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Plasmopara halstedii (downy mildew of sunflower )
Plasmopara halstedii
downy mildew of sunflower
Plasmopara helianthi, Plasmopara helianthi f. sp. helianthi
Worldwide
Widespread
2021-04-29
fungus
Korea
sunflower, other Asteraceare species.
PLASHA
This pathogen has been reported in Korea
1 Known Hosts
Helianthus annuus
sunflower
Yes
PLASHA-2, PLASHA-3, PLASHA-4
Seed as a pathway has been established and accepted.
Yes
Blotter incubation, ELISA, PCR
It is difficult to detect P. halstedii from sunflower seeds and the commercial usefulness of the tests has not yet been proved. Testing methods have not been standardized or validated.
PLASHA-1
Fungicidal seed treatments.
Resistant varieties for various races exist. Seed treatments with meta-laxyl and mefenoxam (FRAC 4 fungicides) have been effective.
PLASHA-1, PLASHA-2
PLASHA-2
R. M. Harveson, S. G. Markell, C. C. Block, and T. J. Gulya. 2016. Compendium of Sunflower Diseases and Pests. APS Press, St. Paul, MN, USA
PLASHA-3
Doken MT, 1989. Plasmopara halstedii (Farl.) Berl. et de Toni in sunflower seeds and the role of infected seeds in producing plants with systemic symptoms. Journal of Phytopathology, 124:23-26
PLASHA-4
Cohen Y; Sackson WE, 1974. Seed infection and latent infection of sunflowers by Plasmopara halstedii. Canadian Journal of Botany, 52:231-238.
PLASHA-1
Plasmopara halstedi. In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
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