DEMANGEAT , Gerard

National audience

The ectoparasitic dagger nematode, Xiphinema index, transmits Grapevine fanleaf virus (GFLV), which is responsible for a progressive degeneration of grapevines occurring across the world's vineyards. Since 2000, new data on the biology and ecology of the vector nematode and on the virus-nematode and plant-nematode interactions have contributed...

International audience

National audience

Aim : Grapevine plants from the Bordeaux wine region (France) showing symptoms of fanleaf degeneration, but negative for the two main fanleaf viruses were screened by ELISA for other nepoviruses that could explain the symptoms. Methods and results : ELISA tests were performed over a 3-year period (2009-2011) on leaves and woody canes. A total...

The ectoparasitic dagger nematode Xiphinema index specifically transmits Grapevine fanleaf virus (GFLV) which is responsible for a progressive degeneration of grapevines occurring in most vineyards worldwide. Because of the ban on nematicides and of the economically unacceptable interval (>7 years) required for nematode eradication between two...

The dagger nematode Xiphinema index has a high economic impact in vineyards by direct pathogenicity and above all by transmitting the Grapevine fanleaf virus (GFLV). Agrochemicals have been largely employed to restrict the spread of GFLV by reducing X. index populations but are now banned. As an alternative to nematicides, the use of fallow...

Fanleaf disease is the most serious grapevine viral disease worldwide. The main pathogens responsible for this disease are the Grapevine fanleaf virus (GFLV) and Arabis mosaic virus (ArMV). Both nepoviruses are naturally and specifically transmitted from vine to vine by two distinct species of ectoparasitic nematodes, X index for GFLV and X....

Grapevine fanleaf virus (GFLV) is transmitted specifically from grapevine to grapevine by the ectoparasitic root-feeding nematode Xiphinema index. Limited information is available on the survival of X. index in vineyard soil and on the retention of GFLV by X. index over extended periods of time. We addressed these two issues by quantifying the...

National audience

Xiphinema index is an important plant parasitic nematode that induces direct damages and specifically transmits the Grapevine fanleaf virus, which is particularly harmful for grapevines. Genomic resources of this nematode species are still limited and no functional gene validation technology is available. RNA interference (RNAi) is a powerful...

International audience

National audience