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2009, vol. 46, iss. 1, pp. 55-61
Downy mildew and its control
Institute of Field and Vegetable Crops, Novi Sad
Abstract
Sunflower (Helianthus annuus) is the most important oil crop in Serbia, that produces high quality oil for human consumption and technical purposes as well. Sunflower is attacked by more than 40 different diseases of which only a certain number causes serious problems in the production process. Among these, the most important are phytopathogenic fungi. One of the most damaging diseases is downy mildew which is caused by Plasmopara halstedii fungus (Farl.) Berl.et Toni. (syn. Plasmopara helianthi Novit.). In conditions that favour its development it can reduce the yield of the sunflower by 50%. Many physiological races of this fungi hinder the control of the disease and that's why agrotechnical, chemical and quarantine measures should be applied. As the dominant race in our country is race 730, the testing of the selected material is aimed at creating hybrids of high resistance to this particular race of downy mildew. Other races are also taken into consideration and evaluated. As downy mildew occurred during the vegetation period in 2008, this research was designed to investigate the efficiency of fungicides, applied in case of secondary infection. We have measured oil and protein contents, germination and pathogen presence in seed of treated plants. Crops infested with Plasmopara helianthi and treated with Ridomil, developed healthy seed with unchanged oil and protein contents in comparison with non-treated healthy crop. According to given results, we can confirm that, when secondary infection of downy mildew appears, treatment with fungicides are reliable. Following NS hybrids in Serbian commercial sunflower production that contain Pl-6 gene, conferring resistance to most important races of downy mildew are recommended: Sremac, Duško, Plamen, Kazanova,Velja and Rimi PR.
References
Aćimović, M. (1998) Bolesti suncokreta. Novi Sad: Naučni institut za ratarstvo i povrtarstvo
Lačok, N. (2008) Osnovne bolesti suncokreta njihova štetnost i mere borbe. in: Zbornik radova sa savetovanja o proizvodnji ratarskih kultura, Jalta, Ukrajina, rad je u štampi
Lačok, N. (2008) Zdrav suncokret - garancija za dobijanje ulja visokog kvaliteta. in: Savetovanje industrije ulja (XLIX), Herceg Novi, Zbornik radova, Novi Sad: Tehnološki fakultet, str. 45-51
Maširević, S., Jasnić, S. (2006) Plamenjača suncokreta (Plasmopara halstedii). Biljni lekar, vol. 34, br. 4-5, str. 315-319
Panković, D., Jocić, S., Lačok, N., Sakač, Z., Škorić, D. (2004) The use of PCR-based markers in the evaluation of resistance to downy mildew in ns-breeding material. Helia, vol. 27, br. 40, str. 149-158
Panković, D., Radovanović, N., Jocić, S., Satović, Z., Škorić, D. (2007) Development of co-dominant amplified polymorphic sequence markers for resistance of sunflower to downy mildew race 730. Plant Breeding, 126(4): 440
Škorić, D., Jocić, S., Gvozdenović, S. (2006) Dostignuća u oplemenjivanju suncokreta na otpornost prema bolestima, volovodu i insektima. Biljni lekar, vol. 34, br. 4-5, str. 299-313
Vear, F., Philippon, J., Roche, S., Walser, P., de Tourvieille, L.D., Mouzeyar, S., Nicolas, P. (2000) Genetical analyses of the sunflower downy mildew resistance gene Pl5. in: Int. Sunflower Conference, (15), proceedings, 12-15 June, Toulouse, France, Paris: Int. Sunflower Association
 

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article language: Serbian
document type: Original Scientific Paper
published in SCIndeks: 23/04/2009

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