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Topinambour is a perennial species originating from central part of North America. This species is known to be a potential source of resistance to some diseases of cultivated sunflower like stem canker. In this research we evaluated 141 populations of Helianthus tuberosus from the collection of Institute of Field and Vegetable Crops in Novi Sad. Plants in the collection field and in the experimental field were artificially inoculated using Phomopsis helianthi isolate from Rimski Šančevi. After seven days of growing on PDA (Potato-Dextrose Agar) medium, mycelial plugs were placed on leaf tip and wrapped with aluminum foil. Disease progress was measured in regular intervals. Occurrence of natural infections was also evaluated and all diseases were noted. As a result of this survey significant differences were detected among populations regarding disease intensity. Out of all assessed populations those labeled as TUB2046, TUB2062 and TUB CG 65 were most resistant

Resistance of topinambour (Helianthus tuberosus L) to sunflower stem canker in field conditions