De Duurzame Bij is involved in selecting colonies that are naturally tolerant to Varroa. These colonies do contain Varroa mites, but the mites do not hinder colony growth and honey production.
The De Duurzame Bij Foundation was formally established on February 2, 2001 by Ed Pieterse. That same year 12 Primorsky queens with Varroa-tolerant characteristics were imported from the USA and introduced into carnica colonies.
In 2002, we started queen rearing and distributing the offspring of these Primorsky queens. Mating of the young queens occurs on the mating station Neeltje Jans in Zeeland. Here we placed drone colonies with a Primorsky background. Between 2013 and 2015 we tried repeatedly to obtain fresh genetic material, queens, eggs or sperm. Though we finally got the formal documents allowing the import we did not manage to successfully import collected eggs.
As of 2016, De Duurzame Bij works with indigenous Apis mellifera mellifera (AMM) bees. We cooperate with the international SICAMM organisation, beekeepers from Limburg (Belgium) and Jacco van Ree, as representative of beekeepers from the island of Texel, where we obtained our AMM material.