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5. Propuesta para obtener el tamaño de muestra óptimo de plagas con exceso de ceros

Author

Otero Prevost, Luis Gabriel, Villanueva Jiménez, Juan A., Ramírez Valverde, Gustavo, Vargas Mendoza, Mónica de la Cruz, Becerril Pérez, C. M., Soto Rojas, Lauro, Otero Prevost, Luis Gabriel, Villanueva Jiménez, Juan A., Ramírez Valverde, Gustavo, Vargas Mendoza, Mónica de la Cruz, Becerril Pérez, C. M., and Soto Rojas, Lauro

Abstract

In sampling of pests with low densities, it is common to obtain a large number of zeros, which is difficult to manage since the Poisson and negative binomial probability distributions are not suitable for modeling and equations to estimate the optimal sample size are not available. In this study model the excess of zeros by estimating parameters through the methods of moments and maximum likelihood of the zero-inflated Poisson and zero-inflated negative binomial distributions, and to derive equations to calculate the optimal sample size. Systematic sampling was used to select 100 trees per grove of Río Red grapefruit (Citrus paradisi Macfad) at Finca Sayula, Veracruz, Mexico (latitude 19.20722, longitude -96.35194), from June to July 2021 and January 2022. The number of leafminers (Phyllocnistis citrella Stainton) and aphids (Toxoptera citricida Kirkaldy) present in three leaves per shoot per tree, considered as a sample unit, was counted. Simulations were performed in RStudio with different proportions of zero (0.1, 0.4, and 0.6) to compare the parameters obtained in the field using the methods of moments and maximum likelihood. Equations were derived to estimate the optimal sample size in studies of pests with low densities, based on the zero-inflated Poisson and zero-inflated negative binomial probability distributions. The method of moments yields optimal sample sizes smaller than those obtained by maximum likelihood, because they distinguish the origin from zero, so its use is recommended., En muestreos de plagas con densidades bajas es común obtener gran cantidad de ceros, lo que es difícil de manejar, ya que las distribuciones de probabilidad Poisson y binomial negativa no son adecuadas para su modelación y no se dispone de ecuaciones para estimar el tamaño de muestra óptimo. En este estudio se modelo el exceso de ceros mediante la estimación de parámetros a través de los métodos de momentos y de máxima verosimilitud de las distribuciones Poisson cero inflado y binomial negativa cero inflado, y derivar ecuaciones para calcular el tamaño de muestra óptima. Se utilizó muestreo sistemático para seleccionar 100 árboles por huerto de toronja (Citrus paradisi Macfad) Río Red, en la Finca Sayula, Veracruz, México (latitud 19.20722, longitud -96.35194), de junio a julio 2021 y enero 2022. Se contó el número de minadores (Phyllocnistis citrella Stainton) y pulgones (Toxoptera citricida Kirkaldy) presentes en tres hojas por brote por árbol, consideradas como unidad muestral. Se realizaron simulaciones en RStudio con diferentes proporciones de cero (0.1, 0.4 y 0.6) para comparar los parámetros obtenidos en campo, mediante el método de los momentos y máxima verosimilitud. Se derivaron ecuaciones para estimar el tamaño de muestra óptimo en estudios de plagas con densidades bajas, a partir de las distribuciones de probabilidad Poisson cero inflado y binomial negativa cero inflado. El método de los momentos arroja tamaños de muestra óptimos menores a aquellos obtenidos mediante máxima verosimilitud, debido a que distinguen el origen del cero, por lo que se recomienda su uso.

Published
2024

9. Proposal to obtain the opmal sample size of pests with an excess of zeros.

Author

Otero-Prevost, Luis Gabriel, Villanueva-Jiménez, Juan A., Ramírez-Valverde, Gustavo, Vargas-Mendoza, Mónica C., Becerril-Pérez, Carlos M., and Soto-Rojas, Lauro

