The carrot industry has identified the need for maintaining the use of linuron for grass and broadleaved weed control for domestic and export markets. When applied for weed control in long season carrots, the withholding period of 10 weeks is acceptable. The short season carrot varieties are important to domestic and export markets but cannot utilise the benefits of linuron as the season is shorter than 10 weeks. The project conducted a total of 8 residue trials from 2008 to 2010, in specified regions throughout Australia on heavy and light soil types, domestic, baby and export carrots and for crops with different sowing timings, to determine if the withholding period can be reduced to more acceptable levels.