Isolation of Erwinia chrysanthemi (rhizome rot bacteria) from infected rhizome of banana plants in Twentay Township, Yangon Region was conducted in Microbiology Laboratory, Department of Botany, University of Yangon. Antibacterial activity on Erwinia chrysanthemi from the nine selected plant species and the four chemical bactericides were evaluated by paper disc diffusion methods. The solvent extracts of the eight plant samples: Capsicum annuum L., Curcuma longa L., Languas galangal (L.) Stuntz, Nicotiana tobacum L., Piper nigrum L., Synzygium aromaticum (L.) Merr. Perry, Zingiber barbatum Wall. and Zingiber officinale Rose indicated bioactivity on E. chrysanthemi. However, the extracts of Piper betel L. did not show antibacterial activity on E. chrysanthemi. Chemical bactericides: Agri-mycin 17, Ariston, Bio-save and Blocker 4E showed the weak activity on E. chrysanthemi.
Antibacterial activity; Erwinia chrysanthemi; chemical bactericides; Plant extracts
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