University Jurez Del Estado Of Durango

Venecia, Mexico

University Jurez Del Estado Of Durango

Venecia, Mexico
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Lvarez-Zagoya R.,Instituto Politcnico Nacional | Carrillo-Parra A.,University Jurez Del Estado Of Durango | Corral-Rivas J.J.,Autonomous University of Nuevo León
Southwestern Entomologist | Year: 2012

Insects that affect the quality of seeds in three seed stands of Pinus engelmannii Carr in the state of Durango, Mexico, were identified and quantified. Ten trees at each of the three sites were randomly selected, and the seeds were collected from each of 10 fully developed cones. From the total seeds harvested, 400 were randomly selected and subjected to X-ray analysis to quantify whether seeds were filled, empty, or damaged by insects. The main factors that affected seed quality were poor pollination and pest attack, especially by Leptoglossus occidentalis Heidemann. Most seeds were damaged by pests at El Encinal (42.8%) and fewest at Las Cumbres (19.4%). Damage caused by the insect Cydia latisigna Miller occurred more frequently at El Encinal (5.0%) and less frequently at Las Cumbres (2.2%). Megastigmus albifrons Walker was found most frequently at La Florida (1.1%); at Las Cumbres, no damage was caused by this insect. The greatest damage caused by Leptoglossus was observed at El Encinal (1.3%), and minor damage occurred at Las Cumbres and La Florida (0.5). Most damaged seeds were at El Encinal (61.7%), while least were at Las Cumbres (22.8%). These results showed the seed bug (L. occidentalis) is the agent that causes major damage as seeds develop.

Nava-Camberos U.,University Jurez Del Estado Of Durango | Avila-Rodrguez V.,University Jurez Del Estado Of Durango | Avila-Rodrguez V.,Universidad Juárez del Estado de Durango | Martinez-Carrillo J.L.,University Jurez Del Estado Of Durango | Martinez-Carrillo J.L.,Sonora Institute of Technology
Southwestern Entomologist | Year: 2010

The pink bollworm, Pectinophora gossypiella (Saunders), is a primary pest of cotton, Gossypium hirsutum L., in Mexico. Baseline and diagnostic concentration bioassays were used to determine the susceptibility of this pest to Becillus thuringiensis (Berliner) toxins Cry1Ac and Cry2Ab in different cotton-growing regions of Mexico, during 19982006. The LC50 values varied depending on the region and collection date or generation of insect. Pink bollworm populations from the Mexicali Valley, Baja California, were the most susceptible. In general, results obtained showed no indication of resistance by this insect in Mexico.

Lopez-Romero E.,University of Guanajuato | Reyes-Montes M.D.R.,National University of Costa Rica | Perez-Torres A.,National University of Costa Rica | Ruiz-Baca E.,University Jurez Del Estado Of Durango | And 4 more authors.
Future Microbiology | Year: 2011

Sporothrix schenckii, now named the S. schenckii species complex, has largely been known as the etiological agent of sporotrichosis, which is an acute or chronic subcutaneous mycosis of humans and other mammals. Gene sequencing has revealed the following species in the S. schenckii complex: Sporothrix albicans, Sporothrix brasiliensis, Sporothrix globosa, Sporothrix luriei, Sporothrix mexicana and S. schenckii. The increasing number of reports of Sporothrix infection in immunocompromised patients, mainly the HIV-infected population, suggests sporotrichosis as an emerging global health problem concomitant with the AIDS pandemic. Molecular studies have demonstrated a high level of intraspecific variability. Components of the S. schenckii cell wall that act as adhesins and immunogenic inducers, such as a 70-kDa glycoprotein, are apparently specific to this fungus. The main glycan peptidorhamnomannan cell wall component is the only O-linked glycan structure known in S. schenckii. It contains an α-mannobiose core followed by one α-glucuronic acid unit, which may be mono- or di-rhamnosylated. The oligomeric structure of glucosamine-6-P synthase has led to a significant advance in the development of antifungals targeted to the enzymes catalytic domain in S. schenckii. © 2011 Future Medicine Ltd.

Perez G.M.,Autonomous University of Nuevo León | Perez G.M.,University Jurez Del Estado Of Durango | Salas J.S.,Autonomous University of Nuevo León | Salas J.S.,University Jurez Del Estado Of Durango | And 2 more authors.
Southwestern Naturalist | Year: 2012

Peniocereus greggii variety greggii is a protected species that is collected illegally in Parque Estatal Can de Fernandez. It is associated with fertility islands formed by mesquites Prosopis glandulosa and P. laevigata. It has a root that is used as food, it can be used to treat kidney problems, and it is a cardiac stimulant.

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