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Broomrape presents serious problems to sunflower production in Bulgaria. This leads to considerable losses expressed, on the one hand, in yield decrease, and on the other in lower quality of the obtained produce. Furthermore, the parasite forms new, more virulent races which overcome the resistance of the varieties and hybrids commonly used in production. With a view of limiting the parasite’s distribution and decreasing the losses it causes, it would be preferable to know the distribution area of the individual races, and the rate and percent of broomrape attack. The results from this investigation showed that at the present moment there are three races of the parasite in Bulgaria - races D, E and F. Race E had the widest area of distribution among them. It was widespread in all sunflower production regions of the country. Three  Orobanche  sources, Morava, Tsarevets and Byala-2, overcame the resistance of the line P-1380 ( Or-5 ),  i.e. , this is a new race for Bulgaria - race F (Bulgaria). It was registered during the growing seasons of 2003 and 2004 and it had limited distribution in individual fields of central-northern Bulgaria. An insignificant portion in the  Orobanche  population belonged to race D which was isolated from two samples only.

helia

BROOMRAPE (Orobanche cumana Wallr.) IN BULGARIA - DISTRIBUTION AND RACE COMPOSITION / EL JOPO DE GIRASOL (Orobanche cumana Wallr.) EN BULGARIA – EXTENSIÓN Y CONTENIDO RACIAL / L’OROBANCHE (Orobanche cumana Wallr.) EN BULGARIE – DISTRIBUTION DU PARASITE