induced by C2H4, such as apple and pear scald and russet spotting on lettuce. Chilling injury of some commodities (e.g. avocado, citrus, okra, and peppers) 1982; Risse et al., 1987; Scott and Chaplin, 1978). Other physiological disorders, such as brown stain of lettuce and blackheart of potato, may be induced b inappro priate modified atmospheres (Kader et al., 1988.