the above data indicate that the off-flavor development in frozen berries can be attributed to the breakdown of the cells by freezing, thereby decreasing the pH in the cytosol, which in turn leads to the emanation of sulfide ion as H$3. Furthermore, its production depends on the concentration of sulfide ion in the berries. It is therefore advisable, when freezing strawberries, to avoid the use of cultivars with high concentrations of the sulfide ion. It is also recommendable that only cultivar of strawberry low in sulfide be grown