Méthode de raisonnement pour la prévention et la gestion de la résistance aux herbicides

National audienc

Aphid abundance on cereals in autumn predicts yield losses caused by barley yellow dwarf virus

International audienc

Mise en évidence des graminées adventices résistantes aux antigraminées dans les céréales

National audienc

Resultat d'une enquete floristique realisee dans les parcelles temoins des essais desherbage

National audienc

Effects of climate and land use on the occurrence of viruliferous aphids and the epidemiology of barley yellow dwarf disease

International audienceBarley yellow dwarf (BYD) disease is one of the most severe viral diseases in autumn sown cereals. In Western Europe, crop losses are mainly due to the PAV species of BYD viruses transmitted by Rhopalosiphum padi, the most abundant aphid in autumn. The proportion of migrant winged aphids that carry viruses in autumn is considered a major epidemiological factor for determining the disease incidence. In the main French cereal areas, during a 6-week period in autumn 1999-2002, the proportion of viruliferous R. padi assessed using a TAS-ELISA technique was on average of 4.98% (range 2.01-9.91%). Variations according to trap location were correlated with land use at the regional scale, annual variations being correlated with the climate of the year. Implementations of these results to improve BYD disease management program are discussed