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¹ Zirai Mücadele Araştırma Enstitüsü Müdürlüğü, İzmir DOI : 10.16882/derim.2020.629418 Viewed : 2029 - Downloaded : 889 In the study, weed species, densities and frequency of thyme (Origanum onites L.) located in the production areas in Manisa Province were investigated. Surveys; It was carried out in two different periods in 705 decare area in 21 fields randomly selected in 2013. In weed counts, 1/4 m-2 frames were thrown according to the size of the field and counts of weeds were made on the basis of species. From the data obtained, weed density and frequency of occurrence in m-2 were determined. As a result of the surveys, 50 different weed species belonging to 26 families were identified. Among these species, it was determined that two of them are parasite (Cuscuta campestris L., Orabanche gracilis sm.) Species, four of them are narrow-leaved, others are broad-leaved weed species. It has been determined that among the broad-leaved weeds, the most intense one is Convolvulus arvensis L. (1.15 plant m^-2) and it is followed consecutively by Lactuca serriola L. (1.03 plant m^-2), Lactuca saligna (0.75 plant m^-2), Soncus asper (0.62 plant m^-2), Portulaca oleracea L. (0.58 plant m^-2); In narrow leaf weeds, the most intense one is Cyperus rotundus L. (2.67 plant m^-2) and it is followed consecutively by Cynedon dactylon L. (0.39 plant m^-2) and Sorghum halapense L. (0.13 plant m-2). On the other hand, C. arvensis (99%), L. serriola (63%), C. rotundus (49%), S. asper (36%) were among the most common weeds. Keywords : Thyme; Weed; Density; Frequency