The impact of low concentrations of Spinosad on non-target arthropods present in the maize crop was evaluated in a field trial. Application of 3 ppm Spinosad had very little effect on the abundance of insect natural enemies present on maize plants, whereas application of the product label recommended rate of 200 ppm Spinosad had effects similar to those observed following application of chlorpyrifos. The use of low concentrations of Spinosad merits further study as a means of controlling lepidopteran pests either alone or in combination with other entomopathogens.


6.
- Artículo con arbitraje
*En hemeroteca, SIBE-Tapachula
Formulation of a Nucleopolyhedrovirus with boric acid for control of Spodoptera frugiperda (Lepidoptera: noctuidae) in maize
Cisneros Hernández, Juan (autor) ; Pérez, José Angel (autor) ; Penagos Torres, Dora Isabel (autor) ; Goulson, Dave (autor) ; Caballero, Primitivo (autor) ; Cave, Ronald D. (autor) ; Williams, Trevor (autor) ;
Clasificación: AR/633.1599 / F6
Contenido en: Biological Control Vol. 23, no. 1 (January 2002), p. 87-95 ISSN: 1049-9644
Bibliotecas: Campeche , San Cristóbal , Tapachula
Cerrar
SIBE Campeche
ECO040006393 (Disponible) , ECO040003370 (Disponible)
Disponibles para prestamo: 2
Cerrar
SIBE San Cristóbal
ECO010005485 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
33926-40 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

The degree of control of the fall armyworm, Spodoptera frugiperda, by a multiple nucleopolyhedrovirus (SfMNPV) appears to be limited by the quantity of inoculum consumed by the insect and the delivery of the virus to the insect feeding site. The formulation of the virus with phagostimulants and/or viral synergists, such as boric acid, may help overcome this problem. The present study aimed to determine the degree of potentiation of boric acid toward SfMNPV in a granular phagostimulant formulation. In a laboratory bioassay the LC50 value for second-instar larvae was reduced from 114 virus occlusion bodies (OBs)/mm2 of diet surface for virus alone to 51 OBs/mm2 of diet in the presence of 1% boric acid. The mean time to death of larvae exposed to virus mixed with 0.5 or 1% boric acid was not significantly different from that of larvae inoculated with virus alone. Increasing the concentration of boric acid at a single determined concentration of virus (80 OBs/mm2) resulted in a significant increase in the prevalence of virus-induced mortality. The boric acid alone did not cause S. frugiperda mortality at the concentrations tested. A field trial performed with S. frugiperda larvae held on plants within fine gauze bags indicated that application of maize flour granules containing virus + 1% boric acid caused a significant increase in virus-induced mortality compared to application of granules containing virus alone.

A randomized block experiment performed later also resulted in a higher prevalence of virus-induced mortality in S. frugiperda larvae exposed to virus mixed with 1% boric acid in samples collected at 5 days postapplication and reared in the laboratory until death or pupation, but not in samples made at 1 day and 3 days postapplication. Differences in the prevalence of virus infection in insects collected at each time point may have been related to the consistency of the granular formulation, which turned into a paste and adhered to the surface of maize plants under conditions of heavy rainfall. Granules containing 1 and 4% boric acid were not toxic to the earwig, Doru taeniatum, in the laboratory. The same concentrations of boric acid sprayed onto maize plants did not significantly reduce the abundance of natural enemies or other nontarget insects at any sample time point. Boric acid offers an economical means of enhancing baculovirus activity with little apparent risk to nontarget arthropods.


7.
Artículo
*En hemeroteca, SIBE-Tapachula
Granular phagostimulant nucleopolyhedrovirus formulations for control of Spodoptera frugiperda in maize
Castillejos Puón, Vasty ; Cisneros Hernández, Juan (coaut.) ; Penagos Torres, Dora Isabel (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Williams, Trevor (coaut.) ;
Contenido en: Biological Control Vol. 24, no. 3 (2002), p. 300-310 ISSN: 1049-9644
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
38407-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Tapachula
Resumen en: Inglés |
Resumen en inglés

The efficacy of bioinsecticides that act by ingestion can be improved by the use of phagostimulant formulations that increase the consumption of the pathogen. A granule recipe comprising of pregelatinized flour, starch, ground maize cob, maize oil, and water was identified that was highly palatable to Spodoptera frugiperda larvae. To compare the performance of a multiple nucleopolyhedrovirus (SfMNPV) in aqueous spray and phagostimulant granules, multiple linear regression procedures were employed to analyze the results of seven independent field trials involving spray applications and eight independent field trials involving application of phagostimulant granules for control of S. frugiperda in maize. Prevalence of infection was positively correlated with the quantity of inoculum applied but negatively correlated with the interval between application and sampling of larvae for both granular and spray formulations. Virus-induced mortality was greater when inoculum was applied in granular than in spray formulation. A field experiment involving the application of 1.5¡Á1012 occlusion bodies (OBs)/ha in quantities of 6, 18, and 32 kg granules/ha indicated that the quantity of granules applied did not significantly affect viral mortality at any timepoint.

