Effect of Aphid Infestation on Properties of Grand Fir

Aphid-infested wood of grand fir is shown to have the properties of compression wood. Thus a prolonged, widespread aphid infestation would be detrimental to the quality of wood produced in an area, particularly on stems approaching merchantable size. Wood formed during aphid colonization showed wider rings, greater percentage of latewood, shorter tracheid, greater fibril angle, higher, specific gravity, reduced modulus of elasticity, and greater longitudinal shrinkage than would be expected in the absence of aphid attack. The study material consisted of nine 48-inch-long logs from aphid-infested trees and nine logs from noninfested trees in a stand near Junction City, Oregon.

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