Abstract
This study was aimed to determine the qualitative and quantitative phenolic compounds. Results revealed that HPLC analysis identified Hydroxy derivatives of benzoic acids, hydroxy-cinnamic acids, in addition to flavonoids. The major compounds detected in clove were eugenol 32.5 mg/L, while in thyme the predominant phenol was gallic acid 35.9 mg/L. Quercetin was the greatest phenolic compound in both eucalyptus and sage 49.8 and 55.6 mg/L, respectively. Clove extract inhibited all selected pathogens entirely when applied at 20%. Subsequently, thyme extract at the same concentration inhibited the growth of B. cinerea completely. Eucalyptus extract revealed a lowest inhibition with 23.2%, 11.83%, and 7.83% after three, six, and nine days, respectively. P. griseofulvum showed remarkable susceptibility to extracts due to 51.99% growth inhibition followed by 25.33% and 20.67% for both A. alternata and B. cinerea, respectively.
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