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Search Results: 1 - 10 of 9778 matches for " Rodolfo Velásquez-Valle "
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Incidencia y sintomatología de cinco virus en parcelas comerciales de chile seco en Aguascalientes, San Luis Potosí y Zacatecas, México
Velásquez-Valle, Rodolfo;Reveles-Torres, Luis Roberto;Mena-Covarrubias, Jaime;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: world-wide the chili pepper crop is affected by more than 60 viral diseases, although very little is known about them in the area of dry pepper plantation in northern-central mexico. consequently, the aims of this work were to identify the presence of the virus and the associated symptoms in commercial dry pepper fields of the states of zacatecas, san luis potosí, and aguascalientes, mexico. mirasol and ancho pepper plants were sampled and the presence of symptoms such as dwarfing, chlorosis, leaf deformation, defoliation, vascular necrosis and joined branches, were recorded. samples were analyzed using das-elisa with the antisera of the tobacco mosaic virus (tobacco mosaic virus: tmv), cucumber mosaic virus (cucumber mosaic virus: cmv), potato virus y (potato virus y: pvy), pepper mottle virus (pepper mottle virus: pepmov), and tobacco etch virus (tobacco etch virus: tev). these viruses were identified in pepper plants collected in dry pepper fields located in the three states mentioned earlier.
Incidencia y sintomatología de cinco virus en parcelas comerciales de chile seco en Aguascalientes, San Luis Potosí y Zacatecas, México Incidence and symptomatology of five viruses in commercial dry chili pepper fields in Aguascalientes, San Luis Potosí, and Zacatecas, Mexico
Rodolfo Velásquez-Valle,Luis Roberto Reveles-Torres,Jaime Mena-Covarrubias
Revista mexicana de ciencias agrícolas , 2012,
Abstract: A nivel mundial el cultivo de chile es afectado por más de 60 enfermedades virales; sin embargo, poco se conoce acerca de ellas en el área productora de chile seco del norte centro de México por lo que el objetivo del presente trabajo consistió en detectar la presencia y sintomatología de cinco virus en parcelas comerciales de chile seco en los estados mencionados. Plantas de chile de los tipos mirasol y ancho fueron muestreadas y se anotó la presencia de síntomas como enanismo, clorosis, deformación de hojas, defoliación, necrosis vascular y ramas unidas. Las muestras fueron analizadas mediante la técnica DAS-ELISA empleando los antisueros para el virus del mosaico del tabaco (Tobacco mosaic virus: TMV), mosaico del pepino (Cucumber mosaic virus: CMV), Y de la papa (Potato virus Y: PVY), moteado del chile (Pepper mottle virus: PepMoV) y jaspeado del tabaco (Tobacco etch virus: TEV). Esos virus fueron identificados en plantas de chile colectadas en las parcelas comerciales de chile seco de los tres estados antes mencionados. World-wide the chili pepper crop is affected by more than 60 viral diseases, although very little is known about them in the area of dry pepper plantation in northern-central Mexico. Consequently, the aims of this work were to identify the presence of the virus and the associated symptoms in commercial dry pepper fields of the states of Zacatecas, San Luis Potosí, and Aguascalientes, Mexico. Mirasol and ancho pepper plants were sampled and the presence of symptoms such as dwarfing, chlorosis, leaf deformation, defoliation, vascular necrosis and joined branches, were recorded. Samples were analyzed using DAS-ELISA with the antisera of the tobacco mosaic virus (Tobacco mosaic virus: TMV), cucumber mosaic virus (Cucumber mosaic virus: CMV), potato virus Y (Potato virus Y: PVY), pepper mottle virus (Pepper mottle virus: PepMoV), and tobacco etch virus (Tobacco etch virus: TEV). These viruses were identified in pepper plants collected in dry pepper fields located in the three states mentioned earlier.
"CEZAC 06": nueva variedad de ajo tipo Jaspeado para la región norte centro de México
Reveles-Hernández, Manuel;Velásquez-Valle, Rodolfo;Alvarado Nava, María Dolores;Rubio-Díaz, Salvador;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: about 5 200 hectares of garlic are cultivated in mexico; the north-central region is one of the main producing areas of this vegetable. the lack of locally adapted varieties of garlic is a serious disadvantage for garlic producers. in this paper are mentioned the main agronomic characteristics of "cezac 06", a new garlic variety available for producers of zacatecas, aguascalientes, durango, chihuahua and coahuila. the main advantages of this variety are higher yield, consistently round bulbs, fewer numbers of cloves per bulb and homogeneous maturation. in commercial plots, yield has improved in 9-17% and there have been achieved yields of up to 30 t ha-1 using "cezac 06".
