Get this from a library differential susceptibility of 19 white pine species to woolly aphid pineus coloradensis r j hoff g i mcdonald intermountain forest and range experiment station ogden utah united states forest service. Diseases of forest and shade trees of the united states us department of agriculture agriculture handbook 386 washington dc 658 p hoff r j and g i mcdonald 1977 differential susceptibility of 19 white pine species to woolly aphid pineus coloradensis usda forest service research note int 225. Zondag r 1977 pine twig chermes or pine woolly aphid forest and timber insects in new zealand no 25 zwolinski jb 1989 the pine woolly aphid pineus pini l a pest of pine in south africa south african forestry journal no 15152 57 zwolinski jb 1990. Other species of birch aphids produce honeydew which blackens much of the foliage or cause leaves to drop readily when disturbed on scotch austrian and especially white pine an aphid known as the pine bark aphid pineus strobi may cover the trunk and branches in white woolly patches persistent and heavy infestations of this aphid will . Pine woolly aphid hemiptera adelgidae as stress can increase susceptibility applying good forest health practices will help protect forests from infestations or decrease the severity of damage planting more resistant species or provenances may also be effective pineus aphids have been successfully
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