Update on the situation of Curtobacterium flaccumfaciens pv. flaccumfaciens in Russia
In Russia, Curtobacterium flaccumfaciens pv. flaccumfaciens (EPPO A2 List) was previously only recorded on bean (Phaseolus vulgaris) based on disease symptoms from Southern and Far East Russia. The pathogen has recently been first reported causing disease on sunflower (Helianthus annuus) and soybean (Glycine max).
On sunflower, symptoms of bacterial wilt and blight were first observed in summer 2018 in fields near Kursk (Southern Russia), and the incidence of this disease was 5 to 20% in the inspected fields in the following years. The pathogen was also recovered from seeds of infected sunflower plants (Pilik et al., 2022).
On soybean, symptoms of tan spot were first observed in summer 2020 and again in spring 2021 in Stavropol Krai (Southern Russia). During routine surveys of several fields, about 10–40% of soybean plants were observed to have tan spot disease. After harvest in 2021, 48 soybean seed lots collected in different regions of Russia were tested for the presence of C. flaccumfaciens pv. flaccumfaciens. The bacterium was isolated from seed lots produced in Stavropol, Ryazan (Central Russia), and Amur (Far East).
In both case the identity of the pathogen was confirmed by morphological and molecular methods.
Sources
Pilik RI, Tesic S, Ignatov AN, Tarakanov RI, Dorofeeva LV, Lukianova AA, Evseev PV, Dzhalilov FS, Miroshnikov KA (2022) First report of Curtobacterium flaccumfaciens pv. flaccumfaciens causing bacterial wilt and blight on sunflower in Russia. Plant Disease (early view). https://doi.org/10.1094/PDIS-05-22-1203-PDN
Tarakanov RI, Lukianova AA, Pilik RI, Evseev PV, Miroshnikov KA, Dzhalilov FS, Tesic S, Ignatov AN (2022) First report of Curtobacterium flaccumfaciens pv. flaccumfaciens causing bacterial tan spot of soybean in Russia. Plant Disease (early view). https://doi.org/10.1094/PDIS-08-22-1778-PDN