"CEZAC 06": nueva variedad de ajo tipo Jaspeado para la región norte centro de México "CEZAC 06": new Jaspeado garlic cultivar for the northem-central region of Mexico
Manuel Reveles-Hernández,Rodolfo Velásquez-Valle,María Dolores Alvarado Nava,Salvador Rubio-Díaz
Revista mexicana de ciencias agrícolas , 2011,
Abstract: Alrededor de 5 200 hectáreas de ajo son cultivadas en México donde la región norte centro, es una de las principales áreas productoras de esta hortaliza. La falta de variedades de ajo localmente adaptadas es una seria desventaja para los productores de ajo. En este reporte se mencionan las principales características agronómicas de "CEZAC 06", una nueva variedad de ajo disponible para los productores de los estados de Zacatecas, Aguascalientes, Durango, Chihuahua y Coahuila. Las principales ventajas de esta variedad son rendimientos más altos, bulbos consistentemente redondos, menor número de dientes por bulbo y maduración homogénea. En parcelas comerciales el rendimiento se ha mejorado en 9-17% y se han alcanzado rendimientos de hasta 30 t ha-1 con el uso de "CEZAC 06". About 5 200 hectares of garlic are cultivated in Mexico; the north-central region is one of the main producing areas of this vegetable. The lack of locally adapted varieties of garlic is a serious disadvantage for garlic producers. In this paper are mentioned the main agronomic characteristics of "CEZAC 06", a new garlic variety available for producers of Zacatecas, Aguascalientes, Durango, Chihuahua and Coahuila. The main advantages of this variety are higher yield, consistently round bulbs, fewer numbers of cloves per bulb and homogeneous maturation. In commercial plots, yield has improved in 9-17% and there have been achieved yields of up to 30 t ha-1 using "CEZAC 06".
Presencia de Circulifer tenellus Baker y Beet mild curly top virus en maleza durante el invierno en el centro norte de México Circulifer tenellus Baker and Beet mild curly top virus presence in weeds during the winter in north-central Mexico
Rodolfo Velásquez-Valle,Luis Roberto Reveles-Torres,Mario Domingo Amador-Ramírez,María Mercedes Medina-Aguilar
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Una de las enfermedades más importantes del chile para secado en el norte centro de México es la denominada amarillamientos del chile. Existe poca información acerca de la interacción entre el vector (Circulifer tenellus Baker), el Beet mild curly top virus y la maleza durante el invierno en esta región, consecuentemente el objetivo del trabajo fue identificar maleza de invierno que sirve como refugio para el vector y hospedero del virus en esta región. Entre enero y marzo de 2011 se muestrearon 26 manchones de maleza en los estados de Aguascalientes y Zacatecas. Se capturaron adultos de C. tenellus en 69.2% de los manchones de maleza muestreados; la mayoría (75.5%) de los especímenes eran hembras. El Beet mild curly top fue identificado sólo 15.4% de los sitios de muestreo infectando especies de maleza como Eruca sativa, Reseda sp., Chenopodium sp. y Solanum rostratum L. One of the most important diseases of chili pepper for drying in the north-central Mexico is called yellowing of chili. There is little information about the interaction between the vector (Circulifer tenellus Baker), the Beet mild curly top virus and weeds during the winter in this region; therefore, the objective was to identify winter weeds that serve as are fuge for the vector and host of the virus in this region. Between January and March, 2011, 26 patches of weed were sampled in Aguascalientes and Zacatecas. Adult C. tenellus were captured in 69.2% of the weed sampled patches; most of the specimens were females (75.5%). Beet mild curly top was identified in only 15.4% of the sampling sites, infecting weed species suchas Eruca sativa, Reseda sp., Chenopodium sp. and Solanum rostratum L.
Microorganismos Benéficos Asociados a Meloidogyne incognita (Kofoid y White) Chitwood en Guayabo (Psidium guajava L.) de Calvillo, Aguascalientes, México
Gallegos-Morales, Gabriel;Cepeda-Siller, Melchor;Hernández-Castillo, Francisco Daniel;Acosta-Zamarripa, Ana María;Velásquez-Valle, Rodolfo;González-Gaona, Ernesto;Sánchez-Yánez, Juan Manuel;
Revista mexicana de fitopatología , 2009,
Abstract: the root-knot nematode species meloidogyne incognita was identified as the one species that parasites guava orchards in the calvillo region (aguascalientes, mexico). beneficent fungi and bacteria were isolated as well, associated to soil and roots collected from the cerro blanco, mesa grande, la labor and malpaso locations. twenty different meloidogyne sp., samples were identified taking adult female perinea pattern characteristics into account, as well as the male anterior region observation. the meloidogyne incognita species was identified in all the samples. the isolated beneficent microorganisms and associated to guava rhizosphere with a potential use in biological control, belong to the bacillus cereus, b. subtilis b. megaterium and paecilomyces farinosus species. furthermore, the rhabditis and mononchus soil nematodes were identified in the samples.
