Determination of weed species, problem in outdoor ornamental plant production areas in Sakarya province

Weeds cause problems such as decreasing plant development and quality and increasing costs in ornamental plants production areas. This study was carried out between 2017-2018 in order to determine the prevalence and densities of weed species found in outdoor ornamental plants growing in Sakarya province.In survey expeditions, 92 weed species were identified in outdoor ornamental plant production gardens and 122 in pot production areas. Among the mentioned weed species, 21 species in the production gardens and 13 species in the potted production areas were accepted as the dominant species due to their widespread and abundance. Weed species and density values which are dominant in both production gardens and potted production areas are as follows; Echinochloa crus-galli (L.) P. B. (Barnyard grass, 104.00% -93.00%), Cynodon dactylon (L.) Pers. (Bermuda grass, 70.62% - 69.41%), Euphorbia peplus L. (Spurge, 54,08% - 60,41%), ), Equisetum arvense L. (Horsetail, 53,15% - 54,03%), ), Anagallis foemina Miller (Poorman's weatherglass, 52,15% - 59%, 00) and Conyza canadensis L. (Canada horseweed, 50.69% - 52.45%) species.In the survey studies, it was understood that producers used hoeing, plowing and hand picking methods in addition to herbicides in the fight against weeds. Considering the applications in the literature, it is thought that the use of more than one methods such as sanitation, mulching and cover products at the same time as well as traditional methods in weed management will be necessary in terms of both efficiency and cost control.