| Popis: |
Spanish sunflower acreage is basically divided into three main and isolated areas, the Guadalquivir valley, southern Spain, represents 37% of the total acreage, the Cuenca area located in Spain's central plateau, 28%, and the Castilla-Leon area, northern Spain, 29%. Sunflower broomrape (Orobanche cumana Wallr.) has been present in Spain since the 1960's. From that time on, different waves of dissemination and dispersion of the parasite have been registered. The latest correspond to the broomrape race E dispersal in the early 1990's and race F dispersal in the first few years of this century. These broomrape dissemination waves have been limited only to the Guadalquivir and Cuenca areas. In the Castilla-Leon area, the presence of broomrape had not been noticed until now. In 2008, a highly virulent broomrape infection focal point (about 300 m2) was detected in a sunflower plot near Medina del Campo (Valladolid), south of the center of the Castilla-Leon area. Racial determination has proved that this broomrape inoculum belongs to race F. |
