I parassitoidi di Leptoglossus occidentalis in Sicilia e nel suo areale di origine nordamericano

Virgilio Caleca, Matteo Maltese

Research output: Contribution to conferenceOtherpeer-review

Abstract

[automatically translated] On coreide Leptoglossus occidentalis, bug of North American origin conifers, which in Italy has registered a decline in production of Pinus pinea pine nuts, have so far registered parasitoids of nymphs and adults, and parasitoids oofagi. The first group includes the Diptera Tachinidae: in the US and Canada was found Trichopoda pennipes, while in Central and Northern few adults were parasitized by Ectophasia crassipennis and Tachinidae still unidentified. Among the parasitoids oofagi in Canada had been reported so far the Platygastridae Gryon pennsylvanicum, the eupelmidae Anastatus pearsalli and encyrtidae Ooencyrtus sp .; in central and northern, albeit with minimum percentages, we have already been reported Anastatus bifasciatus, Ooencyrtus pityocampae, and eulofide Baryscapus servadeii. The purpose of this study was to identify the parasitoids in Sicily and in North America. In Sicily, after two years of surveys in the field and Exhibition sentinel egg masses, no parasitoid is sfarfallato by L. occidentalis eggs; dell'eterottero one adult was found with a tachinid egg. During the research carried out in North America in 2010, from the coreide eggs freely laid in the field G. pennsylvanicum was the only parasitoid obtained in 6 locations of British Columbia, and in 3 of California; for the latter area is the first and only known parasitoid. Instead, exposing pairs of L. occidentalis with ovideponenti females within net bags in British Columbia, on western white pine eggs were parasitized, as well as from G. pennsylvanicum (23%), also from Ooencyrtus johnsoni (4%), for the first time we reported on this guest, and from Anastatus sp. (4%); the platigastridae was the only parasitoid sfarfallato from eggs laid on Picea engelmannii (60%) and Lodgepole Pine (29%). The parasitism of Gryon in the tests with bags was greater (46%) than that of eggs laid off from the bags (4%). The increased activity of G. pennsylvanicum was recorded in July. G. pennsylvanicum appears an effective natural antagonist of L. occidentalis, which is why it was recently introduced in the laboratory in Italy, and are being oviposition tests on Italian heteroptera, in view of its future release in the open field. single parasitoid sfarfallato from eggs laid on Picea engelmannii (60%) and of Pinus contorta (29%). The parasitism of Gryon in the tests with bags was greater (46%) than that of eggs laid off from the bags (4%). The increased activity of G. pennsylvanicum was recorded in July. G. pennsylvanicum appears an effective natural antagonist of L. occidentalis, which is why it was recently introduced in the laboratory in Italy, and are being oviposition tests on Italian heteroptera, in view of its future release in the open field. single parasitoid sfarfallato from eggs laid on Picea engelmannii (60%) and of Pinus contorta (29%). The parasitism of Gryon in the tests with bags was greater (46%) than that of eggs laid off from the bags (4%). The increased activity of G. pennsylvanicum was recorded in July. G. pennsylvanicum appears an effective natural antagonist of L. occidentalis, which is why it was recently introduced in the laboratory in Italy, and are being oviposition tests on Italian heteroptera, in view of its future release in the open field. pennsylvanicum was recorded in July. G. pennsylvanicum appears an effective natural antagonist of L. occidentalis, which is why it was recently introduced in the laboratory in Italy, and are being oviposition tests on Italian heteroptera, in view of its future release in the open field. penns
Original languageItalian
Pages350-350
Number of pages1
Publication statusPublished - 2011

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