Abstract
Identical combined fungicide and insecticide treatments were applied on ‘Belle de Boskoop’, ‘Golden Delicious’, ‘Tydeman's Early Worcester’ and ‘Cox's Orange Pippin’ apples. The free sugars (fructose, glucose, sorbitol, sucrose and their total), and the ascorbic acid contents of the freshly harvested apples and the pH of their juice were measured. Relative to the untreated apples of the same cultivar (control), the fungicide and insecticide treatment had generally positive effects on the biochemical composition and the quality of ‘Belle de Boskoop’, ‘Golden Delicious‘' and ‘Tydeman's Early Worcester’, but had no effect on ‘Cox's Orange Pippin’. These positive effects consisted of an increase in the total free sugar content and, relative to the total content of free sugars, an increase in the percentage of sucrose, as well as an increase in the ascorbic acid content and a decrease in the acidity of the apple juice. The results of the chemical analyses were confirmed by organoleptic evaluations.
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