Instead of the synthetic antibiotics, the antibacterial activity of the aqueous and ethanolic extracts of
both Cinnamon (Cinnamomum spp.) and Siwak (Salvadora persica) plants was evaluated against the
foulbrood bacteria under the laboratory conditions. To the study knowledge, it is the first time to
evaluate Siwak plant against the foulbrood diseases. The major antimicrobial constituents (total
phenolics, flavonoids and tannins) were determined quantitatively in the extracts using the
spectrophotometer technique. The results showed these extracts had significant antibacterial effects
against the selected pathogens, Paenibacillus larvae and Melissococcus plutonius.