Abstract

In sampling of pests with low densities, it is common to obtain a large number of zeros, which is difficult to manage since the Poisson and negative binomial probability distributions are not suitable for modeling and equations to estimate the optimal sample size are not available. In this study model the excess of zeros by estimating parameters through the methods of moments and maximum likelihood of the zero-inflated Poisson and zero-inflated negative binomial distributions, and to derive equations to calculate the optimal sample size. Systematic sampling was used to select 100 trees per grove of Río Red grapefruit (Citrus paradisi Macfad) at Finca Sayula, Veracruz, Mexico (latitude 19.20722, longitude -96.35194), from June to July 2021 and January 2022. The number of leafminers (Phyllocnistis citrella Stainton) and aphids (Toxoptera citricida Kirkaldy) present in three leaves per shoot per tree, considered as a sample unit, was counted. Simulations were performed in RStudio with different proportions of zero (0.1, 0.4, and 0.6) to compare the parameters obtained in the field using the methods of moments and maximum likelihood. Equations were derived to estimate the optimal sample size in studies of pests with low densities, based on the zero-inflated Poisson and zero-inflated negative binomial probability distributions. The method of moments yields optimal sample sizes smaller than those obtained by maximum likelihood, because they distinguish the origin from zero, so its use is recommended. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Oribátidos, colémbolos y hormigas como indicadores de perturbación del suelo en sistemas de producción agrícola

Author

Cabrera-Mireles, Héctor, Murillo-Cuevas, Félix D., Villanueva Jiménez, Juan A., Adame García, Jacel, Cabrera-Mireles, Héctor, Murillo-Cuevas, Félix D., Villanueva Jiménez, Juan A., and Adame García, Jacel

Abstract

The abundance, richness and diversity of oribatids, collembola and ants were compared as indicators of soil disturbance found under (traditional) minimal management systems, transition management and technified handling of the mango crop, as well as in the technified management system of sugarcane in the Central Veracruz region in Mexico. In each management system, soil and litter samples were taken, in which arthropods were collected using the Berlese-Tullgren funnels method. The samplings were carried out in three seasons of the spring, summer and winter for 2017 and 2018. The most abundant species were the mites Ceratozetes sp., Archegozetes longisetosus, Scheloribates laticlava, Paropanolophus sp. and Pseudoparasitus sp., Collembola Pseudosinella sp. and Seira sp., and the ants Solenopsis conjurata, Solenopsis terricola, Pyramica brevicornis and Pachycondyla harpax. Colémbolos and ants were more abundant under the mínimum management system followed by management in transition, and finally in the systems of technified management of mango and sugarcane. On the other hand, the oribatids were more abundant in the management system of mango cultivation. The management system technified with sugar cane had an average of 12.3 individuals, 1.3 species and amount of 0.26 diversity, which was significantly lower than the other systems (abundance, F3,112 = 7.2, p = 0.0001, richness, F3,112 = 13.3, p = 0.0001, diversity, F3,112 = 13.2, p = 0.0001), which did not show significant differences among themselves (p > 0.05)., Se comparó la abundancia, riqueza y diversidad de oribátidos, colémbolos y hormigas como indicadores de perturbación del suelo encontrados bajo sistemas de manejo mínimo (tradicional), manejo en transición y manejo tecnificado del cultivo de mango, así como el sistema de manejo tecnificado de la caña de azúcar en la región Centro de Veracruz, México. En cada sistema de manejo se tomaron muestras de suelo y hojarasca, para colectar artrópodos mediante el método de embudos de Berlese-Tullgren. Los muestreos se realizaron en primavera, verano e invierno durante el 2017 y 2018. Las especies con mayor abundancia fueron los ácaros Ceratozetes sp., Archegozetes longisetosus, Scheloribates laticlava, Paropanolophus sp. y Pseudoparasitus sp., los colémbolos Pseudosinella sp. y Seira sp., y las hormigas Solenopsis conjurata, https://www.facebook.com/isastoppr/videos/2280266608886864colémbolos y hormigas fueron más abundantes bajo el sistema de manejo mínimo seguido por manejo en transición, y por último en los sistemas de manejo tecnificado de mango y caña de azúcar. En cambio, los oribátidos fueron más abundantes en el sistema de manejo tecnificado del cultivo de mango. El sistema de manejo tecnificado con caña de azúcar con promedio de 12.3 individuos, 1.3 especies y 0.26 de diversidad fue significativamente inferior a los otros sistemas (abundancia, F3,112 = 7.2, p = 0.0001; riqueza, F3,112 = 13.3, p = 0.0001; diversidad, F3,112 = 13.2, p = 0.0001), los cuales no presentaron diferencias significativas entre sí (p >0.05).

