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  • Author or Editor: Maria Elena Garcia x
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The level of dihydroxyphenolics as influenced by cultivar and leaf phenology was determined for 10 apple cultivars. Newly unfolding leaves were tagged weekly. Once per month, the leaves were collected and analyzed to determine their phenolic content. Replicated collections were made at three times during the summer. Diphenyl boric acid ethanol was the reagent used in this spectrophotometric technique. The phenolic content changed throughout the season. However, no trend was observed for phenolic content variation with leaf age. Each cultivar varied independently in phenolic content with leaf phenology. There were variations in the phenolic content associated with cultivar. Possible hypotheses as to factors affecting the production of phenolics in apple are discussed.

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