Evaluation of Weed Diversity and Density in White Cabbage Fields in Sakarya Province of Türkiye: A New Record for Orobanche spp.

Articles in Press
Authors
B. ŞİN 1
O. U. Okcu 2
1 Sakarya University of Applied Sciences. Department of Plant Protection
2 Tekirdag Namık Kemal Univerity, Faculty of Agriculture
Abstract
Weeds significantly influence yield and quality in white cabbage production, which has been a longstanding practice in the Sakarya province. 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 belonging to 27 different plant families. 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 83.75%, 75.11%, and 75.07%, 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. Additionally, Orobanche spp. was identified for the first time in Türkiye as a parasitic weed on white cabbage during the second survey period.

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Journal of Agricultural Science and Technology

Articles in Press, Accepted Manuscript
Available Online from 16 September 2025