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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[...]
article/chapitre/communication
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[...]
article/chapitre/communication
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. Caballero ; C. Ramirez ; H. Niemeyer | 2001The effect of alternative host condition on the pattern of specialisation of the aphid Rhopalosiphum maidis (Fitch) was studied. R. maidis commonly occurs in Chile on Johnson grass (Sorghum halepense L.) but rarely on contiguous wheat (Triticum [...]
article/chapitre/communication
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[...]
