The Effect of Time of Exposure to Inoculum, Plant Age, Root Development, and Root Wounding on Fusarium Yellows of Celery

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Abstract
Fusarium yellows of celery was more severe as the time of exposure to inoculum of Fusarium oxysporum f. sp. apii in soil was increased from 4 to 14 days. Young, 2 and 4 wk old, plants were more susceptible than were 6 and 8 wk old plants. Root tips were important sites of infection, but wounded roots were not. Experiments in which celery roots were inoculated by the root dip method or the soil infestation method indicated that there was a finite number of susceptible infection sites (apices of young roots) on celery roots at any one time, and that large numbers of infections were required for severe disease development. Subsequent disease severity was not as great after roots were dipped into inoculum as after roots grew through soil infested with the pathogen. There may have been a limited number of infection sites during inoculation with the root dip method and that subsequently formed infection sites were not exposed to the inoculum.

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