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The susceptibility of 46 carrot cultivars to infection by  Alternaria radicina  Meier, Drechsler, and Eddy, causal agent of black rot disease, was evaluated in field trials with a toothpick inoculation method. Toothpicks infested with  A. radicina  were inserted into the shoulders of 10- to 12-week-old carrots ( Daucus carota  L.) and lesion areas were measured 9 to 10 weeks later. There were significant differences in lesion size among cultivars. Relatively resistant cultivars included `Panther' and `Caro-pak', and susceptible cultivars included `Royal Chantenay' and `Nogales'. Nine of the cultivars were inoculated with  A. radicina -infested toothpicks and maintained in cold-storage for 10 weeks. Lesion development was greater in cold-storage than in the field, but the relative ranking of cultivars in terms of resistance to  A. radicina  was similar.

A Toothpick Inoculation Method for Evaluating Carrot Cultivars for Resistance to Alternaria radicina