There is limited information about the resistance of onion cultivars to bacterial diseases registered in Poland. Therefore, in the presented work 33 varieties of onion were examined for their susceptibility to infection by Burkholderia cepacia, B. gladioli pv. Alliicola and Pectobacterium carotovorum subsp. carotovorum. It was found that most of the studied cultivars were sensitive to infection by B. cepacia. In the case of P. carotovorum subsp. carotovorum and B. gladioli pv. alliicola the susceptibility of studied cultivars varied. Alonso F1 cultivar showed the highest resistance to bacterial infection.
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