Plant Protect. Sci., 2022, 58(1):76-80 | DOI: 10.17221/85/2021-PPS

The first report of Plasmopara halstedii race 337 in the Russian FederationShort Communication

Maria Iwebor ORCID...*, Tatiana Antonova ORCID..., Nina Araslanova ORCID..., Svetlana Saukova ORCID..., Yulia Pitinova, Ksenia Eliseeva, Aleksey Belorutskiy
V.S. Pustovoit All-Russian Research Institute of Oil Crops, Krasnodar, Russian Federation

Sunflower downy mildew caused by Plasmopara halstedii (Farl.) Berl. et de Toni is a destructive and widespread disease. More than 50 races of P. halstedii have been recorded worldwide. In 2020, in the Russian Federation (Zernogradsky district, Rostov region), a globally new race 337 was identified for the first time. The pathogen was identified on the plants of a foreign sunflower hybrid bearing the resistance gene Pl6. According to the five-digit racial nomenclature, its virulence profile was determined as 337 53. It is the first P. halstedii race recorded in the Russian Federation that simultaneously infects all differential lines of the 3rd triplet, i.e., HA-R4, HA-R5 and HA-335. The sunflower lines RHA-274, 803-1, PSC8, RHA-419 and RHA-340 were resistant to it. All the collected isolates of the new race were susceptible to the fungicide mefenoxam.

Keywords: Helianthus annuus; mefenoxam; oomycete; resistance; sunflower downy mildew; virulence

Published: December 17, 2021  Show citation

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Iwebor M, Antonova T, Araslanova N, Saukova S, Pitinova Y, Eliseeva K, Belorutskiy A. The first report of Plasmopara halstedii race 337 in the Russian Federation. Plant Protect. Sci. 2022;58(1):76-80. doi: 10.17221/85/2021-PPS.
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