Published
2019

29. Small farmers' perception of factors influencing regional chemical control of Diaphorina citri.

Author

Pérez-Zarate, Luis Alfredo, Villanueva-Jiménez, Juan A., Osorio-Acosta, Francisco, Ortega-Arenas, Laura Delia, and Bustillo-García, Lissette C.

Subjects
*FARMERS, *SENSORY perception, *PEST control, *CITRUS greening disease, *INSECTICIDES
Abstract

Regional Control Areas (RCAs) have been implemented in Mexico as a strategy to delay the spread of Candidatus Liberibacter asiaticus, the causal bacterium of the disease known as Huanglongbing (HLB). The implementation of an effective management of the vector insect, Diaphorina citri in the RCAs requires the knowledge, acceptance and coordinated engagement of small agricultural producers. This research assessed the perception and knowledge of 62 citrus growers regarding the operational, sociocultural and environmental factors influencing chemical control of D. citri in four RCAs within Veracruz State. According to their responses, the following factors have been identified as the operational factors with the highest influence on the effectiveness of insecticides against D. citri within RCAs: the lack of knowledge about the use of surfactants, application speed, poor calibration of sprayers and incorrect water quality. The most significant sociocultural factors are the general unawareness of the pest and the safe and proper application of pesticides. The most relevant environmental factors during application: temperature, relative humidity, and wind speed. Sociocultural index correlated with the perception of effectiveness. Therefore, it becomes necessary to consider differences among citrus growers in each region and setting out the most appropriate strategies for vector and disease management. [ABSTRACT FROM AUTHOR]

Published
2020

33. Development of functional cookies with wheat flour, banana flour (Musa paradisiaca), sesame seeds (Sesamum indicum) and storage stability

Author

Loza, Angélica, Quispe, Merly, Villanueva Jiménez, Juan A., Peláez Puerto, Pedro, Loza, Angélica, Quispe, Merly, Villanueva Jiménez, Juan A., and Peláez Puerto, Pedro

Abstract

Functional cookies were developed using banana flour (BF) and sesame seeds (SS). Protein, moisture and ash were determined, and farinographic analyzes of flours were performed. The attributes odor, color, flavor, crunch and the IC50 value of the cookies were determined. The results were evaluated with the Complete Randomized Design and the Tukey and Kruskall Wallis test. The flour mixture presented higher protein (10.2%), humidity (14.40%) than BF, but lower than wheat flour. Cookies with 10%, 15% and 20% BF and 8% sesame seeds were selected. Flours with 10%, 15% and 20% BF had similar values of water absorption (≤ 60%) and different values statistically (p ≤ 0.05) for development time, mass stability and degree of softening. Cookies with 20% BF and 8% SS (SC) had IC50 = 17.52 ± 0.25 mg / mL, with moisture, protein, fat, crude fiber, ash and carbohydrates of 1.88%, 10.65%, 22.01%, 1.01%, 1.54% and 62.91%, respectively. SC did not present sensorial statistical differences (p ≤ 0.05) the first two months, the third month decreased the acceptability of the crunch and flavor. In ninety days of storage the IC50 value (29.07 ± 0.92 mg / mL), reducing sugars (1.20 ± 0.02) and pH (5.24 ± 0.01) decreased and humidity (3.83 ± 0.03) increased.

Published
2017

34. Efecto biológico del aceite de Tagetes coronopifolia (Asteraceae) contra Diaphorina citri(Hemiptera: Liviidae)

Author

MENDOZA-GARCÍA, EDGAR E., ORTEGA-ARENAS, LAURA D., SERRATO CRUZ, MIGUEL A., DÍAZ CEDILLO, FRANCISCO, VILLANUEVA-JIMÉNEZ, JUAN A., LÓPEZ-ARROYO, J. ISABEL, and PÉREZ-PACHECO, RAFAEL

Subjects
Plantas insecticidas, Aceite esencial, Life cycle, Mortalidad, Insecticide plants, Psílido asiático de los cítricos, Essential oil, Repelencia
Abstract

