A toothpick inoculation method for evaluating carrot cultivars for resistance to Alternaria radicina

B. M. Pryor, R. M. Davis, R. L. Gilbertson

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1099-1102
Number of pages4
JournalHortScience
Volume35
Issue number6
StatePublished - Jan 1 2000
Externally publishedYes

Keywords

  • Black rot
  • Daucus carota
  • Disease resistance
  • Postharvest disease

ASJC Scopus subject areas

  • Horticulture

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