Plant extracts can have powerful antibacterial activity and may be used as biological control against important plant pathogens. This study assessed effect of extracts of Cymbopogon citratus, Eucalyptus camaldulensis and Mentha piperita against two pathovars of Xanthomonas oryzae attacking rice. Both in vitro and in vivo approaches were used for different strains of X. oryzae originating from Burkina Faso. The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method), but, EO from C. citratus at 1:5 dilution (v/v) resulted in the highest inhibition (over 30 mm of inhibition zone) against X. oryzae pv. oryzae and X. oryzae pv. oryzicola. However, they reduced significantly rice seed germination and induced herbicide effects on rice leaves. On the other hand, aqueous extracts from C. citratus stimulated bacterial growth, while extracts from E. camaldulensis had an inhibitory effect (28 mm of inhibition zone at 3:10 dilution, w/v). Therefore, the characterization of active compounds will determine one or more compound(s) involved in the antibacterial activity.
Key words: Xanthomonas oryzae, rice, plant extracts, antibacterial activity.
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