An investigation was carried out on the distribution and biodiversity of steinernematid and heterorhabdtid entomopathogenic nematodes (EPN) in nine regions of Italy in the period 1990-2010. More than 2000 samples were collected from 580 localities and 133 of them yielded EPN specimens. A mapping of EPN distribution in Italy showed 133 indigenous EPN strains belonging to 12 species: 43 isolates of Heterorhabditis bacteriophora, 1 of H. downesi, 1 of H. megidis, 51 of Steinernema feltiae, 12 of S. affine, 4 of S. kraussei, 8 of S. apuliae, 5 of S. ichnusae, 3 of S. carpocapsae, 1 of S. vulcanicum, 3 of Steinernema 'isolate S.sp.MY7' of 'S. intermedium group' and 1 of S. arenarium. Steinernematids are more widespread than heterorhabditids and S. feltiae and H. bacteriophora are the most commonly encountered species. Sampling sites were grouped into 11 habitats: uncultivated land, orchard, field, sea coast, pinewood, broadleaf wood, grasslands, river and lake borders, caves, salt pan and moist zones; the soil texture of each site was defined and the preferences of habitat and soil texture of each species was assessed. Except for the two dominant species, S. feltiae and H. bacteriophora, EPN occurrence tends to be correlated with a specific vegetation habitat. Steinernema kraussei, H. downesi and H. megidis were collected only in Sicily and three of the species recently described - S. apuliae, S. ichnusae and S. vulcanicum - are known only from Italy and seem to be endemic.
Abstract& Key message Cork oak decline is widespread in all its distribution range and seems to be triggered mainly by both mismanagement and unfavorable climatic factors. As a result, cork oak forests become susceptible to pest attack, which accelerates the onset of decline. Pest management strategies for this valuable and highly biodiverse ecosystem are examined in this review, taking into account the main insect pests and how their impact on cork oak forests is affected by climate change. While monitoring pests may provide the tools to predict the transition from endemic to epidemic insect populations, forestry practices (sanitary felling), biological control, and trapping are some of the most promising measures in protecting cork oak forests. & Context Over the last decades, cork oak (Quercus suber L.) decline has affected millions of trees throughout its distribution range. Cork oak is a typically Mediterranean species remarkably relevant for the biodiversity and landscape conservation of vast evergreen oak forests. Cork oak is also well known and highly valued for cork production. Climatic changes, management practices, and biotic factors, particularly plant pathogens and insect pests, play a decisive role in tree death and market devaluation of cork. & Aims Here, we review the major insect pests possibly involved in cork oak decline, while discussing pest management strategies. & Methods A survey of the current literature was performed to identify major insect pests affecting cork oak trees, as well as to establish the most promising pest management strategies under climate change. & Results Many authors seem to agree that the decline is triggered by both anthropogenic and abiotic factors, such as the mismanagement of cork oak forests and unfavorable climate (high temperatures and droughts). Consequently, trees become susceptible to pests and pathogens, which accelerate the onset of decline. & Conclusion Since a further increase in temperatures and droughts is expected, developing adequate management strategies to adapt cork oak trees to climate change, while simultaneously preventing and reducing insect pest attacks, is of foremost importance in the effort to conserve these unique and highly diverse ecosystems.Keywords Quercus suber . Cork oak decline . Climate change . Forest management Handling Editor: Aurelien SALLE Contribution of the co-authors Riziero Tiberi and Tiziana Panzavolta: conceived the idea, supervised literature reviewing, wrote the manuscript, and reviewed its final version. Manuela Branco: contributed to the writing of the manuscript, the reviewing of literature, and the revision of the final draft. Matteo Bracalini: contributed to the writing of the paper, the selection of literature, and the English revision of the manuscript. Francesco Croci: contributed to the writing of the manuscript and the assembling of related literature. All authors have read and approved the final manuscript.
