Influence of phylloplane colonizing biocontrol agents on the black spot of rose caused by Diplocarpon rosae

Muthusamy Karthikeyan*, Ramanujam Bhaskaran, Subramanian Mathiyazhagan, Rethinasamy Velazhahan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


An attempt was made to study the biocontrol efficacy of antagonistic microorganisms in phylloplane of rose cv. Edward to manage the black spot (Diplocarpon rosae) disease. Eight antagonistic microorganisms were tested in vivo against the black spot pathogen. Among these, Trichoderma viride and Pseudomonas fluorescens pf1 reduces the mycelial growth significantly. These two biocontrol agents were evaluated for their ability to induce defense-related enzymes and chemicals in plants. Increased activity of phenylalanine ammonia lyase (PAL), peroxidase (PO), polyphenoloxidase (PPO) and total phenolics were recorded in all the biocontrol agents treated leaves. P. fluorescens Pf1 recorded early and increased synthesis of the entire defense-related enzymes and total phenol within 6 days. The application of biocontrol agents induced the defense-related enzymes involved in phenyl propanoid pathway in addition to direct antagonism, which collectively contribute for enhanced resistance against invasion of Diplocarpon rosae in rose.

Original languageEnglish
Pages (from-to)225-231
Number of pages7
JournalJournal of Plant Interactions
Issue number4
Publication statusPublished - Dec 2007
Externally publishedYes


  • Biocontrol
  • Black spot
  • Phylloplane
  • Rose

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science


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