I semiochimici utilizzati nella localizzazione dell’ospite da parte del parassitoide oofago Ooencyrtus telenomicida

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Abstract

[automatically translated] Ooencyrtus telenomicida (Vassiliev) (Hymenoptera: encyrtidae) is an egg parasitoid of Nezara viridula (L.) (Heteroptera: Pentatomidae) of Palearctic origin frequently spread in Sicily. The aim of this study was to investigate the localization process in the host system tritrofico Solanum lycopersicum L. - N. viridula - O. telenomicida. In particular, experiments were conducted in a Y-olfactometer, to assess the attractive role of the volatile compounds emitted both by plants, both by the adults of green bug, and in open arena, for biosaggiare. the response of the females of the parasitoid to the traces left on the substrate by adults of N. viridula. The olfactometer tests have shown that the females of O. telenomicida are attracted to semiochemicals emitted by virgin males and females from pre-ovideponenti of the pest, but not by volatile organic compounds emitted by plants not attacked, neither by sinomoni produced by plants as a result of nutrition activities and oviposition of the pest. Finally, in bioassays in arena open the females of the parasitoid showed no search behavior motivated induced kairomones of deposed contact by adults of N. viridula in motion. In light of these results it can be assumed that the aggregation pheromone emitted by N. viridula males may be the main semiochimico used by the females of O. telenomicida for the location of host eggs, as already shown in other species of the genus Ooencyrtus such OR. nezare Ishii who was found attracted to the pheromone of Riptortus clavatus aggregation (Thunberg) and O. pityocampae (Mercet) which is attracted by the sex pheromone of Traumatocampa pityocampa (Denis & Schiffermüller) .The guest localization strategy by O. telenomicida is finally discussed by comparing it to dell'imenottero scelionid wasp Trissolcus basalis (Wollaston), another parasitoid of the green bug that, in the field, was found coexisting with O. telenomicida the host egg masses. Further studies are underway to study the interactions istaurano between individuals of the two species when they compete for the same ovatura (Intra guild interaction). pityocampae (Mercet) which is attracted by the sex pheromone of Traumatocampa pityocampa (Denis & Schiffermüller) .The guest localization strategy by O. telenomicida is finally discussed by comparing it to dell'imenottero scelionid wasp Trissolcus basalis (Wollaston) another parasitoid of the green bug that, in the field, was found coexisting with O. telenomicida the host egg masses. Further studies are underway to study the interactions istaurano between individuals of the two species when they compete for the same ovatura (Intra guild interaction). pityocampae (Mercet) which is attracted by the sex pheromone of Traumatocampa pityocampa (Denis & Schiffermüller) .The guest localization strategy by O. telenomicida is finally discussed by comparing it to dell'imenottero scelionid wasp Trissolcus basalis (Wollaston) another parasitoid of the green bug that, in the field, was found coexisting with O. telenomicida the host egg masses. Further studies are underway to study the interactions istaurano between individuals of the two species when they compete for the same ovatura (Intra guild interaction). Another parasitoid of the green bug that, in the field, was found coexisting with O. telenomicida the host egg masses. Further studies are underway to study the interactions istaurano between individuals of the two species when they compete for the same ovatura (Intra guild interaction). Another parasitoid of the green bug that, in the field,
Original languageItalian
Pages168-168
Number of pages1
Publication statusPublished - 2009

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