Persistence of activity of viral inoculum applied in spray or granular formulations was significantly greater when applied in the granular formulation, with approximately 23% of the original activity remaining at 8 days postapplication compared to <1% in the spray-treated plants. We conclude that the efficacy of SfMNPV was improved by formulation; the granular formulation caused a higher prevalence of infection in S. frugiperda larvae and persisted longer on crop foliage compared to an aqueous spray application. The cost of the formulation ingredients alone was approximately US$0.50/kg. When combined with the virus, the cost of the basic bioinsecticide components would be about US$17/ha, although this estimate does not include additional costs involved in the commercialization of a potential bioinsecticide product.


8.
Capítulo de libro - Memoria en extenso sin arbitraje
*Solicítelo con su bibliotecario/a
Variación diaria de los pesos de larvas de Spodoptera Frugiperda (Smith) (Lepidoptera: Noctuidae) criadas en diferentes dietas semisintenticas
Penagos Torres, Dora Isabel (autora) ; Valle Mora, Javier Francisco (autor) ; Williams, Trevor (autor) ;
Contenido en: XXV congreso nacional de control biológico : alimentos sanos preservando el ambiente : actas / editores: Reginaldo Báez Sañudo, José de Jesús Juvera Bracamontes Hermosillo, Sonora, México: Sociedad Mexicana de Control Biológico, 2002 páginas 108-110 ISBN:970-18-9192-9
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
59679-10 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
59679-20 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a

9.
Capítulo de libro
*Solicítelo con su bibliotecario/a
Efecto tóxicos del Spinosad sobre insectos depredadores
Cisneros Hernández, Juan (autor) ; Goulson, Dave (autor) ; Derwent, Lara C. (autor) ; Penagos Torres, Dora Isabel (autora) ; Hernández, Olivia (autora) ; Williams, Trevor (autor) ;
Contenido en: Memorias del XXXVI congreso nacional de entomología / editores: Sergio G. Stanford Camargo, Alberto Morales Moreno, Jorge Padilla Ramírez, Marcela Ibarra González Distrito Federal, México : Instituto Tecnológico y Estudios Superiores de Monterrey, 2001 páginas e117-e117
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
60319-10 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a

10.
Tesis - Maestría
Effect of weeds on insect pests of maize and their natural enemies in suthern Mexico / Dora Isabel Penagos Torres
Penagos Torres, Dora Isabel ; Williams, Trevor (tutor) ; Magallanes Cedeño, Ricardo (asesor) ; Valle Mora, Javier Francisco (asesor) ;
Tapachula, Chiapas, México : El Colegio de la Frontera Sur , 1999
Clasificación: TE/633.1597 / P4
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
ECO010016350 (Disponible) , ECO010016349 (Disponible)
Disponibles para prestamo: 2
Cerrar
SIBE Tapachula
ECO020003107 (Disponible)
Disponibles para prestamo: 1
Resumen en: Inglés |
Resumen en inglés

1. A study performed on the Pacific coastal plain of Chiapas, Mexico focused on the prevalence of maize crop infestation by insect pests, the prevalence of parasitism of pests and the abundance of insect predators in maize plots with weeds compared to plots under a regime of rigorous weed control. Sampling was conducted on four occasions at 20, 32, 44 and 56 days post-planting. Data were subjected to repeated measures analysis. 2. Infestation of maize by fall armyworm larvae, Spodoptera frugiperda (Noctuidae), was overall twice as great in plots with strict weed control compared to weedy plots. The number of other phytophagous Lepidoptera, leafhoppers, phytophagous bugs and thrips was not significantly affected by the presence of weeds. The number of plants infested by aphids, fluctuated at each sample point whereas the prevalence of nitidulid beetles, was consistently lower in the presence of weeds. 3. The density of predatory Coleoptera on maize plants increased significantly in plots with weeds between the first and second sample points. The occurrence of other insect natural enemies (earwigs, lacewings, syrphids, ants etc.) on maize plants increased significantly during the study period but was not significantly affected by the weed control regime. 4. More than double the number of arthropods were captured in pitfall traps placed in weedy compared to weed-controlled plots. The overall capture of carabid beetles was significantly higher in weedy than in clean plots. 5. Overall levels of parasitism by Chelonus insularis (Braconidae) were 27.0% in clean blocks and 29.2% in weedy blocks. S. frugiperda egg masses placed in experimental plots at 23 days post-planting suffered significantly higher incidence of parasitism in clean plots (42.0%) compared to those placed in weedy plots (3.75%). 6. The presence of weeds did not affect maize plant height, the levels of plant damage, or the yield of grain from plants under each type of weed regime.