In the lines RHA 420 and RHA 443, which are characterized by resistance to most aggressive races of mildew - 700, 730, 770, have been found alleles that are markers of the gene PlARG, who currently determines universal resistance to all known races of the pathogen. A sources of resistance to new virulent races of broomrape were found among wild species of Helianthus and cultivated sunflower populations derived from distant hybrids with Jerusalem artichoke (Helianthus tuberosus). Genetic control of resistance depends on the race of broomrape and resistance sources. Among the samples Sample 24 Sample 25 Sample 27 Sample 28 Sample 29 Sample 30 Sample 31, there are identified ones which at the presence of the marker allele can be considered carriers of the dominant gene for resistance to broomrape Or6. Or resistance genes are localized as a cluster in the third linkage group of sunflower genetic card.