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B658: Susceptibility And Vulnerability Of Forests To The Pine Leaf Aphid Pineus Pinilolile (Fitch) (Adelgidae), John B. Dimond, Robert H. Bishop

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In the late 1950s, early 1960s, Maine and surrounding regions experienced an outbreak of the pine leaf aphid (or adelgid). The population progression began about 1955, as indicated by tree growth reductions (2), a peak was reached about 1961, after which populations gradually regressed through the late 1960s. As a result of the outbreak, there was considerable growth reduction of white pine in some regions and scattered tree mortality. Among the many observations on the insect made during the outbreak were (a) the aphid was abundant in only certain portions of Maine and remained uncommon in the remainder of the …