Downy Mildew of Rudbeckia fulgida cv. Goldsturm by Plasmopara halstedii in Virginia
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چکیده
منابع مشابه
Components of Quantitative Resistance to Downy Mildew (plasmopara Halstedii) in Sunflower (helianthus Annuus)
Components of quantitative resistance in sunflower (Helianthus annuus) to Plasmopara halstedii, the pathogen causing downy mildew, were investigated. Percentage infection, latent period, sporulation density and reduction of hypocotyl length were compared on two sunflower lines showing different levels of quantitative resistance in the field infected with different P. halstedii strains of races ...
متن کاملImpact of major gene resistance management for sunflower on fitness of Plasmopara halstedii \(downy mildew\) populations
1 Inra-UBP, UMR 1095, 234, avenue du Brézet, 63100 Clermont-Ferrand, France 2 Inra-CNRS, UMR 441, BP 52627, 31326 Castanet-Tolosan, France 3 Inra-UBP, UMR 1095, 24, avenue des Landais, 63177 Clermont-Ferrand, France 4 CETIOM, ENSAT, 18 Chemin de Borde-Rouge, BP 32607 31326 Auzeville-Tolosane France 5 Inra, UMR santé végétale (Inra-Enita), centre de recherches de Bordeaux, la Grande Ferrade, BP ...
متن کاملMolecular variability of sunflower downy mildew, Plasmopara halstedii, from different continents.
Downy mildew of sunflower (Helianthus annuus L.), caused by the pathogen Plasmopara halstedii, is a potentially devastating disease. Seventy-seven isolates of P. halstedii collected in twelve countries from four continents were investigated for RAPD polymorphism with 21 primers. The study led to a binary matrix, which was subjected to various complementary analyses. This is the first report on ...
متن کاملInter-isolate variation for virulence in Plasmopara halstedii (sunflower downy mildew) from Hungary
A total of 82 isolates of Plasmopara halstedii, collected from all production areas of Hungary between 1976 and 1993, were assessed for their virulence pattern on a standard set of sunfiower differentials under glasshouse conditions. The isolates were classified into six pathogenic races each representing a particular virulence phenotyjje. From 1976 until 1988 all the isolates were found to be ...
متن کاملidentification of physiological races of plasmopara halstedii, the causal agent of sunflower downy mildew, in urmia
sunflower downy mildew, caused by plasmopara halstedii, is one of the most important diseases of this crop in west-azarbaijan, urmia. it causes economic yield losses during favorable environmental conditions. the pathogen is a polycyclic one, and it is likely that physiological changes occur in its population and subsequent appearance of new physiological races. hence, identification of the exi...
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ژورنال
عنوان ژورنال: Plant Disease
سال: 2006
ISSN: 0191-2917,1943-7692
DOI: 10.1094/pd-90-1461b