Effect of Rosy Apple Aphid and Spirea Aphid (Homoptera: Aphididae) on Dry Matter Accumulation and Carbohydrate Concentration in Young Apple Trees

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Abstract
One-year-old apple trees grown in pots were artificially infested with either Dysaphis plantaginea (Passerini) or Aphis spiraecola Patch Feeding by D. plantaginea on 22-53% of the leaves on the tree significantly reduced accumulation of dry weight in all portions of the trees during the first season’s growth. At the 10-leaf stage of the second season, dry weights of trees infested with D. plantaginea during the previous year were still significantly lower than those of control trees. A. spiraecola did not reduce the accumulation of dry weight by the young trees.