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Río Bravo, Mexico

Grageda-Cabrera O.A.,Campo experimental Bajio | Gonzalez-Figueroa S.S.,Campo experimental Bajio | Solis-Moya E.,Campo experimental Bajio | Lozano-Contreras M.G.,INIFAP Campo Experimental Mococha | Diaz-Franco A.,Campo Experimental Rio Bravo
Tropical and Subtropical Agroecosystems

The effect of the treatment with the fungicide chlorothalonil on radical mycorrhizal colonization on barley seed was evaluated. An experiment was performed, the factors were as follows: 1) Mycorrhiza INIFAP® (uninoculated, one, two and three doses) and fungicide (with and without fungicide). Monthly sowings were conducted to determine the degree of colonization in the roots. The results showed that treatment of the seed with chlorothalonil was not significantly decreased by the radical mycorrhizal INIFAP® colonization, chlorothalonil treatment had a mean of 32.63% root infection whereas without chlorothalonil was 36.46%. When the seed was treated with chlorothalonil, the more affected in terms of root colonization by mycorrhizal INIFAP® was a dose, treatment with double and triple doses showed no significant difference between them. Storage of seed infection percentage decreased progressively. Through the time of the inoculated seed storage, root infection by mycorrhizal INIFAP® remained constant and unchanged for the first six months, but then decreased at ca. 50% over a period of 10 months, when treated or not treated with fungicide. Source

Pena-del-Rio M.A.,Instituto Nacional de Investigaciones Nucleares | Maldonado-Moreno N.,Altamira | Diaz-Franco A.,Campo Experimental Rio Bravo
Revista Fitotecnia Mexicana

Asian soybean rust (Phakopsora pachyrhizi), appeared in México in 2005. Commonly sowed commercial cultivars have shown susceptibility to the pathogen, therefore this study searched for sources of genetic resistance to the disease by field evaluation of 197 soybean genotypes. Plants were sowed at two planting dates (24-Feb and 24-Apr, 2007) and inoculated during flowering initiation. Disease severity was measured during the R6 stage, using a rating scale from 1 (0 %) to 3 (> 30 %). Twenty-three soybean genotypes were identified as resistant to P. pachyrhizi and did not show leaf damage at either planting date. Source

Velazquez G.,Autonomous University of Tamaulipas | Candelario H.E.,Autonomous University of Tamaulipas | Ramirez J.A.,Autonomous University of Tamaulipas | Mangan R.L.,U.S. Department of Agriculture | And 2 more authors.
Foodborne Pathogens and Disease

Application of high hydrostatic pressure has been proposed as an alternative quarantine process for the Mexican fruit fly, Anastrepha ludens Loew (Diptera: Tephritidae), one of the most important insects infesting mangoes, citrus fruits, and other fruits in Mexico and other Latin American countries. The present study was performed to determine the effect of high pressure treatments at 0°C on the survivorship of eggs and larvae of this pest. The effect of time and pressure level at near-freezing temperatures on the egg hatch and survival of larvae is discussed. Eggs and larvae were pressurized at 25, 50, 75, 100, or 150MPa for 0, 5, 10, or 20min at 0°C. Hatch was recorded for 1-, 2-, 3-, and 4-day-old pressurized eggs. For pressurized larvae (first, second, and third instars), percentage of survival was registered. Further, third instars were studied for their ability to pupate and develop to adulthood. The results showed that eggs had higher resistance than larvae to pressure. Larvae were not able to resist pressure treatments at 75MPa for 20min at 0°C. Treatments at 150MPa for 20min at 0°C were needed to destroy all eggs and larvae of A. ludens, indicating that this process might be useful as a quarantine method for infested fruits. However, more studies involving combination of high hydrostatic pressure at low temperature with precooling treatments are needed in order to decrease the pressure level to avoid fruit damage. Copyright 2010, Mary Ann Liebert, Inc. Source

Williams Alanis H.,Autonomous University of Nuevo Leon | Pecina Quintero V.,Instituto Nacional Of Investigaciones Forestales Agricolas Y Pecuarias Inifap | Zavala Garcia F.,Autonomous University of Nuevo Leon | Montes Garcia N.,Campo Experimental Rio Bravo | And 5 more authors.
Revista Fitotecnia Mexicana

To assess grain yield and stability of sorghum genotypes of (Sorghum bicolor L. Moench), 44 hybrids were sowed in 16 environments during 2001 and 2002 in the states of Tamaulipas, Nuevo León and Coahuila, México. The genotype-environment interaction was estimated by the Finlay and Wilkinson is regression model and by the additive main effects and multiplicative interaction model (AMMI). The AMMI model was more effective for characterizing the behavior of the studied genotypes, than Finlay and Wilkinson is regression analysis. The first four principal components (ACP) of the AMMI model were significant (P < 0.01) and explained 28, 19, 10 and 9 % of the sum of squares of the interaction. In total, the AMMI model retained 75 % of the total sum squares, while the residual only represented 4 %. Thus, the AMMI model effectively explains genotype performance. In this study, the most stable sorghum hybrids were 'RB-119x435', 'Magnum', 'RB-106x25CEA', 'RB-118x430REA', 'RB-119x430CEA', 'Asgrow Coral' and 'WAC-690'. No association was observed between the most productive hybrids and the best environments. Source

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