Abstract
AbstractStrawberry anthracnose was first reported in Bulgaria in 2002, subsequently reaching disease epidemic proportions in production fields from 2004. Isolates of Colletotrichum species from different strawberry cultivars (112), pepper (2), tomato (1), and the weed species Cirsium arvense (1), Abuthilon theophrasti (1) and Rumex obtusifolius (1) growing adjacent to cultivated strawberry fields, were characterized by morphological criteria and by various molecular methods. Morphological characterization defined all the isolates as Colletotrichum acutatum, which was ultimately confirmed by species‐specific polymerase chain reaction (PCR) analysis. No PCR products were amplified using Colletotrichum gloeosporioides specific primers. Arbitrarily primed PCR determined that all the studied isolates, regardless of which plant species they originated from, were uniform indicating that they belong to an asexually reproducing population. Sequence analysis of the complete ITS (ITS 1 – 5.8S – ITS 2) region further identified the pathogen populations as C. acutatum and grouped them within the previously defined subgroup II, ‘Ca‐clonal’, which is uniform. Pathogenicity tests and alternate host infections imply that cross‐inoculation of C. acutatum between strawberry and other susceptible hosts is occurring under field conditions.
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