Alternaria sp. is the pathogen which produces the brown spot on sunflower leaves, stems and head. The paper presents the Alternaria species identified on sunflower in a different part in Bulgaria. The Alternaria brown spots on sunflower, in our country is produced by four species: Alternaria helianth (Hansf.), Alternaria zinniae (Pape), Alternaria alternata (Fr.) and Alternaria helianthinficienns (Simmons).
Study on species composition of the fungi from genus Alternaria - cause agents of brown leaf spots in sunflower