En el presente estudio se determinó la actividad tóxica y repelente del aceite de Tagetes coronopifolia contra Diaphorina citri(Hemiptera: Liviidae). El aceite de T. coronopifolia se obtuvo de la parte área de un ecotipo de Texcoco, México, la cual se procesó mediante hidrodestilación. La toxicidad se evaluó mediante la exposición de adultos y ninfas a diferentes concentraciones del aceite mediante aspersión e inmersión de discos de hoja de Citrus sinensis cv Valencia. La repelencia se determinó al exponer adultos, confinados en un dispositivo, a una hoja tratada, a las 4, 5, 6 y 24 h post- aplicación. Los adultos y ninfas resultaron significativamente susceptibles al aceite de T. coronopifolia (P < 0,05), la mortalidad se incrementó con la concentración y el tiempo de exposición. La toxicidad del aceite > 40% se presentó a partir de 0,01 mg mL-1 en ninfas, mientras que en adultos fue a partir de 10 mg mL-1. El aceite de T. coronopifolia mostró el máximo efecto repelente (92%) con 40 mg mL-1 a 4 h posteriores al tratamiento, aunque disminuyó a las 24 h. In this study the toxicity and repellent activity of Tagetes coronopifolia essential oil was determined against Diaphorina citri(Hemiptera: Liviidae). T. coronopifolia oil was obtained from the aerial part of an ecotype from Texcoco, Mexico, and processed by hydrodistillation. Nymphs and adults were sprayed with several oil concentrations, and also exposed to Citrus sinensis cv. Valencia leaf discs treated by immersion. Mortality was assessed in both bioassays. Repellency was evaluated by exposing adults to a treated leaf confined in a device at 4, 5, 6 and 24 hours after application. Adults and nymphs were significantly susceptible to T. coronopifolia oil (P < 0.05), mortality increased with concentration and time of exposure. In nymphs, oil toxicity > 40% was observed starting at 0.01 mg mL-1, while in adults, it started at 10 mg mL-1. T. coronopifolia oil caused maximum repellency (92%) with 40 mg mL-1, 4 hours after treatment, but decreased at 24 hours.

Published
2015

39. Investigación participativa y redes de innovación en agroecosistemas con papayo en Cotaxtla, Veracruz, México.

Author

Cano-Reyes, Octavio, Villanueva Jiménez, Juan A., Reta Mendiola, Juan L., Huerta de la Peña, Arturo, Zarazúa, José Alberto, Cano-Reyes, Octavio, Villanueva Jiménez, Juan A., Reta Mendiola, Juan L., Huerta de la Peña, Arturo, and Zarazúa, José Alberto

Abstract

The analysis of social networks can be applied to processes of rural innovation in technology transference. It helps to understand the complexity of social relationships that people or institutions form within their environment, and define the innovation networks that arise between work groups or regions. From April to May, 2011, the networks and central actors present in the association “Productora y Comercializadora de Papaya de Cotaxtla, S.P.R de R.L.” were established, which influences technology transfer in Cotaxtla, Veracruz, México. Three centrality measures were determined with the UCINET software v. 6.289: degree, betweenness and closeness. Of 32 participants in the network, 27 actively divulge the innovations according to their interest, with those with whom they must make alliances to transfer technology. Four producers stand out as central actors, which together with INIFAP, Colegio de Postgraduados and the producers’ organization itself, would be the appropriate ones to develop a technology transfer program to accelerate the diffusion and adoption of innovations. Wholesale traders, intermediaries and credit institutions do not participate in this process, but they could provide funds to finance the diffusion of innovations., El análisis de redes sociales puede ser aplicado a procesos de innovación rural en la transferencia de tecnología. Sirve para entender la complejidad de las relaciones sociales que forman las personas o instituciones en su entorno y definen las redes de innovación que se dan entre grupos de trabajo o regiones. De abril a mayo de 2011 se determinaron las redes y actores centrales presentes en la asociación “Productora y Comercia-lizadora de Papaya de Cotaxtla S.P.R. de R.L.”, que influyen en la transferencia de tecnología en Cotaxtla, Veracruz, Méxi-co. Mediante el programa UCINET v. 6.289 se determinaron tres medidas de centralidad: rango, grado de intermediación y cercanía. De 32 participantes en la red, 27 difunden acti-vamente las innovaciones de acuerdo con su interés, con los que se deben hacer alianzas para transferir tecnología. Cuatro productores resaltan como actores centrales, que junto con el INIFAP, el Colegio de Postgraduados y la propia organi-zación de productores, serían los apropiados para establecer un programa de transferencia de tecnología para acelerar la difusión y adopción de las innovaciones. Los comercializa-dores mayoristas, intermediarios e instituciones de crédito no participan en este proceso, pero podrían proveer fondos para financiar la difusión de innovaciones.

