Résultat de la recherche
8 recherche sur le mot-clé
'Sitobion fragariae' 


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C. Ramirez ; P. Caballero ; H. Niemeyer | 1999We hypothesized that aphids after previous exposure to hydroxamic acids (Hx), a family of secondary plant compounds deleterious to aphids, are able to reduce their subsequent exposure to them. This hypothesis was tested by evaluating the time to[...]![]()
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C. Ramirez ; N. Olea ; H. Niemeyer | 1999The pattern of cell punctures in the electrical penetration graph was studied from the start of a probe leading to the first phloem phase by the aphid Sitobion fragarine (Walker) (Sternorrhyncha: Aphididae) on two cultivars of the wheat, Triticu[...]![]()
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C. Ramirez ; H. Niemeyer | 1999Extended sieve element salivation (E1 waveform in the electrical penetration graph) is a characteristic activity during early sieve element punctures, particularly in resistant plants. In order to explore a chemically-mediated mechanism of resis[...]![]()
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P. Sunnucks ; D. Chisholm ; E. Turak ; D. Hales | 1998The aim of this study was to test whether host plant responses of Sitobion aphids have evolved under parthenogenesis and to examine the relationship between genetic and phenotypical similarity. There are four known chromosomal races of Australia[...]![]()
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C. Figueroa ; J. Simon ; J. Legallic ; H. Niemeyer | 1999A set of molecular markers to differentiate the aphid (Hemiptera: Aphidoidea) species Sitobion avenae (Fabricius) from Sitobion fragariae (Walker), is presented. These markers correspond to (1) a region of the mitochondrial DNA, (2) five species[...]![]()
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We describe a simple method, using allozyme electrophoresis,that enables the identification of individual aphids, and demonstrate its application to the Sitobion miscanthi (Takahashi)-Sitobion nr fragariae complex of species and chromosomal races.![]()
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Insect herbivores that have high impacts on their host plants reduce the longevity of their habitats and require dispersal mechanisms. This hypothesis was tested by comparing the life history traits, particularly short- and long-distance dispers[...]![]()
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C. Ramirez ; H. Niemeyer | 2000It was hypothesized that (I) previous experience of aphids on a host plant leads to differences in their feeding behavior relative to aphids without previous experience on it and that (2) a change in the physiological state of the aphid modifies[...]