المجلة الدولية للعلوم والتقنية

This study was carried out during the agricultural season of 2022-2023 in department of plant protection at Omer Al-Mukhtar Univ. To estimate the efficiency of water and alcoholic plant extracts (Capparis spinosa and Peganum Harmala) to control the bacteria ( Pectobacterium cartovorium) that causes soft rot of many plants specially onion and comparing them with the antibiotic streptomycin under laboratory conditions, where the disk diffusion method was used in the experiment. The findings revealed that the efficacy of the extracts under study in inducing bacterial inhibition by the percentage of ( 22% and 18%) for alcoholic extract and ( 19% and 15%) for aqueous extract of both tested plants respectively, where the alcoholic extract gave higher inhibition than the aqueous extracts, these findings also revealed substantial variations between their different concentrations, and the effectiveness of these extracts increased with increasing concentrations while the inhibitory effectiveness of the antibiotic reached(26%), as the results showed that Capparis spinosa leaves extract was more effective against bacterial growth than Peganum Harmala. Key words: Plant extracts, Pectobacterium cartovorium, Soft rot.