The Use of Balsam Fir Shoot Elongation for Timing Spruce Budworm Aerial Spray Programs in the Lake States

1 October 1961

journal article
research article
Published by Oxford University Press (OUP) in Journal of Economic Entomology

Vol. 54 (5) , 996-1000
https://doi.org/10.1093/jee/54.5.996

Abstract

Studies in Minnesota in spruce-fir stands heavily depleted by the spruce budworm (Choristoneura fumiferana (Clemens)) have shown that larval development was closely correlated with balsam fir shoot elongation. With this as a basis, a method was developed using balsam fir shoot elongation for timing spruce budworm aerial spray programs in the Lake States. Two methods of calculating total shoot growth for the coming season are presented in this paper.

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