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Abstract


Weeds Infesting The Vineyards of Tokat Province
Viticulture occupies an imperative place in crop production of Tokat Province due to suitable ecological conditions. Weeds not only significantly reduce in yield and quality of the produce; weed control expenses are also an important part of input costs. This study was aimed at determining the problematic weed species and their densities in the vineyards of Tokat province for contributing towards weed management strategies. Weed surveys were conducted in the spring and autumn seasons of 2010. Surveys were conducted 53 vineyards of Merkez, Erbaa, Niksar, Pazar, Turhal and Zile districts having intensive vineyard cultivation. Sixty seven (67) weeds belonging to 28 families (3 monocotyledons and 25 dicotyledons) and 57 genera were identified during surveys. Most problematic families in the vineyard areas were Asteraceae, Poaceae ve Brassicaceae with 10, 8 and 6 weed species, respectively. There was 19.4% similarity index between weed species of spring and autumn seasons however, dominant species were generally different. Thlapsi arvense L., Lamium amplexicaule L., Senecio vernalis Wald. and Kit. and Stellaria media (L.) Vill were the most dominant species during spring season. Most frequent and dominant species of the autumn surveys were; Convolvulus arvensis L., Tribulus terrestris L., Amaranthus retroflexus L., Xanthium spinosum L., Heliotropium europaeum L., Portulaca oleracea L. and Chenopodium album L. There were significant differences among the surveyed districts for dominant weed species and their densities due to variation in the geographic and climatic conditions. Keeping in view the same weed management practices opted in the region; it is concluded that site specific management strategies are needed

Keywords
Vineyards, weed, Tokat, weed density, weed survey


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