Recent investigations conducted on several tritrophic systems have demonstrated that egg parasitoids, when searching for host eggs, may exploit plant synomones that have been induced as a consequence of host oviposition. In this article we show that, in a system characterized by host eggs embedded in the plant tissue, naı¨ve females of the egg parasitoid Anagrus breviphragma Soyka (Hymenoptera: Mymaridae) responded in a Y-tube olfactometer to volatiles from leaves of Carex riparia Curtis (Cyperaceae) containing eggs of one of its hosts, Cicadella viridis (L.) (Hemiptera: Cicadellidae). The wasp did not respond to host eggs or to clean leaves from non-infested plants compared with clean air, whereas it showed a strong preference for the olfactometer armcontaining volatiles of leaves with embedded host eggs, compared with the arm containing volatiles of leaves from a non-infested plant or host eggs extracted from the plant.When the eggs were removed from an infested leaf, the parasitoid preference was observed only if eggs were added aside, suggesting a synergistic effect of a local plant synomone and an egg kairomone. The parasitoid also responded to clean leaves from an egginfested plant when compared with leaves from a non-infested plant, indicating a systemic effect of volatile induction.

Role of volatile semiochemicals in host location by the egg parasitoid Anagrus breviphragma

BERZOLLA, ALESSIA;
2012

Abstract

Recent investigations conducted on several tritrophic systems have demonstrated that egg parasitoids, when searching for host eggs, may exploit plant synomones that have been induced as a consequence of host oviposition. In this article we show that, in a system characterized by host eggs embedded in the plant tissue, naı¨ve females of the egg parasitoid Anagrus breviphragma Soyka (Hymenoptera: Mymaridae) responded in a Y-tube olfactometer to volatiles from leaves of Carex riparia Curtis (Cyperaceae) containing eggs of one of its hosts, Cicadella viridis (L.) (Hemiptera: Cicadellidae). The wasp did not respond to host eggs or to clean leaves from non-infested plants compared with clean air, whereas it showed a strong preference for the olfactometer armcontaining volatiles of leaves with embedded host eggs, compared with the arm containing volatiles of leaves from a non-infested plant or host eggs extracted from the plant.When the eggs were removed from an infested leaf, the parasitoid preference was observed only if eggs were added aside, suggesting a synergistic effect of a local plant synomone and an egg kairomone. The parasitoid also responded to clean leaves from an egginfested plant when compared with leaves from a non-infested plant, indicating a systemic effect of volatile induction.
2012
Elisabetta Chiappini; Gianandrea Salerno; Alessia Berzolla; Alessia Iacovone; Maria Cristina Reguzzi; Eric Conti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/414376
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