Many volatile compounds not only play the role of “chemical messengers” in the relations between plant and phytophagous insect, but also become part of the wider context of tritrophic plant-phytophagous-enthomophage interactions. The volatile terpene substances in pine needles may similarly fulfil a twofold role, by influencing the behaviour of the pine processionary moth, as recently demonstrated, while at the same time acting on its egg parasitoids. In the past, it was already noticed that the egg parasitoids of the pine processionary moth show a different ability to localize host eggs in mixed pine forests depending on the pine species on which the eggs were laid. Accordingly, laboratory tests were conducted to assess the possible influence of the most common and abundant volatile terpenes found in pine needles on the antagonists of the lepidopteran. Using an olfactometer, the response of females of the two main egg parasitoids of the pine processionary moth, Ooencyrtus pityocampae (Mercet) and Baryscapus servadeii (Domenichini), was analysed at different dosages of  and -pinene, (R)-(+) and (S)-(-) limonene and racemic limonene. Results clearly showed that these volatile compounds exert a degree of attraction on the two egg parasitoids; it can thus be hypothesized that such compounds play a significant role in pine processionary moth egg location and consequently in the parasitization process. The best results were obtained with -pinene, racemic limonene and (R)-(+)-limonene.

Influence of monoterpenes of pine needles on the behaviour of Baryscapus servadeii and Ooencyrtus pityocampae, two egg parasitoids of Pine processionary moth / R.Tiberi ; T.Panzavolta ; A.Niccoli. - STAMPA. - Egg parasitoids for biocontrol of insect pests:(2002), pp. 49-50. (Intervento presentato al convegno Egg parasitoids for biocontrol of insect pests. 6th Intenational Symposium tenutosi a Perugia nel 15-18/9/2002).

Influence of monoterpenes of pine needles on the behaviour of Baryscapus servadeii and Ooencyrtus pityocampae, two egg parasitoids of Pine processionary moth.

TIBERI, RIZIERO;PANZAVOLTA, TIZIANA;
2002

Abstract

Many volatile compounds not only play the role of “chemical messengers” in the relations between plant and phytophagous insect, but also become part of the wider context of tritrophic plant-phytophagous-enthomophage interactions. The volatile terpene substances in pine needles may similarly fulfil a twofold role, by influencing the behaviour of the pine processionary moth, as recently demonstrated, while at the same time acting on its egg parasitoids. In the past, it was already noticed that the egg parasitoids of the pine processionary moth show a different ability to localize host eggs in mixed pine forests depending on the pine species on which the eggs were laid. Accordingly, laboratory tests were conducted to assess the possible influence of the most common and abundant volatile terpenes found in pine needles on the antagonists of the lepidopteran. Using an olfactometer, the response of females of the two main egg parasitoids of the pine processionary moth, Ooencyrtus pityocampae (Mercet) and Baryscapus servadeii (Domenichini), was analysed at different dosages of  and -pinene, (R)-(+) and (S)-(-) limonene and racemic limonene. Results clearly showed that these volatile compounds exert a degree of attraction on the two egg parasitoids; it can thus be hypothesized that such compounds play a significant role in pine processionary moth egg location and consequently in the parasitization process. The best results were obtained with -pinene, racemic limonene and (R)-(+)-limonene.
2002
Egg parasitoids for biocontrol of insect pests. 6th international symposium. Symposium schedule, abstracts,list of partecipants
Egg parasitoids for biocontrol of insect pests. 6th Intenational Symposium
Perugia
R.Tiberi ; T.Panzavolta ; A.Niccoli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/326485
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