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Studies on the resistance of spruce to the gall aphid Sacchiphantes abietis (L.)


, : Studies on the resistance of spruce to the gall aphid Sacchiphantes abietis (L.). Zeitschrift fur Angewandte Entomologie 71(3): 225-249

Further field and laboratory studies are reported on the resistance of spruce in West Germany to attack by Adelges (Sacchiphantes) abietis (L.). Preliminary observations confirmed that all trees were readily attacked by alatae, that oviposition took place, and that the nymphal pseudofundatrices settled. In the laboratory, artificially or naturally infested buds, collected from study trees in three forest areas, were cut open or sectioned and examined microscopically.

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