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¹ Tarla Bitkileri Merkez Araştırma Enstitüsü, Ankara DOI : 10.21566/tarbitderg.280347 - Weed is one of the most important factors limiting yield and production of lentil. Many years, weed causes yield losses up to 100%. Especially in Central Anatolia Region, weed is the most important constraint of the winter crop lentil production. In the World, lentil was developed to the diversity of resistant toImidazolinone (IMI) group herbicide and presented to farmer for use recently. The aim of this study is to determine the resistance to IMI group herbicides of developed lentil lines by Central Research Institute for Field Crops (CRIFC). Experiments were conducted for two years; first year (2014) in green house condition and second year ( 2014/15 cropping season) in field condition respectively. In experiment 759 lines were tested. In 2014, Herbicide with active agent 40 g/LT imazomax SL was sprayed on lentil genotypes of grown in green house. As a result of evaluation and observation, 36 winter type red lentil lines were selected. Selected winter red lines were planted in 2014/2015 cropping season with split plot experimental design and three replication. Standart doze and three times of normal doze herbicide were used in addition to control in Haymana. As a result of this study No. 35 line were identified as tolerant to herbicide. Keywords : Imidazolinone (IMI), herbicide, lentil, tolerance, weed