Ascochyta avenae, Ascochyta tritici and Didymella sp. were identified on oats, wheat and barley leaves collected in 10 localities near Tachov (West-Bohemian region) in the spring of 1984. In our material yellow-and-brown lesions on oats were marginated dark red and contained irregularly dispersed pycnidia of Ascochyta avenae (Petr.) Sprague et Johns, [syn. Pseudodiplodia avenae (Petr.) Petr.]. Pycnidia were sized in average 139.5 x 134.25 µm, pycnospores 24.5 x 6.2 µm, having 1–2 septa. Infected spots of wheat and barley leaves were spindle-shaped, dark brown marginated. Ascochyta tritici Hori et Enjoji identified in wheat had pycnidia 138.5 x 130 µm in average, pycnospores 15.5 x 4.6 µm, normally having one central septum, two or even three septa were rare. In barley perithecia of fungus Didymella sp. were found 128 x 147 µm in average, with asci 55 x 11.5 µm and ascospores 15.5 x 6.2 µm, with one central septum. The above-mentioned fungi were cultivated on maltose-dextrose agar at 20–25°C, for 14 days under UV-light (365 nm).
Hýsek J., Tempírová Z. (1986): The occurrence of Ascochyta Lib. and Didymella Sacc. on the leaves of cereals in Czechoslovakia. – Česká Mykologie 40(2): 86–94.
