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Occurrence and population density of Fusarium oxysporum f. sp. cepae and its harmfulness for onion were the purpose of our studies. Mycological analysis was performed on 91 onion bulbs with basal rot symptoms that were collected from 9 farms, was done. Independently to onion source in each farm Fusarium basal rot caused by F. oxysporum f. sp. cepae (Foc) was noticed. Using of rhododendron leaves as baits, Foc was detected from onion soil samples taken from 19 farms with different pathogen population. Isolate of Foc caused rotting of onion leaves, roots and bulb scales. In greenhouse trial, symptoms of discoloration of leaves and bulbs were observed on at least 50% of plants growing 9 weeks in substratum infested with Foc.

Occurrence of Fusarium basal rot of onion (Allium cepa) in selected horticultural farms in Poland and evaluation of disease harmfulness