Mapping soil fractal dimension in agricultural fields with GPR
K. Oleschko, G. Korvin, A. Mu oz, J. Velazquez, M. E. Miranda, D. Carreon, L. Flores, M. Martínez, M. Velásquez-Valle, F. Brambila, J.-F. Parrot,G. Ronquillo
Nonlinear Processes in Geophysics (NPG) , 2008,
Abstract: We documented that the mapping of the fractal dimension of the backscattered Ground Penetrating Radar traces (Fractal Dimension Mapping, FDM) accomplished over heterogeneous agricultural fields gives statistically sound combined information about the spatial distribution of Andosol' dielectric permittivity, volumetric and gravimetric water content, bulk density, and mechanical resistance under seven different management systems. The roughness of the recorded traces was measured in terms of a single number H, the Hurst exponent, which integrates the competitive effects of volumetric water content, pore topology and mechanical resistance in space and time. We showed the suitability to combine the GPR traces fractal analysis with routine geostatistics (kriging) in order to map the spatial variation of soil properties by nondestructive techniques and to quantify precisely the differences under contrasting tillage systems. Three experimental plots with zero tillage and 33, 66 and 100% of crop residues imprinted the highest roughness to GPR wiggle traces (mean HR/S=0.15), significantly different to Andosol under conventional tillage (HR/S=0.47).
Epoca de aplicación y tipo de fertilizante nitrogenado sobre el patrón de acumulación de materia seca y nitrógeno del maíz en un Ultisol y un Mollisol de Venezuela1
Delgado,Rodolfo; Velásquez,Lorenzo; Cabrera de Bisbal,Evelyn;
Agronomía Tropical , 2004,
Abstract: types of n sources, and time of n-fertilizer application could affect n use and yield production of maize, zea mays l. in this experiment, maize response to application of 120 kg n ha-1 applied as urea, ammonium nitrate (an), and an ammonium source (10-26-26), and time of application of the sidedress was evaluated in an ultisol and in a mollisol of venezuela. normally there were more dry matter production, and n uptake under na. in the mollisol, early application of the n dose (the whole n at sowing or side dressing at 15 days) allowed more n uptake by the crop than late application of the element (sidedressing at 25 and 35 days).
Blastocistosis en pre-escolares de Ciudad Bolívar, Venezuela
Devera, Rodolfo Antonio;Velásquez, Virma Josefina;Vásquez, Maritza Justina;
Cadernos de Saúde Pública , 1998, DOI: 10.1590/S0102-311X1998000200024
Abstract: to evaluate the prevalence of blastocystis hominis and its clinical relevance, 169 preschool children from the "los coquitos" nursery school living in bolivar city, venezuela, were studied. stool samples were obtained and examined by direct microscopic examination, and the faust and willis concentration techniques. some 72 of the children had intestinal parasites, of whom 32 (29.09%) had b. hominis. prevalence for the latter was 18.93% ±5.93%. no differences were observed by sex or age (c2 = 1.84 df = 3; p>0.05). in the majority (53.13%) of the children, b. hominis was the only parasite. giardia lamblia was the parasite most frequently identified with b. hominis (39.13%). in 1994, in 12% of the cases more than five microorganisms per microscopic field were observed. clinical manifestations were observed in 70.58% of the preschool children. presence of parasites was not correlated with symptomatology, but only with severity. proper clinical and parasitological response to treatment was observed in 80% and 90% of patients, respectively. the conclusion was that b. hominis is a relatively frequent intestinal parasite among the preschool children evaluated.
Blastocistosis en pre-escolares de Ciudad Bolívar, Venezuela
Devera Rodolfo Antonio,Velásquez Virma Josefina,squez Maritza Justina
Cadernos de Saúde Pública , 1998,
Abstract: Para determinar la prevalencia y relevancia clínica de la blastocistosis en una muestra de ni os en edad pre-escolar, fueron evaluados 169 alumnos del pre-escolar "Los Coquitos" de Ciudad Bolívar, Venezuela. Las muestras fecales fueron estudiadas mediante la técnica de examen directo y métodos de concentración de Faust y Willis. Se encontraron 72 ni os parasitados, de ellos 32 (29,09%) con Blastocystis hominis. Se determinó una prevalencia de infección por este protozoario de 18,93% ± 5,93%. No hubo predilección por el sexo y la edad de los pre-escolares parasitados (ji2 = 1.84 DF = 3; p>0.05). Se diagnosticó mayormente como parásito único (53,13%); Giardia lamblia fue el parásito más frecuentemente identificado (39,13%) junto con B. hominis. En el 94,12% de los casos, se observó en un número mayor de 5 células por campo. El 70,58% de los pre-escolares tenía manifestaciones clínicas, sin embargo, la cantidad de Blastocystis presente no fue determinante en su aparición, pero si en la severidad de ellas. Luego del tratamiento, hubo respuesta clínica y parasitológica favorable en el 80% y 90% de los casos, respectivamente. Se concluye que B. hominis es un patógeno de relativa alta frecuencia en el grupo de ni os estudiados.
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