Upright dieback, caused by Phomopsis vaccinii Shear (teleomorph Diaporthe vaccinii Shear), is an economically important disease that could threaten blueberry and cranberry production. Diagnosis of the disease by traditional phytopathological methods is difficult. We report the successful detection of P. vaccinii by direct tissue blot immunoassay (DTBIA) and plate-trapped antigen enzyme-linked immunosorbent assay (PTA-ELISA). The infected samples obtained from Lithuania are the findings reported on the fungus in Europe.U. S.
Downy mildew of summer savory (Satureja hortensis), which causes a potentially devastating disease, has been sporadically observed in Germany since 1913. After severe outbreaks in German summer savory fields in 2004, 2006, and 2009, questions arose about the identity of the downy
mildew that is the causal agent of the disease since recent research has suggested that many species of Peronosporaceae are narrowly host specific and the application of broad species concepts is inappropriate. ITS rDNA sequence-based phylogenies support this pathogen as a distinct
species in Peronospora closely related to P. belbahrii and P. salviae-officinalis, recently described from lamiaceous hosts. A careful comparison with downy mildew species described from Satureja hortensis and allied Lamiaceae resulted in the identification
of the etiological agent of downy mildew of summer savory as P. saturejae-hortensis, confirmed by a re-examination of topotype material. A pathogenicity test has confirmed the pathogenicity of P. saturejae-hortensis on summer savory.
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.
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