Abstract
The spruce gall aphid ( Adelges Abietis ) is an important enemy of Norway spruce in New York nurseries, and nurserymen often sustain serious economic losses due to the ravages of this insect. There are two generations, both of which occur on spruce. No alternate host appears to be involved. Results of some treatments employed in the control of this insect are included. Applications of miscible oils and Bordeaux lubricating oil emulsions have given good control but have been attended in some cases by injury to the trees, which varied directly with the material and the concentrations used. Likewise, promising results have been secured from the use of lime-sulfur, soaps and nicotine. No injury has been observed following applications of these latter materials.
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