Seed, soil and vegetative transmission contribute to the spread of pecluviruses in Western Africa and the Indian sub-continent.

Dieryck, Benjamin [UCL] Otto, G Doucet, Diane [UCL] Legrève, Anne [UCL] Delfosse, Philippe [Icrisat (Niger)] Bragard, Claude [UCL]

Peanut clump and sugarcane red leaf mottle diseases are caused by viruses of the genus Pecluvirus. Indian peanut clump virus occurs in the Indian sub-continent and Peanut clump virus in West Africa. A feature of these viruses is that they are both seed and soil transmitted. Both modes of transmission contribute to long-term persistence and field spread. Data on seed transmission in pearl millet, virus movement within the plant and virus diversity based on RNA-1 partial sequences are presented. This study emphasizes that pecluviruses are also viruses of cereals infecting sorghum and pearl millet, and highlights a correlation between the countries cultivating these two crops and the virus distribution. Ways of controlling pecluviruses and their vector, Polymyxa graminis, taking into account the virus dissemination routes, are proposed.