Study on the reaction of Helianthus debilis accessions to Phomopsis helianthi Munt.-Cvet.
Mariya Petrova • Valentina Encheva • Daniela Valkova
Dobrudzha Agricultural Institute – General Toshevo, 9521, General Toshevo, Bulgaria
Резюме
Stem canker (Phomopsis helianthi Munt.-Cvet et.al) is a key disease of sunflower and it is widespread in Europe, Russia, Asia, Australia, North and Latin America. In Bulgaria, the pathogen causes significant damage to sunflower production, and its control is extremely difficult. One of the ways to reduce the impact of the disease is the use of resistant hybrids. The most effective source of Phomopsis resistance is the use of wild species diversity within a genus Helianthus. Twelve specimens of the species Helianthus debilis were examined for their response to the Phomopsis pathogen. The 4-level scale of Kiryakov and Entcheva was used. Among the tested wild annual species of genus Helianthus, accessions E-011, E-012, E-137, E-089, E-138, E-139, E-014, E-141 exhibited very resistant type of reaction. Accessions E-136, E-013 and Е-010 demonstrated resistant reaction to the pathogen. One accession (Е-082) responded with moderately resistant reaction.
Keywords: Phomopsis, Resistance, Wild Sunflower Species
