Phytoplasma disease “Bois noir” in Crimea: diagnosis of the pathogen Natalia Girsova, Natalia Aleinikova, Tatyana Kastalyeva, Yana Radionovskaya and Damir Bogoutdinov BIO Web Conf., 25 (2020) 06004 Published online: 01 October 2020 DOI: 10.1051/bioconf/20202506004