Helia · 2000 · 14 citations · 1 references
AgriculturePlant BiologyPlant SciencesMycologyPlant Disease DiagnosisSeed PathologyFoliar DiseasesPathogen IsolationPlant PathogenesisPlant-pathogen InteractionsPlant-pathogenic FungiSeed-borne DiseasesDowny Mildew PathogenesisInoculationPathogen Virulence TestingPathogen-plant InteractionsPlant Disease SymptomsPlant Fungal DiseaseRust FormationVirulence Variation
SUMMARY In 1998, a number of Ambrosia artemisifolia individuals located in the vicinity of a sunflower breeding nursery at Bicserd, south Hungary, showed disease symptoms resembling downy mildew and/or white rust. Sporangia of both Plasmopara and Albugo have been isolated from the affected plants. Microscopical observations and subsequent inoculation experiments revealed the existence of Plasmopara halstedii on the affected A.artemisifolia plants. Following inoculations on a set of sunflower differentials, the Ambrosia isolates of P.halstedii consistently showed a virulence formula of 730 that is equal to pathotype 4.
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