Search results for " phytoplasma"

Epidemiological investigations and molecular characterization of ‘candidatus phytoplasma solani’ in grapevines, weeds, vectors and putative vectors i…

2020

Bois noir is caused by &lsquo

Grapevine infectious diseases in Sicily

2008

INVESTIGATIONS ON ‘CANDIDATUS PHYTOPLASMA SOLANI’ IN WESTERN SICILY, SOUTHERN ITALY

2016

‘Candidatus Phytoplasma solani’, belonging to the 16SrXII-A subgroup, is associated with grapevine Bois Noir (BN). It is usually transmitted by Hyalesthes obsoletus from a wide range of weeds to grapevine, which is considered a dead-end host. Moreover, other alternative vectors can play a role in the epidemiology of the disease. In Sicily, the presence of BN was reported in 1996, both on typical and on newly introduced cultivars. Furthermore, high BN incidence was observed on native grape cultivars grown close to ‘Chardonnay’ vineyards. In summer 2014 and 2015, the spread and the severity of BN were recorded in a 10 year-old vineyard located in San Giuseppe Jato (PA, Western Sicily), grown …

Virescence of tenweeks stock associated to phytoplasma infection in Sicily

2007

In April 2007, a severe disease occurred in Sicily (Italy) in a glasshouse cultivation of tenweeks stock belonging to the cultivar White-Beach. Plants were stunted and rosetted, and the flowers were of small size and characterized by virescence symptoms. Phytoplasma presence and identity was detected by applying PCR/RFLP techniques and sequencing of 16S ribosomal gene. Phytoplasmas were identified as belonging to ribosomal subgroup 16SrII-A, never reported before in Italy and showed 99% of homology with ‘Candidatus Phytoplasma aurantifolia’ and related phytoplasmas. This is the first report of a phytoplasma disease of tenweeks stock. Considering that this Brassicaceae ornamental species is …

The syndrome "basses richesses" of sugar beet in France is associated with different pathogen types and insect vectors

2007

International audience; The syndrome “basses richesses” (SBR) of sugar beet in France is associated with two phloem-restricted uncultivable bacteria: a stolbur phytoplasma and a y-3 proteobacteria. The known vector of proteobacteria is a cixiid planthopper, Pentastiridius leporinus (Hemiptera Cixiidae), formerly shown to transmit both the prokaryotes. The role of P. leporinus and of two other planthopper species, Cixius wagneri and Hyalesthes obsoletus, in spreading the two pathogens to sugar beet were compared and quantified. Because of its abundance and high infection rates with proteobacterium, P. leporinus was confirmed to be the economic vector of SBR disease. P. leporinus and C. wagne…

Data from: Sympatric diversification vs. immigration: deciphering host-plant specialization in a polyphagous insect, the stolbur phytoplasma vector H…

2013

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 stolbur phytoplasma vector, Hyalesthes obsoletus from field bindweed to stinging nettle in its northern distribution range evolved sympatrically or by immigration. The exploitation of stinging nettle has l…