Neīstā miltrasa lauka pupu sējumos
2017
Bimsteine, G., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Bankina, B., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture
The sowing area of faba beans (Vicia faba L. var minor) has enlarged in Latvia, and possible losses caused by diseases might increase. The aim of this study was to describe the development of downy mildew (caused by Peronospora viciae). Observations were carried out at the Research and Study farm of the Latvia University of Agriculture. The severity (0–9 point scale) of downy mildew on the leaves was assessed every two weeks after the appearance of symptoms. Obtained data was used in order to calculate the AUDPC (the area under disease progress curve). The first symptoms were observed at the beginning of pod development (BBCH 70–75). The morphology of pathogen’s conidiophores and conidia corresponded to the characteristics of P. viciae. The disease development was not influenced by the sowing rate of faba beans, but the impact of cultivars was significant. The highest development of downy mildew was observed for the cultivar ‘Isabell’ but the lowest – for ‘Laura’. Investigations proved that downy mildew can be a potentially harmful disease under particular conditions.
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