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Impact of Pine Leaf Aphid, Pineus pinifoliae (Chermidae) on its Secondary Host, Eastern White Pine1

Published online by Cambridge University Press:  31 May 2012

Robert F. DeBoo ,
John B. Dimond  and
James H. Lowe Jr.
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Abstract

Pine leaf aphid infestation produces not only a general reduction in radial growth of white pine but also a modification of the normal pattern of annual radial increment along the length of the stem. The greatest growth reduction occurs in the lower stem with proportionately less in the midcrown area and least in the top. This appears to reflect the distribution of branch mortality which is greatest in the mid- and lower crown. Several defoliators studied by other workers produce the greatest effect on radial growth and on foliage survival in the tops of the tree.

Stem elongation reduction occurs only after crown damage and aphid infestation becomes extreme. Lighter infestations are reflected, however, in reduced needle length in the year of attack followed by reduced branch elongation in the year following attack. The combination of stunted and normal needles alternating with stunted and normal branch internodes is probably a unique characteristic of pine leaf aphid damage.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 5 , May 1964 , pp. 765 - 772
Copyright
Copyright © Entomological Society of Canada 1964

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