“…This is the most common stem disease of sunflower in Russia and worldwide (McDonald, 1964;Boerema et al, 1981;Acimovic, 1984;Donald et al, 1987;Maric et al, 1988;Sackston, 1992;Chandreshekar, 1993;Peres, Lefol, 1996;Gulya et al, 1997). In Australia (Chandrashekar, 1993) and China (Wu et al, 2012) the Phoma stem canker causal agent, P. lindquistii, is of quarantine significance. In Russia this fungus is widespread in all sunflower producing regions, such as Krasnodar territory (Borodin, Kotlyarova 2006;Saukova et al, 2014), Tambov province (Vypritskaya et al, 2010), Volgograd province (Saukova et al, 2018), Belgorod province, Central Black Earth region, and North Caucasus (Yakutkin, 2001;2005).…”