Reducing Trunk Malformation Caused by Injury to Eastern White Pine by the White Pine Weevil
The value of eastern white pine (Pinus strobus) is often materially reduced because of trunk deformity resulting from attack of the white pine weevil which kills the terminal leader and causes a lateral branch (sometimes more than one) to assume the terminal position, producing a crook in the stem, and in some cases multiple stems. Purpose of this study was (1) to determine the extent to which subsequent trunk malformation is reduced by deliberately selecting the branch that will become the terminal shoot, removing all other competing laterals at that node, and (2) to investigate some factors involved. Weevil injury was simulated by excising the terminal leader on 120 sapling trees; all laterals but one in the top whorl were removed from certain trees; others were left untreated. Treatments were undertaken in May, June, and July. Recovery was consistently better on treated than untreated trees, greater and more rapid for early than late dates of treatment. On untreated trees, the successful competing lateral was one of the largest with its base in the upper part of the whorl. On treated trees, effect of branch size and position was less evident but data suggest that the lateral selected for retention should be of average size or smaller.
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Document Type: Journal Article
Affiliations: Head of the Department of Forestry and Wildlife Management, University of Massachusetts, Amherst
Publication date: 1963-05-01
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