Abstract

A method is described in which the recovery ofCorynebacterium sepedonicum from heel ends of suspected latently infected potatoes is improved by modified extraction and concentration steps. Detection ofC. sepedonicum with the help of indirect immunofluorescence microscopy (IF) is compared with the eggplant challenge test; the use of IF for routine surveys for latent ringrot infection is considered preferable providing that potato extracts are submitted to the eggplant test when IF tests are in doubt.

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