Published
2015

41. La influencia de la responsabilidad social empresarial en el comportamiento de compra de los consumidores del segmento hombres de 18 a 24 años en el rubro de perfumes de la ciudad de Lima - Perú

Author

Anicama Bravo, José Alfredo, León Pumacallao, José Luis, Sandoval Zea, Otto Oswaldo, Villanueva Jiménez, Juan José, and Benzaquen de las Casas, Jorge Benny

Subjects
Investigación cuantitativa, Responsabilidad social de las empresas, Comportamiento del consumidor
Abstract

La investigación se realizó en la ciudad de Lima entre los meses de junio y setiembre del 2013, sobre la base de una muestra por conveniencia de consumidores hombres de 18 a 24 años de edad. Su propósito fue determinar si existía una relación significativa entre la responsabilidad social empresarial (RSE), las competencias corporativas (CC) y el consumo socialmente responsable (CnSR) de los consumidores hombres de 18 a 24 años a nivel de Lima. Además, se buscó medir la preferencia de los consumidores en términos de su intención de compra y disposición a pagar (DAP). El estudio se justificó por su valor teórico en países en vías de desarrollo, relevancia social y académica, y por los beneficios económicos que proporciona a la clase empresarial al medir el impacto de sus acciones de RSE en el comportamiento de compra del consumidor peruano a nivel de Lima. Los resultados sugieren que los entrevistados, para el caso del producto perfume, valoran el compromiso con el medio ambiente como el atributo más importante de la RSE y la calidad como el atributo más importante de las CC, por lo que se concluye que cada uno de los atributos de la RSE y de las CC está relacionado significativamente con el CnSR. Esta tesis es una ampliación del alcance de la investigación doctoral del profesor Percy Samoel Marquina Feldman, La Influencia de la Responsabilidad Social Empresarial en el Comportamiento de Compra de los Consumidores Peruanos (Marquina, 2009). Esta tesis de maestría busca validar si la relación identificada originalmente por el profesor Marquina también se presenta en la categoría de perfumes, tal como el autor lo sugirió en sus recomendaciones finales. Con la autorización del autor, se ha utilizado partes de su tesis, particularmente en lo concerniente a la revisión de la literatura y el método. The study was carried out in the city of Lima between the months of June and September 2013, using a convenience sample of male consumers between 18 and 24 years old. The objective was to determine if there existed a significant relationship between corporate social responsibility (CSR), the corporate competencies (CC) and socially responsible consumption (SRC) of the male consumers between 18 and 24 years old at the city of Lima. In addition, the preference was also measured in relation to their purchasing intention and the disposition to pay (DTP). The study was justified by its theoretical value in developing countries, social and academic relevance and by the economic benefits that they provide to the entrepreneurial class by measuring the impact of the CSR actions in the purchasing behavior of the Peruvian consumer. The results suggest that the interviewed, for the case of the product perfume, value the commitment to the environment as the most important attribute of the CSR and the quality as the most important attribute of the CC, with the conclusion being that each of the attributes of the CSR an CC are significantly and positively related to the SRC. The present study is an extension of the scope of the doctoral investigation of Professor Percy Marquina Feldman, known as The Influence of the Corporate Social Responsibility in the Purchasing Behavior of Peruvian Consumers (Marquina 2009). This study looks to validate if the relationship originally identified by the author is also present in the category of perfumes, just as the author suggested in his final recommendations. With the authorization of the author, a part of his thesis has been used especially that concerning the revision of the literature and the methodology. Tesis

Published
2013

42. Interactions between entomopathogenic fungi and Tamarixia radiata (Hymenoptera: Eulophidae) in Diaphorina citri (Hemiptera: Liviidae) populations under laboratory conditions.

