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Umbel Browning and Stem Necrosis: a New Disease of Fennel in Bulgaria
Author(s) -
Rodeva Rossitza,
Gabler Jutta
Publication year - 2011
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.2010.01728.x
Subject(s) - umbel , pycnidium , biology , apiaceae , browning , conidium , botany , agar , horticulture , genetics , bacteria , cultivar
A new fungal disease on fennel has been observed with increasing frequency in Bulgaria. The main symptoms were expressed as umbel browning and stem necrosis. Umbels could be destroyed completely and produced no fruits. Stem necrosis observed in the second and subsequent years of cultivation caused death of many twigs or whole plants. Pycnidia containing alpha and beta conidia developed on diseased umbels, twigs and stems. Perithecia with mature ascospores were found in vivo on the overwintered plant parts, and in vitro mainly on malt yeast extract agar and oatmeal agar. Diaporthe angelicae (anamorph Phomopsis foeniculi ) was established as the causal agent. Isolates showed great variability in colony colour, linear growth, quantity of pycnidia and ability to produce teleomorph in vitro . Isolates obtained from fennel were able to infect other species belonging to the Apiaceae family, making the disease a potential threat for them, too.