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The role of fatty acids and soaps in aphid control on conifers.

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Covassi, M., Binazzi, A., (1981). Redia 64, 303-330. Italian language

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Gaumont, R., (1978). Revue Forestiere Francaise 30(1), 21-36. French language

Control of eastern spruce and Cooley spruce gall aphids with soil-applied systemic insecticides.

Nielsen, D. G., Balderston, C. P., (1977). Journal of Economic Entomology 70(2), 205-208. English language

The origin of anholocyclic, parthenogenetic species of Adelgidae on the basis of a study of life-cycle forms and their cytology.

Steffan, A. W., (1970). Zeitschrift fur Angewandte Entomologie 65(4), 444-52. Paul Parey, Berlin, Germany. German language

Observations on the flight periods of aphids in a Sitka spruce plantation in north-eastern Scotland.

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Observations on Forest Pathology in Great Britain and Denmark.

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