Author

Ibarra-Cortés, Karla H., González-Hernández, Héctor, Guzmán-Franco, Ariel W., Ortega-Arenas, Laura D., Villanueva-Jiménez, Juan A., and Robles-Bermúdez, Agustín

Subjects
ENTOMOPATHOGENIC fungi, EULOPHIDAE, INSECT populations, BIOLOGICAL control of insects, PARASITISM
Abstract

Biological control of Diaphorina citri (Kuwayama) using the parasitoid Tamarixia radiata (Waterston) or entomopathogenic fungi has been attempted, but there have been few published studies on their potential interactions when used together. We studied the effect of prior residency time on the outcomes of interactions between T. radiata and the fungal pathogens Beauveria bassiana and Metarhizium anisopliae in D. citri nymphs. In the first experiment, nymphs infected with fungi were exposed to the parasitoid after 0, 24 and 72 h. Next, nymphs with parasitoids at different developmental stages (eggs, larvae or pupae) were exposed to fungal inoculation. The greatest proportion of fungus-infected nymphs occurred when they were inoculated 72 h prior to parasitoid exposure. The lowest parasitism rate occurred in nymphs that had been infected by fungi 72 h prior to parasitoid exposure. The number of nymphs used for host-feeding by the parasitoid was similar, regardless of how advanced the fungal infection was. When fungal inoculations were made to parasitized nymphs with different developmental stages of the parasitoid, the greatest proportion becoming infected occurred in nymphs with parasitoid eggs. The overall longevity of adult parasitoids emerging from control and fungal-infected treatments was similar; however, the longevity of adult parasitoids emerging from nymphs which had been inoculated with parasitoid larvae were lowest, with the greatest effect observed for the M. anisopliae isolate. The ecological importance and practical recommendations derived from our results are discussed. [ABSTRACT FROM AUTHOR]

Published
2018
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43. Nuevos registros de aleyrodidae y diaspididae (Hemiptera: Sternorrhyncha) en plantaciones de naranja (Citrus Sinensis l.) de la Chontalpa, Tabasco, México

Author

Peralta Gamas, Marcelino, Villanueva Jiménez, Juan Antonio, Sánchez Soto, Saúl, Ortiz García, Fredy, and Nikolaevna Myartseva, Svetlana

Subjects
Moscas Blancas, Escamas Armadas, Plagas de la Naranja, Entomología Agrícola
Abstract

Se reportan nuevos registros de Aleurocanthus woglumi Ashby, Aleurothrixus floccosus (Maskell) y Unaspis citri (Comstock) atacando plantaciones de naranja en la región Chontalpa, Tabasco, México.

Published
2011

45. Incremento de productividad y reducción de costos en la mina Arcata, por la aplicación de taladros largos en vetas angostas

Author

Villanueva Jiménez, Juan José and Valencia Chávez, Elvis William

Subjects
Productividad minera, Taladros, Vetas mineras
Abstract

En la Introducción se presenta las condiciones encontradas en la operación de la mina que motivo a llevar a cabo esta aplicación de minado. Asimismo, se explica los objetivos que se propone alcanzar. En el Capítulo I se da a conocer los Aspectos Generales y la estructura del funcionamiento de la Mina. Al final se detalla el trabajo de las áreas operativas y de Servicios a la Mina. En el Capítulo II se presenta los Aspectos Geológicos del yacimiento para explicar el comportamiento de las estructuras mineralizadas del Distrito Minero Arcata, y asociar vetas potenciales con condiciones para la aplicación del método de minado propuesto. En el Capítulo III se describe el sistema de explotación tradicional de la Mina Arcata que ha venido aplicándose en los últimos 5 años, incidiendo a detalle en el ciclo de minado, para identificar oportunidades de mejora. Se explican las operaciones unitarias de la explotación, el manejo de los recursos y destinos de los materiales de la explotación. En el Capítulo IV, se presenta la propuesta de la aplicación del método de minado tajea por subniveles con Taladros Largos, consideraciones generales y específicas para la aplicación del método, asimismo los filtros a las estructuras mineralizadas para la preparación de los tajos. Recursos y sus controles respectivos: equipos, mano de obra, materiales. En el Capítulo V se presentan el análisis y los cálculos de costos, para sustentar la aplicabilidad del método propuesto en los sectores que cumplan los parámetros de diseño. Se presentan los cuadros comparativos entre el método propuesto y el minado clásico de la mina. Asimismo, se comparan los de indicadores de Productividad. Las Conclusiones y Recomendaciones derivadas a partir del desarrollo e implementación del método propuesto en la Mina Arcata, que puedan servir de base a futuros estudios sobre este método de minado, o también de modelo para yacimientos que cumplan el estándar de diseño expuesto. Finalmente, los anexos que detallan los procedimientos de trabajo y costos base, ilustran los diseños en planos y estándar de minado, y los sustentos geomecánicos del método propuesto. Trabajo de suficiencia profesional

