Norma Elena Leyva-López

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In recent years, the potato crop in Mexico has been notably affected by diseases recognized as potato purple top (PPT) in foliage and potato hair sprouts (PHS) in germinating tubers. In both cases, these syndromes reduce production by affecting viability of the tubers used as seeds. There is evidence indicating that phytoplasmas are associated with these(More)
Bouteloua gracilis (blue grama grass) native populations have been shown to be highly variable, however the genetic basis of this variability has not been well established. Determining the extent of genetic variability within and among plant populations have important repercussions for the management and conservation of species, and in particular for those(More)
Pseudomonas syringae pv. tomato has been observed in the fields in Sinaloa causing typical symptoms of bacterial speck. During the 2004–2005 growing seasons atypical symptoms were observed in tomato varieties grown in Sinaloa, consisting of external necrosis of stems, petioles, peduncles and fruit calyxes. Although the disease affected 80–90% of the(More)
The pathogenicity of 10 bacterial isolates was investigated on potato, radish, carrot and beet, including sensitivity and pathogen control efficacy. The isolates were identified by morphological, biochemical and molecular methods. All isolates were pathogenic on radish, carrot, and beet, and were highly virulent on potato. Although the isolates were(More)
This study investigated whether white spot syndrome virus and Infectious hypodermal and hematopoietic necrosis virus, can survive in wild invertebrates and vertebrates in the environment surrounding shrimp farms along the Pacific coast of Mexico. The evidences imply that both viruses have a potential of persisting in crabs, blue, white and brown shrimps.(More)
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