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The impact of spruce spider mite (SSM) (Oligonychus ununguis Jacobi, Acari: Tetranychidae) feed-ng on needle compounds of young dwarf white spruce (Picea glauca ’Conica’), important in defence against pests, was determined. It was shown that the direction and intensity of changes in chemical composition of spruce needles was related to the density of spruce spider mite popu-a-ion. Relative to uninfested...
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