Screening for antibacterial activity in selected medicinal plant extracts against Xanthomonas euvesicatoria

Abstract

Background and objectives: The environment and human health have fared
badly from the use of synthetic pesticides as a form of pest control. Plants are
considered as an alternate pesticide for pest control without sacrificing the
environment and their potency on pests.
Methods: Aqueous extracts of (Lavender flower, olive leaves, thuja leaves and
fruit, fig milk, clove flower buds, Arabic gum, Borage, Tarragon, Cress seed and
Carob tree) were tested against newly isolated Xanthomonas euvesicatoria (Acc.
No. OP115671) from symptomatic tomato plants.
Results: The in vitro results showed that clove extract is highly effective in
inhibiting bacterium growth followed by borage, carob and tarragon respectively.
The minimum inhibitory concentration MIC and the minimum bactericidal
concentration MBC of clove extract reached 3.125 and 6.25 mg/ml respectively.
Conclusions: This study indicated that aqueous extract of clove can potentially be
used as a promising bactericide in the near future.