Abstract
Studies of the seasonal biology of the balsam woolly aphid, Chermes piceae Ratzeburg (Adelgidae: Homoptera), were carried out in 1960 following discovery of a severe infestation of this insect on Mt. Mitchell. Observations of aphid development were made in the field on 3- by 3-inch plots of bark on living trees. In addition, microscopic counts of aphids on bark samples were made at frequent intervals in the laboratory. Observations within the plots revealed as many as three generations per year. Data obtained from bark samples showed that most of the aphid population completed two generations.
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