Digital image analysis to measure lesion area of cucumber anthracnose by Colletotrichum orbiculare

Min Sun Kwack, Eui Nam Kim, Hojoung Lee, Jin Won Kim, Se Chul Chun, Ki Deok Kim

Research output: Contribution to journalArticle

26 Citations (Scopus)


A method was developed using scanned computer images and software programs to measure the lesion area on leaves with cucumber anthracnose caused by Colletotrichum orbiculare. After cucumber plants were inoculated with various concentrations of conidia, lesions on diseased leaves were scanned, manipulated with Adobe Photoshop 6.0, and measured using the blob analysis feature in Matrox Inspector 2.2. The method requires relatively low-cost equipment including a scanner, a personal computer, and two programs: Adobe Photoshop 6.0 and Matrox Inspector 2.2. Because stored images are used, the lesion area can be measured as time permits. Processing the images requires about 3min per sample. The image assessment accurately detected anthracnose lesions on cucumber leaves and could be applied to other foliar necrotic or spot diseases.

Original languageEnglish
Pages (from-to)418-421
Number of pages4
JournalJournal of General Plant Pathology
Issue number6
Publication statusPublished - 2005 Dec 1



  • Anthracnose
  • Colletotrichum orbiculare
  • Disease quantification
  • Image analysis
  • Lesion area

ASJC Scopus subject areas

  • Plant Science

Cite this