Several studies have been published on gray mold resistance in lettuce including recent work by Matheron and Porchas, which found variation among several commercial cultivars.  With more resources available from the recent genomic characterization of lettuce germplasm, it is expected that breeding efforts will expand.  Recent work exploring gray mold resistance in wild relatives of lettuce has revealed several accessions with complete resistance.  These accessions are strong candidates for inclusion into ongoing lettuce breeding programs.