Fig. 3From: Key lessons from resistant tree breeding programmes in the Northern HemisphereTimeline indicating prominent events in the Sitka spruce (Picea sitchensis) breeding programme carried out by the British Columbia (B.C.) Ministry of Forests. Numbered references are: 1King and Alfaro (2009). 2Ying (1991). 3Alfaro et al. (2013). 4Alfaro et al. (2008). 5King et al. (2004). 6King et al. (2011). 7Moreira et al. (2012). 8Alfaro and King (2012). 9Heppner and Turner (2006)Back to article page