Publications

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sympatric diversification vs. immigration: deciphering host-plant specialization in a polyphagous insect, the stolbur phytoplasma vector hyalesthes obsoletus (cixiidae).the epidemiology of vector transmitted plant diseases is highly influenced by dispersal and the host-plant range of the vector. widening the vector's host range may increase transmission potential, whereas specialization may induce specific disease cycles. the process leading to a vector's host shift and its epidemiological outcome is therefore embedded in the frameworks of sympatric evolution vs. immigration of preadapted populations. in this study, we analyse whether a host shift of the stolbu ...201323452165
natural phytoplasma infection of four phloem-feeding auchenorrhyncha across vineyard agroecosystems in central-eastern italy.the seasonal variations of grapevine yellow phytoplasma were investigated in four phloem-feeding planthopper and leafhopper species that are vectors of plant disease agents. in total, 1,148 wild specimens were collected from three vineyard agroecosystems in the marche region (central-eastern italy), from may to september 2008, and analyzed using polymerase chain reaction-restriction fragment-length polymorphism methods. of 525 euscelis lineolatus brullé, 25.1% were positive for aster yellow phyt ...201323786045
survival relative to new and ancestral host plants, phytoplasma infection, and genetic constitution in host races of a polyphagous insect disease vector.dissemination of vectorborne diseases depends strongly on the vector's host range and the pathogen's reservoir range. because vectors interact with pathogens, the direction and strength of a vector's host shift is vital for understanding epidemiology and is embedded in the framework of ecological specialization. this study investigates survival in host-race evolution of a polyphagous insect disease vector, hyalesthes obsoletus, whether survival is related to the direction of the host shift (from ...201425247065
source of hyalesthes obsoletus signoret planthopper (hemiptera: cixiidae) in southern france and potential effects of landscape.cixiid planthoppers are considered of major economic importance, as they can transmit phytoplasmas responsible for many plant diseases. while thorougly studied in vineyards, the epidemiology of stolbur phytoplasma, transmitted by hyalesthes obsoletus signoret, was rarely investigated on minor crops as lavender, where it leads to 'yellow decline' disease and large economic losses. the objective of this paper is to understand the effect of the local landscape characteristics on the presence and de ...201728891460
vitex agnus-castus is a preferred host plant for hyalesthes obsoletus.hyalesthes obsoletus signoret (homoptera: cixiidae) is a polyphagous planthopper that transmits stolbur phytoplasma (a causative agent of "yellows" disease) to various weeds, members of the solanaceae, and wine grapes (vitis vinifera l.) in europe and the middle east. planthoppers were collected by hand vacuuming eight native plant species. vitex agnus-castus l., a shrub in the verbenaceae, hosted the largest number of h. obsoletus, although olea europaea l. also served as a host for adults. usi ...200516124232
genetic variability of stolbur phytoplasma in hyalesthes obsoletus (hemiptera: cixiidae) and its main host plants in vineyard agroecosystems.bois noir is an economically important grapevine yellows that is induced by 'candidatus phytoplasma solani' and principally vectored by the planthopper hyalesthes obsoletus signoret (hemiptera: cixiidae). this study explores the 'ca. p. solani' genetic variability associated to the nettle-h. obsoletus and bindweed-h. obsoletus systems in vineyard agroecosystems of the central-eastern italy. molecular characterization of 'ca. p. solani' isolates was carried out using polymerase chain reaction/res ...201526470289
bacterial endosymbiont localization in hyalesthes obsoletus, the insect vector of bois noir in vitis vinifera.one emerging disease of grapevine in europe is bois noir (bn), a phytoplasmosis caused by "candidatus phytoplasma solani" and spread in vineyards by the planthopper hyalesthes obsoletus (hemiptera: cixiidae). here we present the first full characterization of the bacterial community of this important disease vector collected from bn-contaminated areas in piedmont, italy. length heterogeneity pcr and denaturing gradient gel electrophoresis analysis targeting the 16s rrna gene revealed the presenc ...201021183640
the sensory structures of the antennal flagellum in hyalesthes obsoletus (hemiptera: fulgoromorpha: cixiidae): a functional reduction?despite their relevance as harmful pests on plants of economic importance, hemiptera fulgoromorpha have been poorly studied as regards their antennal sensory structures. in particular, the flagellum has been neglected and, therefore, to date there are no data on its structural organization and sensory equipment. in order to fill this gap, we carried out a study on the sensillum types and distribution on the flagellum of the planthopper hyalesthes obsoletus signoret, an efficient vector of the st ...200919682602
characterization of bois noir isolates by restriction fragment length polymorphism of a stolbur-specific putative membrane protein gene.bois noir phytoplasma (bnp), widespread in wine-producing areas of europe and endemic in france and italy, is classified in the 16srxii-a subgroup, whose members are referred to as stolbur phytoplasmas. the 16s rdna gene of stolbur phytoplasma shows low variability, and few non-ribosomal genes are available as markers to assess variation among isolates. we used the stolbur-specific stol-1h10 gene, encoding a putative membrane-exposed protein, to investigate genetic diversity of french and italia ...200919453230
impact of vector dispersal and host-plant fidelity on the dissemination of an emerging plant pathogen.dissemination of vector-transmitted pathogens depend on the survival and dispersal of the vector and the vector's ability to transmit the pathogen, while the host range of vector and pathogen determine the breath of transmission possibilities. in this study, we address how the interaction between dispersal and plant fidelities of a pathogen (stolbur phytoplasma tuf-a) and its vector (hyalesthes obsoletus: cixiidae) affect the emergence of the pathogen. using genetic markers, we analysed the geog ...201223284774
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