Published in Scientific Papers. Series A. Agonomy., Vol. LVI
Written by Elena Andreea TEODORESCU, Nicolae BOAGHE, Georgeta DICU, Mihaela POPA
One of the most important disease of sunflower crop is downy mildew, wich is caused by Plasmopara halstedii fungus(Farl.) Berl. et de Toni (syn. Plasmopara helianthi Novit). Downy mildew is a common disease in many areas of theworld where sunflower is grown and infects young plants in spring when soil moisture is high and temperatures rangefrom 15 to 18oC. Loss of young plant caused by pathogen may be up to 80%. The pathogen could be controlled growingresistant genotypes and that is why the major objective of this study was to develop sunflower hybrids geneticallyresistant to dominant races of downy mildew in Fundulea area. To prevent losses caused by downy mildew, we startcreate hybrids genetically resistant to this pathogen, parental lines were backcrossed to introduce new genes usingresistant sources from maintainer line HA 335 and restorer line RHA 274. We test resistance for our genotypesartificial infested in collaboration with Institute of Field and Vegetable Crops Novi Sad. In the future we proposed totest our hybrids in Romania using the international set of differentials for Plasmopara halstedii pathogen races. Isabsolutely necessary to create resistant varieties for the newest Romanian races, considering downy mildew is one ofthe most important disease for sunflower crop.
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