Fig. 4From: Key lessons from resistant tree breeding programmes in the Northern HemisphereTimeline indicating prominent events in the elm (Ulnus spp.) breeding programme carried out by the Italian Institute of Plant Protection (IPP). Numbered references are: 1Mittempergher and Santini (2004). 2Santini et al. (2002). 3Santini et al. (2007). 4Santini et al. (2011). 5Santini et al. (2012). 6Brookes (2010). 7Santini et al. (2010). 8Brookes (2014)Back to article page