
DUS tests are carried out to ensure that a new variety is Distinct from existing varieties, that its characteristics are Uniform, and that the variety is Stable with consistent phenotypic characteristics from one generation to the next.
DUS tests are carried out in accordance with harmonised EU protocols, based on plant material provided by the applicant. A variety description is produced, which is used to identify the variety. This description and plant material can later provide the basis for seed certification and plant variety protection applications.
DUS tests are harmonised at European and international levels, through the CPVO and UPOV respectively. They are conducted in accordance with the CPVO protocol in force. The characteristics studied and the standards of acceptation are specific to the species in question, taking into consideration their genetic structure (pure, hybrid or population lineage) and the method of reproduction (self-pollinated, cross-pollinated).

The DUS test generates a description of the variety detailing its relevant characteristics. For vegetable crops, morphological features and colour are mostly used (leaf shape, fruit colour, etc.) as well as phenological features such as flowering and ripening phases. Varieties are also tested for disease resistance, such as resistance of tomato and pepper varieties to the tomato mosaic virus for tomato and pepper, and resistance of bean varieties to Anthracnose. Similarly, they are tested for their resistance to insects (melon aphids, lettuce aphids, etc.).
GEVES specialises in numerous vegetable species, and is entrusted by Community Plant Variety Office and other examination offices for technical examinations. To evaluate the distinctness of candidate varieties compared to similar existing varieties, GEVES owns extensive collections of well-known reference varieties. It also has extensive databases and software, experimental facilities (fields, greenhouses, conservation chambers) and specialised personnel.