In southern California peaches frequently are not exposed to winter chilling sufficient to break the rest period. The dormant condition of the flower and leaf buds is prolonged and symptoms sometimes known as delayed foliation appear. Flower and leaf bud growth are late and irregular; the fruit ripens irregularly and, in extreme cases, there is little or no crop. The fall and winter temperatures of the buds and twigs are critical. Pruning has a localized growth-stimulating effect and spraying at the proper time with an oil-in-water emulsion containing DNO—dinitro-o-cyclohexyl phenol—or DNC—3-5-dinitro-o-cresol may be helpful.