Development of an in vitro protocol to screen Clavibacter michiganensis subsp. michiganensis pathogenicity in different Solanum species Chapter 3 Fine mapping of a Clavibacter michiganensis subsp. michiganensis (Cmm) tolerance gene originating from Solanum arcanum LA2157 Chapter 4 Exploiting the potential use of susceptibility genes against Clavibacter michiganensis subsp. michiganensis symptoms in tomato Chapter 5 Alternative ways to reduce Clavibacter michiganensis subsp.