Abstract
The Wheat dwarf virus(WDV, genus Mastrevirus), transmitted by leafhoppers of the Psammotettix genus on a persistent mode, is one of the most severe virus disease on cereals. This virus has a wide range of host plants including Poaceae. The distribution of WDV in France is based on samplings of plant material and leafhoppers throuthough years 2007-2010. Analysing these datas, coming from a multi-site and multi-year design, enables us to test the impact of presence of virus-infected Psammotettix on the sanitary state of cereals crops. However, the knowledge about the association leafhopper/WDV does still not allow identifying the role of each Psammotettix species in the epidemiology of the disease. Out of specimens collected on the crops and transferred into the laboratory on WDV-sensitive young plant of wheat, the ability of acquiring and transmitting WDV of individual leafhopper has been measured. Together with the identification to species level of these individuals, these studies should enable us to characterize risky situations for sensitive crops.