Published
2010

47. Life Cycle and Larval Predation by Ceraeochrysa valida (Banks)1 on Nymphs of Diaphorina citri Kuwayama2.

Author

Jose-Pablo, Rosaura, Villanueva-Jiménez, Juan A., Vargas-Mendoza, Mónica De La Cruz, and Huerta-De-La-Peña, Arturo

Subjects
*JUMPING plant-lice, *INSECT eggs, *NYMPHS (Insects), *ORCHARDS, *PREDATORY animals
Abstract

Area-wide management of Asian citrus psyllid, Diaphorina citri Kuwayama, might use predators abundant in citrus orchards, making necessary the assessment of local predatory species such as Ceraeochrysa valida (Banks). The objective of the study was to determine the life cycle of C. valida under different rearing conditions; its fecundity, survival, and longevity; and its predatory capacity on different larval instars of D. citri, both in the laboratory and greenhouse. Predators and pests were reared from insects collected in citrus orchards in the central coastal area of Veracruz, Mexico. Developmental time for C. valida eggs; larvae 1, 2, and 3; and prepupae-pupae were 5.5 ± 0.7, 6.5 ± 0.7, 5.0 ± 1.0, 7.0 ± 1.0, and 14.5 ± 0.7 days, respectively. Male and female longevities were 74.0 ± 38.9 and 78.0 ± 28.9 days. Mean daily number of eggs per female was 10.0 ± 8.4. Predation in the laboratory and greenhouse was greater on older larvae ( P < 0.0001) regardless of the nymphal stages consumed. In the laboratory, C. valida consumed as many as 368 prey in 48 hours. However, consumption in a greenhouse was not as much as in the laboratory during the first 6 hours. [ABSTRACT FROM AUTHOR]

Published
2017
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49. Las Variedades del Chayote (Sechium edule (Jacq.) Sw.) y su Comercio Mundial

Author

Villanueva Jiménez, Juan A. and Villanueva Jiménez, Juan A.

Abstract

The Colegio de Postgraduados publishing house and Mundi Prensa México present various aspects of “chayotli” or spine-free squash, in a compact volume of only 98 pages, which belongs to the successful series, Biblioteca Básica de Agricultura (Basic Agriculture Library). Although the book indicates within its covers that it was published in 2011, it was presented to the public in August 2012.In this book, Jorge Cadena Íñiguez and Ma. De Lourdes C. Arévalo Galarza, guide us on the journey travelled by these two professors-researchers of the Colegio de Postgraduados, together with their collaborators, for the Research Priority Lines, “Harmlessness, Quality of Foods and Biosafety” and “Agrarian Rural Communities, Ejidos and Local Knowledge”, as well as in their Interdisciplinary Research Group on Sechium edule (GISEM, A.C.)., La Editorial del Colegio de Postgraduados y Mundi Prensa México presentan diversos aspectos del “chayotli” o calabaza sin espinas, en un volumen compacto de apenas 98 páginas, perteneciente a la exitosa serie Biblioteca Básica de Agricultura. A pesar de que el libro indica en su interior como año de publicación 2011, fue entregado al público en agosto de 2012.En él, Jorge Cadena Íñiguez y Ma. De Lourdes C. Arévalo Galarza, nos llevan de la mano en una aventura recorrida por estos dos profesores investigadores del propio Colegio de Postgraduados, junto con sus colaboradores de las Líneas Prioritarias de Investigación “Inocuidad, Calidad de Alimentos y Bioseguridad” y “Comunidades Rurales Agrarias, Ejidos y Conocimiento Local”, así como de su Grupo Interdisciplinario de Investigación en Sechium edule (GISEM, A.C).

Published
2012

50. SUSCEPTIBILIDAD DE Diaphorina citri KUWAYAMA (HEMIPTERA: LIVIIDAE) A INSECTICIDAS EN VERACRUZ, MÉXICO.

Author

García-Méndez, Víctor H., Ortega-Arenas, Laura D., Villanueva-Jiménez, Juan A., and Sánchez-Arroyo, Hussein

Subjects
CITRUS greening disease, IMIDACLOPRID, PROBIT analysis, R factors, PREVENTION, THERAPEUTICS
Abstract

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Published
2016

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