The effects of succinamic acid, 2-2-dimethyl hydrazide (Alar) and controlled late-season night temperatures on maturity indices of the sun-exposed and shaded sides of ‘Stayman’ apples were studied. The inhibitory effects of Alar on maturity were apparently reduced by warmer night temperatures. Warmer nights decreased soluble solids and red color but increased softening and acidity. These effects are attributed to an increased night respiration rate. Maturity indices data suggest that metabolic activities of the sun-exposed and shaded sides of the fruit respond differentially to increases in night temperature.
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Albrigo et al. (1970) studied this question.
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