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  • Author or Editor: G.W. Felton x
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The foliar phenolic content of 21 apple cultivars was evaluated. Ten leaves were sampled randomly from three positions on current-season terminal shoots. Shoots were divided as tip, middle, and basal positions. The phenolic content was determined by spectrophotometric method (390 nm) using diphenylboric acid 2-aminoethyl ester as the reagent and caffeic acid as standard. Cultivars varied significantly in phenolic content. `Stark Ultra Red' had the highest amount, and `Liberty' had the lowest amount. Significant variations in the phenolic content due to leaf position were observed. Phenolic content was highest in leaves from the tip position, and it decreased toward the basal portion of the shoot. Factors affecting the phenolic content of apple cultivars will be investigated to determine apple × insect interactions.

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