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Distribution and race composition of downy mildew (Plasmopara halstedii (Farl.) Berl. and de Toni) in Bulgaria



Distribution and race composition of downy mildew (Plasmopara halstedii (Farl.) Berl. and de Toni) in Bulgaria



Helia 23(33): 25-32



Downy mildew caused by the fungus P. halstedii is the main disease on sunflower in Bulgaria. In recent years a number of authors have reported the occurrence of new more virulent races of the pathogen. According to other authors these races demonstrate resistance to the fungicides used up to now. This fact is rather alarming and imposes the necessity of annual researches with the aim of following the changes in the downy mildew race variability.

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Accession: 003408964

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