Jerusalem artichoke (Helianthus tuberosus L.) is considered as a weed of natural conservation areas, but it can occur on arable lands and ruderals, also. The aim of our study was to investigate the efficiency of some chemical and mechanical treatments in small plot experiments under field conditions. Experiments were set up on the southwest part of Hungary (Somogy County), heavily infested with H. tuberosus. The stands were mowed before chemical treatments and the plant residues were left on the field. Chemical treatments in four replications were carried out at 30-40 cm plant height of H. tuberosus. Postemergence treatments were done twice: ps1: 3.7.2013; ps2: 5.9.2013. Treatments were the followings: 1. ps1: 63 g/ha foramsulfuron + 40 g/ha thiencarbazone-methyl + 30 g/ha ciprosulfamid; 2. ps1: 800 g/ha 2,4 D + 1600 g/ha glyphosate isopropilamin salt; 3. ps1: 180 g/ha clopyralid; 4. ps1: 2880 g/ha glyphosate isopropilamine salt; 5. ps2: 2880 g/ha glyphosate isopropilamine salt; 6. ps1: 2880 g/ha glyphosate isopropilamine salt + ps2: 2880 g/ha glyphosate isopropilamine salt; 7. ps2: 800 g/ha 2,4 D + 1600 g/ha glyphosate isopropilamine salt; 8. mowing three times; 9. mowing twice; 10. untreated control. The highest dosages permitted for perennial dicots were used. Weed control efficacy was evaluated 12, 22 and 66 days after the first chemical treatments (DAT) and 48 days after the second treatments, respectively. The air-dry weight of underground plant parts (including roots, stolons and tubers also) was measured on 23. 10. 2013 (17 weeks after the first postemergence treatments). It can be concluded that pos-temergence treatments

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