Occurrence of potato tuber diseases depending on variety | Kartupeļu bumbuļu slimību sastopamība atkarībā no šķirnes
2018
Simtniece, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Bimsteine, G., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Rutenberga-Ava, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology
The number of potato varieties in Latvia’s market is very extensive, and the choice of the growers depends on potato production target. The quality of tubers is the priority for table potato varieties, as well as for different kinds of processing (e. g., potato crisps and starch). Common potato tuber diseases in Latvia are common scab caused by bacteria Streptomyces scabies, black scab caused by Rhizoctonia solani, black dot caused by Colletotrichum coccodes, and silver scab caused by Helminthosporium solani. The aim of this research was to detect the occurrence of potato tuber diseases depending of variety. Tubers from 35 different potato varieties were collected from the reference field of “Latfood Agro” Ltd in October 2017, and were analysed after a three-month storage. The incidence and severity of tuber diseases were calculated. Common scab, black dot, and silver scab were dominant tuber diseases. The incidence varied from 0 to 100% depending on diseases and varieties. The severity of common scab for three varieties – ‘Carolus’, ‘Madeleine’, and ‘Agria’ – exceeded 3 points, which means that 5.1–10% of the surface of potato tubers exhibited disease symptoms. The severity of black dot and silver scab did not exceed 2 points. Black scab was observed only in some cases. Powdery scab caused by Spongospora subterranea was observed for two varieties: ‘Blue Congo’ and ‘Rotte Emalie’.
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