1 Preliminary investigations were carried out on Dryocosmus kuriphilus Yasumatsu on Castanea sativa Miller in Tuscany to assess variations in gall characteristics in coppice and high forest at two crown heights (height < 2 or 2-6 m), influence of bud size and bud position on oviposition rates and susceptibility of three cultivars. 2 Gall size may depend on various factors, including wasp population density. In the present study area, small galls (with one or two cells) were the most numerous in 2008, whereas larger galls (with more than three cells) prevailed in 2009. 3 Dryocosmus kuriphilus oviposition occurrence was influenced by both bud size and bud position. Buds with eggs tended to be larger in size compared with bud without eggs, suggesting that D. kuriphilus females prefer to lay eggs in larger buds (approximately 6 mm 3 ) compared with smaller buds (approximately 3 mm 3 ). The mean number of eggs per bud tended to decrease from the apical bud toward the basal bud. 4 Three C. sativa cultivars, Carpinese, Fusca and Cesurone, were examined. Fusca grafts had significantly more galls compared with Carpinese and Cesurone, whereas Cesurone grafts had more larvae per bud compared with Carpinese and Fusca.Overall, the Carpinese cultivar may be less susceptible to D. kuriphilus galling compared with the Fusca and Cesurone cultivars.
The egg parasitoids of Thaumetopoea pityocampa observed in Italy are five Chalcidoidea: Anastatus bifasciatus B. de Fonsc. (Eupelmidae), Ooencyrtus pityocampae (Mercet) and O. telenomicida (Vassiliev) (Encyrtidae), Eutetrastichus servadeii (Dom.) (Eulophidae) and Trichogramma embryophagum (Htg.) (Trichogrammatidae). The most widespread and effective were O. pityocampae and E. servadeii. In mountainous, submountainous and hilly environments in the peninsular O. pityocampae and E. servadeii predominated in accordance with the gradation phase of the pine processionary. In the warmer areas of central and southern Italy, E. servadeii was constantly predominant. The presence of A. bifasciatus and T. embryophagum was always limited and irregular in the different environments, O. telenomicida has only been recorded in southern Italy (Apulia). This paper also discusses the different distribution of the egg parasitoids in the various parts of the egg mass, the influence of the different Pinus species when they are present in the same forest, and the distribution of the egg parasitoids at different levels of the canopy of the pines. Zusammenfassung Eiparasitoide des Kiefernprozessionsspinners Thaumetopoea pityocampa (Den. & Schiff.) (Lep., Thaumetopoeidae) in Italien: Verteilung und Aktivität in verschiedenen Regionen Bei den in Italien beobachteten Ooparasitoiden von Thaumetopoea pityocampa handelt es sich um 5 Chalcidoidea: Anastatus bifasciatus B. de fonsc. (Eupelmidae), Ooencyrtus pityocampae (Mercet) und O. telenomicida (Vassiliev) (Encyrtidae), Eutetrastichus servadeii (Dom.) (Eulophidae) und Trichogramma embryophagum (Htg.) (Trichogrammatidae). Die am weitesten verbreiteten Arten mit den stärksten Auswirkungen auf den Wirt sind O. pityocampae und E. servadeii. In den Gebirgs‐, Mittelgebirgs‐ und Hügelregionen der Halbinsel ist ein vermehrtes Auftreten von O. pityocampae bzw. E. servadeii zu der jeweiligen Gradationsphase des Pinienprozessionsspinners zu beobachten. In den wärmeren Zonen Mittel‐ und Süditaliens herrscht E. servadeii konstant vor. A. bifasciatus und T. embryophagum ist in den verschiedenen untersuchten Regionen nur geringfügig und zeitlich unregelmäßig vertreten, während O. telenomicida bis jetzt nur in Süditalien (Apulien) nachgewiesen werden konnte. Weiterhin wird die unterschiedliche Verteilung der Oophagen in den verschiedenen Teilen des Eigeleges erörtert sowie vor allem auch der Einfluß der verschiedenen Pinus‐Arten auf die Eiparasitoide, wenn sie sich im selben Pinuswaldstück befinden. Die Verteilung der Ooparasitoiden in den verschiedenen Bereichen der Baumkronen von Pinus‐Arten wird erläutert.
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