Eur. J. Entomol. 103 (1): 263-265, 2006 | DOI: 10.14411/eje.2006.032

Increased xylem ingestion and decreased phloem ingestion in the aphid Acyrthosiphon pisum (Hemiptera: Aphididae) parasitised by Aphidius ervi (Hymenoptera: Braconidae)

Claudio C. RAMÍREZ1, Cristian A. VILLAGRA2, Hermann M. NIEMEYER2
1 Instituto de Biología Vegetal y Biotecnología, Universidad de Talca, Casilla 747, Talca, Chile; e-mail: clramirez@utalca.cl
2 Laboratorio de Química Ecológica, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile

The effects of parasitisation by Aphidius ervi on the feeding behaviour of the aphid Acyrthosiphon pisum were studied. There was progressive increase in the time devoted to xylem ingestion (G waveform) and concomitant decrease in time devoted to phloem ingestion (E2 waveform) in parasitized relative to unparasitized aphids, as the time from parasitisation increased. These changes are interpreted as a way aphids compensate for metabolic changes occurring during parasitisation.

Keywords: Acyrthosiphon pisum, Aphidius ervi, parasitisation, feeding behaviour, xylem, phloem, ingestion

Revised: July 27, 2005; Accepted: July 27, 2005; Published: January 30, 2006  Show citation

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RAMÍREZ, C.C., VILLAGRA, C.A., & NIEMEYER, H.M. (2006). Increased xylem ingestion and decreased phloem ingestion in the aphid Acyrthosiphon pisum (Hemiptera: Aphididae) parasitised by Aphidius ervi (Hymenoptera: Braconidae). EJE, 103(1), 263-265. doi: 10.14411/eje.2006.032
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