Tarbiat Modares University Journal of Agricultural Science and Technology 1680-7073 28 5 2026 09 01 Evaluation of Weed Diversity and Density in White Cabbage Fields in Sakarya Province of Turkey: A New Record for Orobanche spp. 1171 1184 24118 10.48311/jast.2026.24118 EN Bahadır ŞİN Department of Plant Protection, Faculty of Agriculture, Sakarya University of Applied Sciences, Sakarya, Türkiye. 0000-0002-0109-3662 Omer Umit Okcu Department of Plant Protection, Faculty of Agriculture, Tekirdağ Namık Kemal University, Tekirdağ, Türkiye. Journal Article 2025 09 16 In 2022–2023, weed surveys were conducted across 73 randomly selected fields in the districts of Adapazarı, Erenler, Kaynarca, and Pamukova, ensuring coverage of at least 1% of the total cabbage cultivation area. These surveys identified 71 weed species. Among the weeds present, Stellaria media (L.) Vill. and Veronica hederifolia L. were the most dominant in both survey periods. In the first period, Capsella bursa-pastoris (L.) Medik. showed the highest density (5.3907), followed by Sonchus oleraceus L., Stellaria media (L.) Vill., and Veronica hederifolia L., all with 100% frequency of occurrence. In the second period, Stellaria media had a density of 39.17, while Veronica hederifolia had 8.50. Regarding frequency of occurrence, Portulaca oleracea L., Convolvulus arvensis L., and Sonchus oleraceus L. were the most frequent species, with 83.7, 75.1, and 75.0 %, respectively. The study concluded that Lamium amplexicaule L. was the most abundant species (in terms of density) in the first period, while Veronica hederifolia L. was the most abundant in the second. However, species dominance varied depending on observation time and whether frequency or density was considered. For the first time in Turkey , Orobanche spp. was identified as a parasitic weed on white cabbage during the second survey period.

https://jast.modares.ac.ir/article_24118_bd8e6f05d9555af5d945c647a70995f1.pdf