MATREF is a network of reference material managed by GEVES for testing varieties for resistance to pathogens and pests. It was created in 2002 for disease resistance tests performed for registration in the official catalogue (CTPS), for Plant Variety Rights (CPVO or INOV), or for external clients.

In 2017, MATREF contained 193 control varieties and differential hosts, as well as 68 pathogens and pests (in connection with ISF differential host sets).