Introduction. Watermelon flesh color is controlled by several genes to produce scarlet red, coral red, orange, salmon yellow, canary yellow, or white. Genes conditioning flesh colors are B, C, i-C, Wf, y, and y-o.Canary yellow (C) is dominant to other colored flesh (c).ntroduction. Watermelon flesh color is controlled by several genes to produce scarlet red, coral red, orange, salmon yellow, canary yellow, or white. Genes conditioning flesh colors are B, C, i-C, Wf, y, and y-o.