Parassitizzazione di Bactrocera oleae su olivo coltivato e selvatico in Sicilia e nel Western Cape (Sud Africa)

Research output: Contribution to conferenceOtherpeer-review

Abstract

[automatically translated] In 2009 and 2010 in Sicily and in the region of the Western Cape (South Africa) studies have been conducted on the parasitism of the olive fruit fly, Bactrocera oleae, reaping the benefits of the cultivated olive trees (Olea europaea ssp. Europaea) and Wild (O . europaea subsp. oleaster in Sicily, O. europaea ssp. cuspidata in South Africa); the plants of the two subspecies were not treated, and just a few meters. Samples were collected over four months in Sicily and two months in South Africa. For samples of olives were recorded attacks of B. oleae (bites oviposition and exit wounds) and the equatorial diameter. The olives attacked by B. oleae in Sicily were 69% and 50% in olive grown nell'olivastro. In the Western Cape from wild is also Bactrocera biguttula sfarfallata (8% of total Bactrocera spp.); tefritidi of the attack was found on 27% of the cultivated olives and 17% of the fruits of the wild. In Sicily, the most abundant parasitoid of both the cultivated olive tree which is wild olive on the result braconide Psyttalia concolor followed dall'eulofide pnigalio mediterraneus; for the first time in Sicily it was found the eulofide gregarious Baryscapus silvestrii. In the Western Cape by O. europaea ssp olives. cuspidata are sfarfallati three hoverflies: Utetes africanus, Psyttalia lounsburyi, and some specimens of Bracon celer; from the olive are grown only sfarfallati the last two hoverflies. Although the two regions are found different species of parasitoids and two different subspecies of wild olive, both with small drupes (7-8 mm) in diameter, the parasitism of B. oleae due to hoverflies is much greater on the olive drupes wild ( 43% in Sicily, 24% in South Africa), compared to that grown on the olive (8% in Sicily, 4% in South Africa). E 'was found a clear negative correlation between the diameter of the drupe and the level of parasitization. The hoverflies parasitoids that in different areas of the world are more specialized in parasitism of B. oleae, evolved on small drupes of the wild olive, have an ovipositor of less than about 2,
Original languageItalian
Pages338-338
Number of pages1
Publication statusPublished - 2011

Cite this