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Azuara-Dominguez A.,Altamira Institute of Technology | Cibrian-Tovar J.,Colegio de Mexico | Teran-Vargas A.P.,INIFAP | Segura-Leon O.L.,Colegio de Mexico | Cibrian-Jaramillo A.,CINVESTAV
Southwestern Entomologist | Year: 2013

The agave weevil, Scyphophorus acupunctatus Gyllenhal (Coleoptera: Curculionidae), causes economic damage to Agave tequilana F.A.C Weber var. 'Blue', A. fourcroydes Lem., A. angustifolia Haw, and Polianthes tuberosa Lem. Currently, the synthetic compound 2-methyl-4-octanone is used to monitor S. acupunctatus, but factors involved in chemical communication by S. acupunctatus need to be better understood. We used electroantennography, olfactometer bioassays, and analysis of the COI mitochondrial region to study the effect of sex, age, and genetic structure on the electrophysiological response and search behavior by S. acupunctatus to 2-methyl-4-octanone. We showed that electrophysiological and behavioral response to 2-methyl-4-octanone differed among populations of agave weevils from different crops and geographical regions. Furthermore, it was determined that the age of the insect was involved in both responses. Also, genetic changes in mitochondrial DNA suggest groups that differ in their response of S. acupunctatus to 2-methyl-4-octanone. This information provides a baseline to design a method to control agave weevil based on geographical region and type of host. Source


Romero-Trevino E.M.,Altamira Institute of Technology | Gutierrez-Ornelas E.,Autonomous University of Nuevo Leon | Bernal-Barragan H.,Autonomous University of Nuevo Leon | Martinez-Gonzalez J.C.,Autonomous University of Tamaulipas | And 2 more authors.
Livestock Research for Rural Development | Year: 2011

The objective was to evaluate the seasonal variations in production and quality of four grasses, as well as the body score condition (BSC) and metabolite concentration in blood serum of lactating dual purpose cows from the North of Veracruz, Mexico. Samples of four grasses were collected every 28 days they and processed to determine dry matter (DM) production, crude protein (CP) and neutral detergent fiber (NDF). In addition, blood samples of 25 lactating cows were obtained, to determine the BSC and the glucose and urea nitrogen serum concentration. Production values for DM, CP and NDF were 908 kg ha-1, 7.6 and 78.3%, respectively. In spring, DM was greater (1230 kg ha -1) than in winter (450 kg ha-1), a similar situation observed for NDF (P<0.05). In addition, CP content, within season was affected (P<0.05) by grass species. Pangola grass samples showed the smallest CP concentrations (4.6%) in winter. Mean BSC was 4.4, and it was affected (P<0.05) by season. During the summer the cows showed the lowest BSC (3.3). The concentrations of glucose and urea nitrogen were affected by the season (P<0.05), being highest in winter with 74.2 and 20.0 mg dL -1, respectively. The DM yield for hectare was smaller in winter and the grass CP content was not modified by the season. The metabolic profiles of glucose and urea nitrogen were within the established ranges for lactating grazing cows. Source


Dominguez A.A.,Altamira Institute of Technology | Vargas A.P.T.,Campo Experimental Las Huastecas | Sandoval A.S.,National Autonomous University of Mexico | Paniagua N.Y.A.,National Autonomous University of Mexico | Bolanos L.M.,National Autonomous University of Mexico
Entomotropica | Year: 2014

In order to establish a trapping program for the agave weevil (Scyphophorus acupunctatus Gyllenhal) in Tamaulipas, Mexico, were evaluated three types of traps (tray, carafe and stake) in combination with food attractants (molasses and agave tequila) and pheromone aggregation. The treatments were evaluated from January to December 2010. The specimens captured were sexed to determine if the sex of S. acupunctatus influences in the trapping. The trap type carafe was the best design in the capture of S. acupunctatus (F = 85.7, df = 2, P = 0.0001). The combination of food bait (molasses and fermented agave) and aggregation pheromone trap type incorporated into the carafe was the best combination to attract adults of S. acupunctatus. The potential use of female trapping of S. acupunctatus using food attractants and aggregation pheromone is discussed. © 2014, Sociedad Venezolana de Entomología. Source

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